diff --git a/.github/workflows/backend-cicd.yml b/.github/workflows/backend-cicd.yml
index 22c0a10..c9dcfd8 100644
--- a/.github/workflows/backend-cicd.yml
+++ b/.github/workflows/backend-cicd.yml
@@ -37,7 +37,11 @@ jobs:
       - name: Install Dependencies
         run: npm ci --loglevel=error --no-audit --no-fund
 
-      # Step 4: Run unit tests and generate a coverage report
+      # Step 4: Run ESLint to ensure code quality
+      - name: Run Lint
+        run: npm run lint
+
+      # Step 5: Run unit tests and generate a coverage report
       - name: Run Tests with Coverage
         run: npm run test:coverage
         env:
diff --git a/eslint.config.js b/eslint.config.js
index 30942f7..d56f67d 100644
--- a/eslint.config.js
+++ b/eslint.config.js
@@ -3,7 +3,9 @@ import globals from "globals";
 import { defineConfig } from "eslint/config";
 
 export default defineConfig([
-  { files: ["**/*.{js,mjs,cjs}"], plugins: { js }, extends: ["js/recommended"], languageOptions: { globals: { ...globals.browser, ...globals.node } } },
+  // Global ignores for auto-generated and third-party code
+  { ignores: ["node_modules/**", "coverage/**"] },
+  { files: ["**/*.{js,mjs,cjs}"], plugins: { js }, extends: ["js/recommended"], languageOptions: { globals: { ...globals.node } } },
   {
     // Tests need Jest/Mocha globals and Node globals (process, __dirname, etc.)
     files: ["tests/**/*.{js,mjs,cjs}", "**/*.test.{js,mjs,cjs}"],
diff --git a/package-lock.json b/package-lock.json
index 98c6003..ae760a2 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -29,7 +29,7 @@
         "jest": "^29.7.0",
         "mongodb-memory-server": "^10.3.0",
         "nodemon": "^3.0.1",
-        "supertest": "^6.3.3"
+        "supertest": "^7.1.0"
       },
       "engines": {
         "node": ">=18"
@@ -91,41 +91,6 @@
         "url": "https://opencollective.com/babel"
       }
     },
-    "node_modules/@babel/core/node_modules/debug": {
-      "version": "4.4.3",
-      "resolved": "https://registry.npmjs.org/debug/-/debug-4.4.3.tgz",
-      "integrity": "sha512-RGwwWnwQvkVfavKVt22FGLw+xYSdzARwm0ru6DhTVA3umU5hZc28V3kO4stgYryrTlLpuvgI9GiijltAjNbcqA==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "ms": "^2.1.3"
-      },
-      "engines": {
-        "node": ">=6.0"
-      },
-      "peerDependenciesMeta": {
-        "supports-color": {
-          "optional": true
-        }
-      }
-    },
-    "node_modules/@babel/core/node_modules/ms": {
-      "version": "2.1.3",
-      "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.3.tgz",
-      "integrity": "sha512-6FlzubTLZG3J2a/NVCAleEhjzq5oxgHyaCU9yYXvcLsvoVaHJq/s5xXI6/XXP6tz7R9xAOtHnSO/tXtF3WRTlA==",
-      "dev": true,
-      "license": "MIT"
-    },
-    "node_modules/@babel/core/node_modules/semver": {
-      "version": "6.3.1",
-      "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.1.tgz",
-      "integrity": "sha512-BR7VvDCVHO+q2xBEWskxS6DJE1qRnb7DxzUrogb71CWoSficBxYsiAGd+Kl0mmq/MprG9yArRkyrQxTO6XjMzA==",
-      "dev": true,
-      "license": "ISC",
-      "bin": {
-        "semver": "bin/semver.js"
-      }
-    },
     "node_modules/@babel/generator": {
       "version": "7.28.5",
       "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.28.5.tgz",
@@ -160,16 +125,6 @@
         "node": ">=6.9.0"
       }
     },
-    "node_modules/@babel/helper-compilation-targets/node_modules/semver": {
-      "version": "6.3.1",
-      "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.1.tgz",
-      "integrity": "sha512-BR7VvDCVHO+q2xBEWskxS6DJE1qRnb7DxzUrogb71CWoSficBxYsiAGd+Kl0mmq/MprG9yArRkyrQxTO6XjMzA==",
-      "dev": true,
-      "license": "ISC",
-      "bin": {
-        "semver": "bin/semver.js"
-      }
-    },
     "node_modules/@babel/helper-globals": {
       "version": "7.28.0",
       "resolved": "https://registry.npmjs.org/@babel/helper-globals/-/helper-globals-7.28.0.tgz",
@@ -555,31 +510,6 @@
         "node": ">=6.9.0"
       }
     },
-    "node_modules/@babel/traverse/node_modules/debug": {
-      "version": "4.4.3",
-      "resolved": "https://registry.npmjs.org/debug/-/debug-4.4.3.tgz",
-      "integrity": "sha512-RGwwWnwQvkVfavKVt22FGLw+xYSdzARwm0ru6DhTVA3umU5hZc28V3kO4stgYryrTlLpuvgI9GiijltAjNbcqA==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "ms": "^2.1.3"
-      },
-      "engines": {
-        "node": ">=6.0"
-      },
-      "peerDependenciesMeta": {
-        "supports-color": {
-          "optional": true
-        }
-      }
-    },
-    "node_modules/@babel/traverse/node_modules/ms": {
-      "version": "2.1.3",
-      "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.3.tgz",
-      "integrity": "sha512-6FlzubTLZG3J2a/NVCAleEhjzq5oxgHyaCU9yYXvcLsvoVaHJq/s5xXI6/XXP6tz7R9xAOtHnSO/tXtF3WRTlA==",
-      "dev": true,
-      "license": "MIT"
-    },
     "node_modules/@babel/types": {
       "version": "7.28.5",
       "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.28.5.tgz",
@@ -658,31 +588,6 @@
         "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
       }
     },
-    "node_modules/@eslint/config-array/node_modules/debug": {
-      "version": "4.4.3",
-      "resolved": "https://registry.npmjs.org/debug/-/debug-4.4.3.tgz",
-      "integrity": "sha512-RGwwWnwQvkVfavKVt22FGLw+xYSdzARwm0ru6DhTVA3umU5hZc28V3kO4stgYryrTlLpuvgI9GiijltAjNbcqA==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "ms": "^2.1.3"
-      },
-      "engines": {
-        "node": ">=6.0"
-      },
-      "peerDependenciesMeta": {
-        "supports-color": {
-          "optional": true
-        }
-      }
-    },
-    "node_modules/@eslint/config-array/node_modules/ms": {
-      "version": "2.1.3",
-      "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.3.tgz",
-      "integrity": "sha512-6FlzubTLZG3J2a/NVCAleEhjzq5oxgHyaCU9yYXvcLsvoVaHJq/s5xXI6/XXP6tz7R9xAOtHnSO/tXtF3WRTlA==",
-      "dev": true,
-      "license": "MIT"
-    },
     "node_modules/@eslint/config-helpers": {
       "version": "0.4.2",
       "resolved": "https://registry.npmjs.org/@eslint/config-helpers/-/config-helpers-0.4.2.tgz",
@@ -733,24 +638,6 @@
         "url": "https://opencollective.com/eslint"
       }
     },
-    "node_modules/@eslint/eslintrc/node_modules/debug": {
-      "version": "4.4.3",
-      "resolved": "https://registry.npmjs.org/debug/-/debug-4.4.3.tgz",
-      "integrity": "sha512-RGwwWnwQvkVfavKVt22FGLw+xYSdzARwm0ru6DhTVA3umU5hZc28V3kO4stgYryrTlLpuvgI9GiijltAjNbcqA==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "ms": "^2.1.3"
-      },
-      "engines": {
-        "node": ">=6.0"
-      },
-      "peerDependenciesMeta": {
-        "supports-color": {
-          "optional": true
-        }
-      }
-    },
     "node_modules/@eslint/eslintrc/node_modules/globals": {
       "version": "14.0.0",
       "resolved": "https://registry.npmjs.org/globals/-/globals-14.0.0.tgz",
@@ -764,13 +651,6 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
-    "node_modules/@eslint/eslintrc/node_modules/ms": {
-      "version": "2.1.3",
-      "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.3.tgz",
-      "integrity": "sha512-6FlzubTLZG3J2a/NVCAleEhjzq5oxgHyaCU9yYXvcLsvoVaHJq/s5xXI6/XXP6tz7R9xAOtHnSO/tXtF3WRTlA==",
-      "dev": true,
-      "license": "MIT"
-    },
     "node_modules/@eslint/js": {
       "version": "9.39.1",
       "resolved": "https://registry.npmjs.org/@eslint/js/-/js-9.39.1.tgz",
@@ -887,6 +767,20 @@
         "sprintf-js": "~1.0.2"
       }
     },
+    "node_modules/@istanbuljs/load-nyc-config/node_modules/find-up": {
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/find-up/-/find-up-4.1.0.tgz",
+      "integrity": "sha512-PpOwAdQ/YlXQ2vj8a3h8IipDuYRi3wceVQQGYWxNINccq40Anw7BlsEXCMbt1Zt+OLA6Fq9suIpIWD0OsnISlw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "locate-path": "^5.0.0",
+        "path-exists": "^4.0.0"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/@istanbuljs/load-nyc-config/node_modules/js-yaml": {
       "version": "3.14.2",
       "resolved": "https://registry.npmjs.org/js-yaml/-/js-yaml-3.14.2.tgz",
@@ -901,6 +795,58 @@
         "js-yaml": "bin/js-yaml.js"
       }
     },
+    "node_modules/@istanbuljs/load-nyc-config/node_modules/locate-path": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/locate-path/-/locate-path-5.0.0.tgz",
+      "integrity": "sha512-t7hw9pI+WvuwNJXwk5zVHpyhIqzg2qTlklJOf0mVxGSbe3Fp2VieZcduNYjaLDoy6p9uGpQEGWG87WpMKlNq8g==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "p-locate": "^4.1.0"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/@istanbuljs/load-nyc-config/node_modules/p-limit": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/p-limit/-/p-limit-2.3.0.tgz",
+      "integrity": "sha512-//88mFWSJx8lxCzwdAABTJL2MyWB12+eIY7MDL2SqLmAkeKU9qxRvWuSyTjm3FUmpBEMuFfckAIqEaVGUDxb6w==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "p-try": "^2.0.0"
+      },
+      "engines": {
+        "node": ">=6"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
+    "node_modules/@istanbuljs/load-nyc-config/node_modules/p-locate": {
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/p-locate/-/p-locate-4.1.0.tgz",
+      "integrity": "sha512-R79ZZ/0wAxKGu3oYMlz8jy/kbhsNrS7SKZ7PxEHBgJ5+F2mtFW2fK2cOtBh1cHYkQsbzFV7I+EoRKe6Yt0oK7A==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "p-limit": "^2.2.0"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/@istanbuljs/load-nyc-config/node_modules/resolve-from": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/resolve-from/-/resolve-from-5.0.0.tgz",
+      "integrity": "sha512-qYg9KP24dD5qka9J47d0aVky0N+b4fTU89LN9iDnjB5waksiC49rvMB0PrUJQGoTmH50XPiqOvAjDfaijGxYZw==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/@istanbuljs/schema": {
       "version": "0.1.3",
       "resolved": "https://registry.npmjs.org/@istanbuljs/schema/-/schema-0.1.3.tgz",
@@ -1690,16 +1636,6 @@
         "node": ">=8"
       }
     },
-    "node_modules/babel-plugin-istanbul/node_modules/semver": {
-      "version": "6.3.1",
-      "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.1.tgz",
-      "integrity": "sha512-BR7VvDCVHO+q2xBEWskxS6DJE1qRnb7DxzUrogb71CWoSficBxYsiAGd+Kl0mmq/MprG9yArRkyrQxTO6XjMzA==",
-      "dev": true,
-      "license": "ISC",
-      "bin": {
-        "semver": "bin/semver.js"
-      }
-    },
     "node_modules/babel-plugin-jest-hoist": {
       "version": "29.6.3",
       "resolved": "https://registry.npmjs.org/babel-plugin-jest-hoist/-/babel-plugin-jest-hoist-29.6.3.tgz",
@@ -1783,9 +1719,9 @@
       }
     },
     "node_modules/baseline-browser-mapping": {
-      "version": "2.8.32",
-      "resolved": "https://registry.npmjs.org/baseline-browser-mapping/-/baseline-browser-mapping-2.8.32.tgz",
-      "integrity": "sha512-OPz5aBThlyLFgxyhdwf/s2+8ab3OvT7AdTNvKHBwpXomIYeXqpUUuT8LrdtxZSsWJ4R4CU1un4XGh5Ez3nlTpw==",
+      "version": "2.9.5",
+      "resolved": "https://registry.npmjs.org/baseline-browser-mapping/-/baseline-browser-mapping-2.9.5.tgz",
+      "integrity": "sha512-D5vIoztZOq1XM54LUdttJVc96ggEsIfju2JBvht06pSzpckp3C7HReun67Bghzrtdsq9XdMGbSSB3v3GhMNmAA==",
       "dev": true,
       "license": "Apache-2.0",
       "bin": {
@@ -1812,29 +1748,44 @@
       }
     },
     "node_modules/body-parser": {
-      "version": "1.20.3",
-      "resolved": "https://registry.npmjs.org/body-parser/-/body-parser-1.20.3.tgz",
-      "integrity": "sha512-7rAxByjUMqQ3/bHJy7D6OGXvx/MMc4IqBn/X0fcM1QUcAItpZrBEYhWGem+tzXH90c+G01ypMcYJBO9Y30203g==",
+      "version": "1.20.4",
+      "resolved": "https://registry.npmjs.org/body-parser/-/body-parser-1.20.4.tgz",
+      "integrity": "sha512-ZTgYYLMOXY9qKU/57FAo8F+HA2dGX7bqGc71txDRC1rS4frdFI5R7NhluHxH6M0YItAP0sHB4uqAOcYKxO6uGA==",
       "license": "MIT",
       "dependencies": {
-        "bytes": "3.1.2",
+        "bytes": "~3.1.2",
         "content-type": "~1.0.5",
         "debug": "2.6.9",
         "depd": "2.0.0",
-        "destroy": "1.2.0",
-        "http-errors": "2.0.0",
-        "iconv-lite": "0.4.24",
-        "on-finished": "2.4.1",
-        "qs": "6.13.0",
-        "raw-body": "2.5.2",
+        "destroy": "~1.2.0",
+        "http-errors": "~2.0.1",
+        "iconv-lite": "~0.4.24",
+        "on-finished": "~2.4.1",
+        "qs": "~6.14.0",
+        "raw-body": "~2.5.3",
         "type-is": "~1.6.18",
-        "unpipe": "1.0.0"
+        "unpipe": "~1.0.0"
       },
       "engines": {
         "node": ">= 0.8",
         "npm": "1.2.8000 || >= 1.4.16"
       }
     },
+    "node_modules/body-parser/node_modules/debug": {
+      "version": "2.6.9",
+      "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
+      "integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
+      "license": "MIT",
+      "dependencies": {
+        "ms": "2.0.0"
+      }
+    },
+    "node_modules/body-parser/node_modules/ms": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
+      "integrity": "sha512-Tpp60P6IUJDTuOq/5Z8cdskzJujfwqfOTkrwIwj7IRISpnkJnT6SyJ4PCPnGMoFjC9ddhal5KVIYtAt97ix05A==",
+      "license": "MIT"
+    },
     "node_modules/brace-expansion": {
       "version": "1.1.12",
       "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.12.tgz",
@@ -1860,9 +1811,9 @@
       }
     },
     "node_modules/browserslist": {
-      "version": "4.28.0",
-      "resolved": "https://registry.npmjs.org/browserslist/-/browserslist-4.28.0.tgz",
-      "integrity": "sha512-tbydkR/CxfMwelN0vwdP/pLkDwyAASZ+VfWm4EOwlB6SWhx1sYnWLqo8N5j0rAzPfzfRaxt0mM/4wPU/Su84RQ==",
+      "version": "4.28.1",
+      "resolved": "https://registry.npmjs.org/browserslist/-/browserslist-4.28.1.tgz",
+      "integrity": "sha512-ZC5Bd0LgJXgwGqUknZY/vkUQ04r8NXnJZ3yYi4vDmSiZmC/pdSN0NbNRPxZpbtO4uAfDUAFffO8IZoM3Gj8IkA==",
       "dev": true,
       "funding": [
         {
@@ -1880,11 +1831,11 @@
       ],
       "license": "MIT",
       "dependencies": {
-        "baseline-browser-mapping": "^2.8.25",
-        "caniuse-lite": "^1.0.30001754",
-        "electron-to-chromium": "^1.5.249",
+        "baseline-browser-mapping": "^2.9.0",
+        "caniuse-lite": "^1.0.30001759",
+        "electron-to-chromium": "^1.5.263",
         "node-releases": "^2.0.27",
-        "update-browserslist-db": "^1.1.4"
+        "update-browserslist-db": "^1.2.0"
       },
       "bin": {
         "browserslist": "cli.js"
@@ -1994,9 +1945,9 @@
       }
     },
     "node_modules/caniuse-lite": {
-      "version": "1.0.30001757",
-      "resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30001757.tgz",
-      "integrity": "sha512-r0nnL/I28Zi/yjk1el6ilj27tKcdjLsNqAOZr0yVjWPrSQyHgKI2INaEWw21bAQSv2LXRt1XuCS/GomNpWOxsQ==",
+      "version": "1.0.30001759",
+      "resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30001759.tgz",
+      "integrity": "sha512-Pzfx9fOKoKvevQf8oCXoyNRQ5QyxJj+3O0Rqx2V5oxT61KGx8+n6hV/IUyJeifUci2clnmmKVpvtiqRzgiWjSw==",
       "dev": true,
       "funding": [
         {
@@ -2031,29 +1982,6 @@
         "url": "https://github.com/chalk/chalk?sponsor=1"
       }
     },
-    "node_modules/chalk/node_modules/has-flag": {
-      "version": "4.0.0",
-      "resolved": "https://registry.npmjs.org/has-flag/-/has-flag-4.0.0.tgz",
-      "integrity": "sha512-EykJT/Q1KjTWctppgIAgfSO0tKVuZUjhgMr17kqTumMl6Afv3EISleU7qZUzoXDFTAHTDC4NOoG/ZxU3EvlMPQ==",
-      "dev": true,
-      "license": "MIT",
-      "engines": {
-        "node": ">=8"
-      }
-    },
-    "node_modules/chalk/node_modules/supports-color": {
-      "version": "7.2.0",
-      "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-7.2.0.tgz",
-      "integrity": "sha512-qpCAvRl9stuOHveKsn7HncJRvv501qIacKzQlO/+Lwxc9+0q2wLyv4Dfvt80/DPn2pqOBsJdDiogXGR9+OvwRw==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "has-flag": "^4.0.0"
-      },
-      "engines": {
-        "node": ">=8"
-      }
-    },
     "node_modules/char-regex": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/char-regex/-/char-regex-1.0.2.tgz",
@@ -2089,6 +2017,19 @@
         "fsevents": "~2.3.2"
       }
     },
+    "node_modules/chokidar/node_modules/glob-parent": {
+      "version": "5.1.2",
+      "resolved": "https://registry.npmjs.org/glob-parent/-/glob-parent-5.1.2.tgz",
+      "integrity": "sha512-AOIgSQCepiJYwP3ARnGx+5VnTu2HBYdzbGP45eLw1vr3zB3vZLeyed1sC9hnbcOc9/SrMyM5RPQrkGz4aS9Zow==",
+      "dev": true,
+      "license": "ISC",
+      "dependencies": {
+        "is-glob": "^4.0.1"
+      },
+      "engines": {
+        "node": ">= 6"
+      }
+    },
     "node_modules/ci-info": {
       "version": "3.9.0",
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@@ -2231,18 +2172,18 @@
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+        "escape-html": "~1.0.3",
+        "etag": "~1.8.1",
+        "fresh": "0.5.2",
+        "http-errors": "2.0.0",
+        "mime": "1.6.0",
+        "ms": "2.1.3",
+        "on-finished": "2.4.1",
+        "range-parser": "~1.2.1",
+        "statuses": "2.0.1"
+      },
+      "engines": {
+        "node": ">= 0.8.0"
+      }
+    },
+    "node_modules/serve-static/node_modules/send/node_modules/encodeurl": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/encodeurl/-/encodeurl-1.0.2.tgz",
+      "integrity": "sha512-TPJXq8JqFaVYm2CWmPvnP2Iyo4ZSM7/QKcSmuMLDObfpH5fi7RUGmd/rTDf+rut/saiDiQEeVTNgAmJEdAOx0w==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
+    "node_modules/serve-static/node_modules/statuses": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/statuses/-/statuses-2.0.1.tgz",
+      "integrity": "sha512-RwNA9Z/7PrK06rYLIzFMlaF+l73iwpzsqRIFgbMLbTcLD6cOao82TaWefPXQvB2fOC4AjuYSEndS7N/mTCbkdQ==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
     "node_modules/setprototypeof": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/setprototypeof/-/setprototypeof-1.2.0.tgz",
@@ -5942,6 +5919,19 @@
         "node": ">=10"
       }
     },
+    "node_modules/simple-update-notifier/node_modules/semver": {
+      "version": "7.7.3",
+      "resolved": "https://registry.npmjs.org/semver/-/semver-7.7.3.tgz",
+      "integrity": "sha512-SdsKMrI9TdgjdweUSR9MweHA4EJ8YxHn8DFaDisvhVlUOe4BF1tLD7GAj0lIqWVl+dPb/rExr0Btby5loQm20Q==",
+      "dev": true,
+      "license": "ISC",
+      "bin": {
+        "semver": "bin/semver.js"
+      },
+      "engines": {
+        "node": ">=10"
+      }
+    },
     "node_modules/sisteransi": {
       "version": "1.0.5",
       "resolved": "https://registry.npmjs.org/sisteransi/-/sisteransi-1.0.5.tgz",
@@ -6009,10 +5999,20 @@
         "node": ">=10"
       }
     },
+    "node_modules/stack-utils/node_modules/escape-string-regexp": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/escape-string-regexp/-/escape-string-regexp-2.0.0.tgz",
+      "integrity": "sha512-UpzcLCXolUWcNu5HtVMHYdXJjArjsF9C0aNnquZYY4uW/Vu0miy5YoWvbV345HauVvcAUnpRuhMMcqTcGOY2+w==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/statuses": {
-      "version": "2.0.1",
-      "resolved": "https://registry.npmjs.org/statuses/-/statuses-2.0.1.tgz",
-      "integrity": "sha512-RwNA9Z/7PrK06rYLIzFMlaF+l73iwpzsqRIFgbMLbTcLD6cOao82TaWefPXQvB2fOC4AjuYSEndS7N/mTCbkdQ==",
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/statuses/-/statuses-2.0.2.tgz",
+      "integrity": "sha512-DvEy55V3DB7uknRo+4iOGT5fP1slR8wQohVdknigZPMpMstaKJQWhwiYBACJE3Ul2pTnATihhBYnRhZQHGBiRw==",
       "license": "MIT",
       "engines": {
         "node": ">= 0.8"
@@ -6106,44 +6106,24 @@
       }
     },
     "node_modules/superagent": {
-      "version": "8.1.2",
-      "resolved": "https://registry.npmjs.org/superagent/-/superagent-8.1.2.tgz",
-      "integrity": "sha512-6WTxW1EB6yCxV5VFOIPQruWGHqc3yI7hEmZK6h+pyk69Lk/Ut7rLUY6W/ONF2MjBuGjvmMiIpsrVJ2vjrHlslA==",
-      "deprecated": "Please upgrade to superagent v10.2.2+, see release notes at https://github.com/forwardemail/superagent/releases/tag/v10.2.2 - maintenance is supported by Forward Email @ https://forwardemail.net",
+      "version": "10.2.3",
+      "resolved": "https://registry.npmjs.org/superagent/-/superagent-10.2.3.tgz",
+      "integrity": "sha512-y/hkYGeXAj7wUMjxRbB21g/l6aAEituGXM9Rwl4o20+SX3e8YOSV6BxFXl+dL3Uk0mjSL3kCbNkwURm8/gEDig==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
-        "component-emitter": "^1.3.0",
+        "component-emitter": "^1.3.1",
         "cookiejar": "^2.1.4",
-        "debug": "^4.3.4",
+        "debug": "^4.3.7",
         "fast-safe-stringify": "^2.1.1",
-        "form-data": "^4.0.0",
-        "formidable": "^2.1.2",
+        "form-data": "^4.0.4",
+        "formidable": "^3.5.4",
         "methods": "^1.1.2",
         "mime": "2.6.0",
-        "qs": "^6.11.0",
-        "semver": "^7.3.8"
-      },
-      "engines": {
-        "node": ">=6.4.0 <13 || >=14"
-      }
-    },
-    "node_modules/superagent/node_modules/debug": {
-      "version": "4.4.3",
-      "resolved": "https://registry.npmjs.org/debug/-/debug-4.4.3.tgz",
-      "integrity": "sha512-RGwwWnwQvkVfavKVt22FGLw+xYSdzARwm0ru6DhTVA3umU5hZc28V3kO4stgYryrTlLpuvgI9GiijltAjNbcqA==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "ms": "^2.1.3"
+        "qs": "^6.11.2"
       },
       "engines": {
-        "node": ">=6.0"
-      },
-      "peerDependenciesMeta": {
-        "supports-color": {
-          "optional": true
-        }
+        "node": ">=14.18.0"
       }
     },
     "node_modules/superagent/node_modules/mime": {
@@ -6159,39 +6139,31 @@
         "node": ">=4.0.0"
       }
     },
-    "node_modules/superagent/node_modules/ms": {
-      "version": "2.1.3",
-      "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.3.tgz",
-      "integrity": "sha512-6FlzubTLZG3J2a/NVCAleEhjzq5oxgHyaCU9yYXvcLsvoVaHJq/s5xXI6/XXP6tz7R9xAOtHnSO/tXtF3WRTlA==",
-      "dev": true,
-      "license": "MIT"
-    },
     "node_modules/supertest": {
-      "version": "6.3.4",
-      "resolved": "https://registry.npmjs.org/supertest/-/supertest-6.3.4.tgz",
-      "integrity": "sha512-erY3HFDG0dPnhw4U+udPfrzXa4xhSG+n4rxfRuZWCUvjFWwKl+OxWf/7zk50s84/fAAs7vf5QAb9uRa0cCykxw==",
-      "deprecated": "Please upgrade to supertest v7.1.3+, see release notes at https://github.com/forwardemail/supertest/releases/tag/v7.1.3 - maintenance is supported by Forward Email @ https://forwardemail.net",
+      "version": "7.1.4",
+      "resolved": "https://registry.npmjs.org/supertest/-/supertest-7.1.4.tgz",
+      "integrity": "sha512-tjLPs7dVyqgItVFirHYqe2T+MfWc2VOBQ8QFKKbWTA3PU7liZR8zoSpAi/C1k1ilm9RsXIKYf197oap9wXGVYg==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
         "methods": "^1.1.2",
-        "superagent": "^8.1.2"
+        "superagent": "^10.2.3"
       },
       "engines": {
-        "node": ">=6.4.0"
+        "node": ">=14.18.0"
       }
     },
     "node_modules/supports-color": {
-      "version": "5.5.0",
-      "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-5.5.0.tgz",
-      "integrity": "sha512-QjVjwdXIt408MIiAqCX4oUKsgU2EqAGzs2Ppkm4aQYbjm+ZEWEcW4SfFNTr4uMNZma0ey4f5lgLrkB0aX0QMow==",
+      "version": "7.2.0",
+      "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-7.2.0.tgz",
+      "integrity": "sha512-qpCAvRl9stuOHveKsn7HncJRvv501qIacKzQlO/+Lwxc9+0q2wLyv4Dfvt80/DPn2pqOBsJdDiogXGR9+OvwRw==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
-        "has-flag": "^3.0.0"
+        "has-flag": "^4.0.0"
       },
       "engines": {
-        "node": ">=4"
+        "node": ">=8"
       }
     },
     "node_modules/supports-preserve-symlinks-flag": {
@@ -6399,9 +6371,9 @@
       }
     },
     "node_modules/update-browserslist-db": {
-      "version": "1.1.4",
-      "resolved": "https://registry.npmjs.org/update-browserslist-db/-/update-browserslist-db-1.1.4.tgz",
-      "integrity": "sha512-q0SPT4xyU84saUX+tomz1WLkxUbuaJnR1xWt17M7fJtEJigJeWUNGUqrauFXsHnqev9y9JTRGwk13tFBuKby4A==",
+      "version": "1.2.2",
+      "resolved": "https://registry.npmjs.org/update-browserslist-db/-/update-browserslist-db-1.2.2.tgz",
+      "integrity": "sha512-E85pfNzMQ9jpKkA7+TJAi4TJN+tBCuWh5rUcS/sv6cFi+1q9LYDwDI5dpUL0u/73EElyQ8d3TEaeW4sPedBqYA==",
       "dev": true,
       "funding": [
         {
diff --git a/package.json b/package.json
index a77c168..846e6b5 100644
--- a/package.json
+++ b/package.json
@@ -7,7 +7,7 @@
   "scripts": {
     "start": "node server.js",
     "dev": "nodemon server.js",
-    "lint": "eslint .",
+    "lint": "eslint . --max-warnings 0",
     "test": "cross-env NODE_ENV=test node --experimental-vm-modules node_modules/jest/bin/jest.js --runInBand",
     "test:watch": "cross-env NODE_ENV=test node --experimental-vm-modules node_modules/jest/bin/jest.js --watch",
     "test:coverage": "cross-env NODE_ENV=test node --experimental-vm-modules node_modules/jest/bin/jest.js --runInBand --coverage"
@@ -52,6 +52,6 @@
     "jest": "^29.7.0",
     "mongodb-memory-server": "^10.3.0",
     "nodemon": "^3.0.1",
-    "supertest": "^6.3.3"
+    "supertest": "^7.1.0"
   }
 }
\ No newline at end of file
diff --git a/tests/integration/admin.test.js b/tests/integration/admin.test.js
index 7db8bf3..433aeeb 100644
--- a/tests/integration/admin.test.js
+++ b/tests/integration/admin.test.js
@@ -15,9 +15,9 @@ describe('Admin Controller - Integration Tests', () => {
 
   beforeEach(async () => {
     // Create Admin User with role: 'admin'
-    const adminAuth = await createAuthenticatedUser({ 
-      userId: 9001, 
-      username: 'admin', 
+    const adminAuth = await createAuthenticatedUser({
+      userId: 9001,
+      username: 'admin',
       email: 'admin@test.com',
       role: 'admin'
     });
@@ -25,9 +25,9 @@ describe('Admin Controller - Integration Tests', () => {
     adminToken = adminAuth.token;
 
     // Create Regular User with role: 'user'
-    const regularAuth = await createAuthenticatedUser({ 
-      userId: 9002, 
-      username: 'regular', 
+    const regularAuth = await createAuthenticatedUser({
+      userId: 9002,
+      username: 'regular',
       email: 'regular@test.com',
       role: 'user'
     });
@@ -46,14 +46,14 @@ describe('Admin Controller - Integration Tests', () => {
           rating: 4.5
         });
 
-        const report1 = await db.addReport({
+        await db.addReport({
           placeId: place.placeId,
           userId: regularUser.userId,
           reason: 'INAPPROPRIATE_CONTENT',
           description: 'This place has inappropriate content'
         });
 
-        const report2 = await db.addReport({
+        await db.addReport({
           placeId: place.placeId,
           userId: regularUser.userId,
           reason: 'INCORRECT_INFORMATION',
@@ -702,7 +702,7 @@ describe('Admin Controller - Integration Tests', () => {
         const originalEnv = process.env.NODE_ENV;
         const originalUser = process.env.ADMIN_DEV_USER;
         const originalPass = process.env.ADMIN_DEV_PASS;
-        
+
         process.env.NODE_ENV = 'development';
         delete process.env.ADMIN_DEV_USER;
         delete process.env.ADMIN_DEV_PASS;
diff --git a/tests/integration/database.mongo.test.js b/tests/integration/database.mongo.test.js
index 1c23dcf..ad11ce4 100644
--- a/tests/integration/database.mongo.test.js
+++ b/tests/integration/database.mongo.test.js
@@ -30,7 +30,7 @@ describe('Database Integration Tests', () => {
     // Ensure clean state before each test
     try {
       await db.clearAllData();
-    } catch (error) {
+    } catch {
       // DB might not be connected yet, ignore
     }
   });
@@ -52,7 +52,7 @@ describe('Database Integration Tests', () => {
       const counterName = 'testCounter';
       const first = await db.getNextId(counterName);
       const second = await db.getNextId(counterName);
-      
+
       expect(second).toBe(first + 1);
       expect(typeof first).toBe('number');
       expect(typeof second).toBe('number');
@@ -83,19 +83,19 @@ describe('Database Integration Tests', () => {
 
     test('should clear all data from database', async () => {
       // Create test data
-      await models.User.create({ 
-        userId: 9999, 
-        name: 'Tester', 
-        email: 'tester@example.com', 
-        password: 'pass' 
+      await models.User.create({
+        userId: 9999,
+        name: 'Tester',
+        email: 'tester@example.com',
+        password: 'pass'
       });
-      
+
       let count = await models.User.countDocuments();
       expect(count).toBeGreaterThan(0);
 
       // Clear all data
       await db.clearAllData();
-      
+
       count = await models.User.countDocuments();
       expect(count).toBe(0);
     });
@@ -107,12 +107,12 @@ describe('Database Integration Tests', () => {
       await db.disconnectDB();
       await db.clearAllData();
       process.env.DISABLE_SEEDING = 'false';
-      
+
       await db.connectDB();
 
       const userCount = await models.User.countDocuments();
       expect(userCount).toBe(seedData.users.length);
-      
+
       // Verify data integrity
       const users = await models.User.find({});
       expect(users).toHaveLength(seedData.users.length);
@@ -123,7 +123,7 @@ describe('Database Integration Tests', () => {
       await db.disconnectDB();
       await db.clearAllData();
       process.env.DISABLE_SEEDING = 'true';
-      
+
       await db.connectDB();
 
       const userCount = await models.User.countDocuments();
diff --git a/tests/integration/favourite.test.js b/tests/integration/favourite.test.js
index 89643fe..894de03 100644
--- a/tests/integration/favourite.test.js
+++ b/tests/integration/favourite.test.js
@@ -25,7 +25,7 @@ import { api, createAuthenticatedUser, generateTestJWT, authRequest } from '../h
 import db from '../../config/db.js';
 
 describe('Favourite Controller - Integration Tests', () => {
-  
+
   describe('GET /users/:userId/favourite-places', () => {
     describe('Happy Path - Successful Retrieval of Favourites', () => {
       it('should return 200 and empty array when there are no favourites', async () => {
@@ -75,7 +75,7 @@ describe('Favourite Controller - Integration Tests', () => {
       it('should return multiple favourite places', async () => {
         // Arrange
         const { user, token } = await createAuthenticatedUser();
-        
+
         const place1 = await db.createPlace({
           name: 'Museum 1',
           category: 'museum',
@@ -128,7 +128,7 @@ describe('Favourite Controller - Integration Tests', () => {
 
       it('should return 403 when user tries to view another user\'s favourites', async () => {
         // Arrange - Two users
-        const { user: user1, token: token1 } = await createAuthenticatedUser({ email: 'user1@example.com' });
+        const { token: token1 } = await createAuthenticatedUser({ email: 'user1@example.com' });
         const { user: user2 } = await createAuthenticatedUser({ email: 'user2@example.com' });
 
         // Act - User1 tries to view User2's favourites
@@ -317,7 +317,7 @@ describe('Favourite Controller - Integration Tests', () => {
 
       it('should return 403 when user tries to add to another user\'s favourites', async () => {
         // Arrange
-        const { user: user1, token: token1 } = await createAuthenticatedUser({ email: 'user1@example.com' });
+        const { token: token1 } = await createAuthenticatedUser({ email: 'user1@example.com' });
         const { user: user2 } = await createAuthenticatedUser({ email: 'user2@example.com' });
         const testPlace = await db.createPlace({
           name: 'Test Place',
@@ -404,7 +404,7 @@ describe('Favourite Controller - Integration Tests', () => {
         // Arrange - Two users
         const { user: user1, token: token1 } = await createAuthenticatedUser({ email: 'user1@example.com' });
         const { user: user2 } = await createAuthenticatedUser({ email: 'user2@example.com' });
-        
+
         const testPlace = await db.createPlace({
           name: 'Test Place',
           category: 'restaurant',
@@ -439,9 +439,9 @@ describe('Favourite Controller - Integration Tests', () => {
 
       it('should return 403 when user tries to remove from another user\'s favourites', async () => {
         // Arrange
-        const { user: user1, token: token1 } = await createAuthenticatedUser({ email: 'user1@example.com' });
+        const { token: token1 } = await createAuthenticatedUser({ email: 'user1@example.com' });
         const { user: user2 } = await createAuthenticatedUser({ email: 'user2@example.com' });
-        
+
         const testPlace = await db.createPlace({
           name: 'Test Place',
           category: 'cafe',
diff --git a/tests/integration/navigation.test.js b/tests/integration/navigation.test.js
index ee0fa55..d609c0d 100644
--- a/tests/integration/navigation.test.js
+++ b/tests/integration/navigation.test.js
@@ -8,13 +8,11 @@ import { api, createAuthenticatedUser } from '../helpers/testUtils.js';
 
 describe('Navigation Controller - Integration Tests', () => {
   describe('GET /navigation', () => {
-    let user;
     let token;
 
     beforeEach(async () => {
       // Create authenticated user for each test
       const auth = await createAuthenticatedUser();
-      user = auth.user;
       token = auth.token;
     });
 
diff --git a/tests/integration/place.test.js b/tests/integration/place.test.js
index bd50a21..3fe42d9 100644
--- a/tests/integration/place.test.js
+++ b/tests/integration/place.test.js
@@ -15,11 +15,11 @@
  * - GET /places/search - Search places with keywords
  */
 
-import { api, createAuthenticatedUser, createTestUser, generateTestJWT, authRequest } from '../helpers/testUtils.js';
+import { api, createAuthenticatedUser, createTestUser, authRequest } from '../helpers/testUtils.js';
 import db from '../../config/db.js';
 
 describe('Place Controller - Integration Tests', () => {
-  
+
   describe('GET /places/:placeId', () => {
     describe('Happy Path - Successful Retrieval Place', () => {
       it('should return 200 and the data of the place', async () => {
@@ -243,7 +243,7 @@ describe('Place Controller - Integration Tests', () => {
           city: 'Athens'
         });
 
-        const { user, token } = await createAuthenticatedUser();
+        const { token } = await createAuthenticatedUser();
 
         // Act - Only rating, without comment
         const response = await authRequest(token)
@@ -648,7 +648,7 @@ describe('Place Controller - Integration Tests', () => {
     describe('Happy Path - Successής Searchήτηση', () => {
       it('should return places that match with the keyword', async () => {
         // Arrange - Create test places
-        const place1 = await db.createPlace({
+        await db.createPlace({
           name: 'Acropolis Museum',
           category: 'museum',
           description: 'Ancient Greek artifacts',
@@ -656,7 +656,7 @@ describe('Place Controller - Integration Tests', () => {
           country: 'Greece'
         });
 
-        const place2 = await db.createPlace({
+        await db.createPlace({
           name: 'National Archaeological Museum',
           category: 'museum',
           description: 'Archaeological treasures',
@@ -664,7 +664,7 @@ describe('Place Controller - Integration Tests', () => {
           country: 'Greece'
         });
 
-        const place3 = await db.createPlace({
+        await db.createPlace({
           name: 'Taverna Plaka',
           category: 'restaurant',
           description: 'Traditional Greek food',
diff --git a/tests/integration/preference.test.js b/tests/integration/preference.test.js
index 51a2576..60f5631 100644
--- a/tests/integration/preference.test.js
+++ b/tests/integration/preference.test.js
@@ -19,7 +19,7 @@ import { api, createAuthenticatedUser, generateTestJWT, authRequest } from '../h
 import db from '../../config/db.js';
 
 describe('Preference Controller - Integration Tests', () => {
-  
+
   describe('GET /users/:userId/preference-profiles', () => {
     describe('Happy Path - Successful Retrieval Profiles', () => {
       it('should return 200 and empty array when do not exist profiles', async () => {
@@ -39,7 +39,7 @@ describe('Preference Controller - Integration Tests', () => {
       it('should return the preference profiles of the user', async () => {
         // Arrange
         const { user, token } = await createAuthenticatedUser();
-        
+
         // Create profile
         await db.addPreferenceProfile({
           userId: user.userId,
@@ -63,7 +63,7 @@ describe('Preference Controller - Integration Tests', () => {
       it('should return πολλαπλά profiles', async () => {
         // Arrange
         const { user, token } = await createAuthenticatedUser();
-        
+
         await db.addPreferenceProfile({
           userId: user.userId,
           name: 'Profile 1',
@@ -111,7 +111,7 @@ describe('Preference Controller - Integration Tests', () => {
 
       it('should return 403 when userς προσπαθεί να δει profiles another', async () => {
         // Arrange - Two χρήστες
-        const { user: user1, token: token1 } = await createAuthenticatedUser({ email: 'user1@example.com' });
+        const { token: token1 } = await createAuthenticatedUser({ email: 'user1@example.com' });
         const { user: user2 } = await createAuthenticatedUser({ email: 'user2@example.com' });
 
         // Act - User1 προσπαθεί να δει profiles of the User2
@@ -352,7 +352,7 @@ describe('Preference Controller - Integration Tests', () => {
 
       it('should return 403 when userς προσπαθεί να δημιουργήσει to another user', async () => {
         // Arrange
-        const { user: user1, token: token1 } = await createAuthenticatedUser({ email: 'user1@example.com' });
+        const { token: token1 } = await createAuthenticatedUser({ email: 'user1@example.com' });
         const { user: user2 } = await createAuthenticatedUser({ email: 'user2@example.com' });
 
         // Act - User1 προσπαθεί να δημιουργήσει profile for User2
@@ -373,7 +373,7 @@ describe('Preference Controller - Integration Tests', () => {
       it('should update the preference profile', async () => {
         // Arrange
         const { user, token } = await createAuthenticatedUser();
-        
+
         // Create profile
         const profile = await db.addPreferenceProfile({
           userId: user.userId,
@@ -402,7 +402,7 @@ describe('Preference Controller - Integration Tests', () => {
       it('should allow partial update (only name)', async () => {
         // Arrange
         const { user, token } = await createAuthenticatedUser();
-        
+
         const profile = await db.addPreferenceProfile({
           userId: user.userId,
           name: 'Original',
@@ -427,7 +427,7 @@ describe('Preference Controller - Integration Tests', () => {
       it('should allow partial update (only categories)', async () => {
         // Arrange
         const { user, token } = await createAuthenticatedUser();
-        
+
         const profile = await db.addPreferenceProfile({
           userId: user.userId,
           name: 'My Profile',
@@ -452,7 +452,7 @@ describe('Preference Controller - Integration Tests', () => {
       it('should support legacy selectedPreferences field', async () => {
         // Arrange
         const { user, token } = await createAuthenticatedUser();
-        
+
         const profile = await db.addPreferenceProfile({
           userId: user.userId,
           name: 'Profile',
@@ -474,7 +474,7 @@ describe('Preference Controller - Integration Tests', () => {
       it('should contain HATEOAS links', async () => {
         // Arrange
         const { user, token } = await createAuthenticatedUser();
-        
+
         const profile = await db.addPreferenceProfile({
           userId: user.userId,
           name: 'Profile',
@@ -498,7 +498,7 @@ describe('Preference Controller - Integration Tests', () => {
       it('should return 400 when οι categories είναι empty array', async () => {
         // Arrange
         const { user, token } = await createAuthenticatedUser();
-        
+
         const profile = await db.addPreferenceProfile({
           userId: user.userId,
           name: 'Profile',
@@ -520,7 +520,7 @@ describe('Preference Controller - Integration Tests', () => {
       it('should return 400 when οι categories είναι invalid', async () => {
         // Arrange
         const { user, token } = await createAuthenticatedUser();
-        
+
         const profile = await db.addPreferenceProfile({
           userId: user.userId,
           name: 'Profile',
@@ -564,7 +564,7 @@ describe('Preference Controller - Integration Tests', () => {
         // Arrange - Two χρήστες
         const { user: user1, token: token1 } = await createAuthenticatedUser({ email: 'user1@example.com' });
         const { user: user2 } = await createAuthenticatedUser({ email: 'user2@example.com' });
-        
+
         // User2 δημιουργεί profile
         const user2Profile = await db.addPreferenceProfile({
           userId: user2.userId,
@@ -603,9 +603,9 @@ describe('Preference Controller - Integration Tests', () => {
 
       it('should return 403 when userς προσπαθεί να ενημερώσει profile another', async () => {
         // Arrange
-        const { user: user1, token: token1 } = await createAuthenticatedUser({ email: 'user1@example.com' });
+        const { token: token1 } = await createAuthenticatedUser({ email: 'user1@example.com' });
         const { user: user2 } = await createAuthenticatedUser({ email: 'user2@example.com' });
-        
+
         const user2Profile = await db.addPreferenceProfile({
           userId: user2.userId,
           name: 'User2 Profile',
@@ -630,7 +630,7 @@ describe('Preference Controller - Integration Tests', () => {
       it('should delete the preference profile', async () => {
         // Arrange
         const { user, token } = await createAuthenticatedUser();
-        
+
         const profile = await db.addPreferenceProfile({
           userId: user.userId,
           name: 'To Delete',
@@ -648,7 +648,7 @@ describe('Preference Controller - Integration Tests', () => {
       it('should not exist the profile μετά the διαγραφή', async () => {
         // Arrange
         const { user, token } = await createAuthenticatedUser();
-        
+
         const profile = await db.addPreferenceProfile({
           userId: user.userId,
           name: 'To Delete',
@@ -688,7 +688,7 @@ describe('Preference Controller - Integration Tests', () => {
         // Arrange
         const { user: user1, token: token1 } = await createAuthenticatedUser({ email: 'user1@example.com' });
         const { user: user2 } = await createAuthenticatedUser({ email: 'user2@example.com' });
-        
+
         const user2Profile = await db.addPreferenceProfile({
           userId: user2.userId,
           name: 'User2 Profile',
@@ -719,9 +719,9 @@ describe('Preference Controller - Integration Tests', () => {
 
       it('should return 403 when userς προσπαθεί να διαγράψει profile another', async () => {
         // Arrange
-        const { user: user1, token: token1 } = await createAuthenticatedUser({ email: 'user1@example.com' });
+        const { token: token1 } = await createAuthenticatedUser({ email: 'user1@example.com' });
         const { user: user2 } = await createAuthenticatedUser({ email: 'user2@example.com' });
-        
+
         const user2Profile = await db.addPreferenceProfile({
           userId: user2.userId,
           name: 'User2 Profile',
@@ -743,7 +743,7 @@ describe('Preference Controller - Integration Tests', () => {
       it('must  ενεργοποιεί the preference profile', async () => {
         // Arrange
         const { user, token } = await createAuthenticatedUser();
-        
+
         const profile = await db.addPreferenceProfile({
           userId: user.userId,
           name: 'Active Profile',
@@ -764,7 +764,7 @@ describe('Preference Controller - Integration Tests', () => {
       it('should update the activeProfile of the user', async () => {
         // Arrange
         const { user, token } = await createAuthenticatedUser();
-        
+
         const profile = await db.addPreferenceProfile({
           userId: user.userId,
           name: 'Profile',
@@ -785,7 +785,7 @@ describe('Preference Controller - Integration Tests', () => {
       it('should contain HATEOAS links', async () => {
         // Arrange
         const { user, token } = await createAuthenticatedUser();
-        
+
         const profile = await db.addPreferenceProfile({
           userId: user.userId,
           name: 'Profile',
@@ -852,9 +852,9 @@ describe('Preference Controller - Integration Tests', () => {
 
       it('should return 403 when userς προσπαθεί να ενεργοποιήσει profile another', async () => {
         // Arrange
-        const { user: user1, token: token1 } = await createAuthenticatedUser({ email: 'user1@example.com' });
+        const { token: token1 } = await createAuthenticatedUser({ email: 'user1@example.com' });
         const { user: user2 } = await createAuthenticatedUser({ email: 'user2@example.com' });
-        
+
         const user2Profile = await db.addPreferenceProfile({
           userId: user2.userId,
           name: 'User2 Profile',
diff --git a/tests/integration/recommendation.test.js b/tests/integration/recommendation.test.js
index f8ad89c..48987f9 100644
--- a/tests/integration/recommendation.test.js
+++ b/tests/integration/recommendation.test.js
@@ -21,7 +21,7 @@ import { api, createAuthenticatedUser, generateTestJWT, authRequest } from '../h
 import db from '../../config/db.js';
 
 describe('Recommendation Controller - Integration Tests', () => {
-  
+
   describe('GET /users/:userId/recommendations', () => {
     describe('Happy Path - Successful Retrieval Recommendations', () => {
       it('should return 200 and empty array when does not exist preference profile', async () => {
@@ -42,7 +42,7 @@ describe('Recommendation Controller - Integration Tests', () => {
       it('should return places that match with τις preferences of the user', async () => {
         // Arrange
         const { user, token } = await createAuthenticatedUser();
-        
+
         // Create preference profile with MUSEUM
         await db.addPreferenceProfile({
           userId: user.userId,
@@ -74,26 +74,26 @@ describe('Recommendation Controller - Integration Tests', () => {
         // Assert
         expect(response.status).toBe(200);
         expect(response.body.success).toBe(true);
-        
+
         // Verify only MUSEUM places επιστρέφονται (μπορεί να exist and from seed data)
         expect(response.body.data.recommendations.length).toBeGreaterThanOrEqual(1);
         const allMuseums = response.body.data.recommendations.every(r => r.category === 'MUSEUM');
         expect(allMuseums).toBe(true);
-        
+
         // Verify the δικό μας museum exists to results
         const placeIds = response.body.data.recommendations.map(r => r.placeId);
         expect(placeIds).toContain(museumPlace.placeId);
-        
+
         // Verify the beach ΔΕΝ exists
         expect(placeIds).not.toContain(beachPlace.placeId);
-        
+
         expect(response.body.message).toMatch(/generated successfully/i);
       });
 
       it('should filter correctly multiple categories', async () => {
         // Arrange
         const { user, token } = await createAuthenticatedUser();
-        
+
         // Preference profile with NIGHTLIFE and SHOPPING (πιθανόν do not exist to seed data)
         await db.addPreferenceProfile({
           userId: user.userId,
@@ -133,14 +133,14 @@ describe('Recommendation Controller - Integration Tests', () => {
         // Assert
         expect(response.status).toBe(200);
         expect(response.body.data.recommendations.length).toBeGreaterThanOrEqual(2);
-        
+
         const placeIds = response.body.data.recommendations.map(r => r.placeId);
         expect(placeIds).toContain(nightclub.placeId);
         expect(placeIds).toContain(mall.placeId);
-        
+
         // Verify SPORTS place is NOT included
         expect(placeIds).not.toContain(stadium.placeId);
-        
+
         // Verify only NIGHTLIFE and SHOPPING categories
         const categories = response.body.data.recommendations.map(r => r.category);
         categories.forEach(cat => {
@@ -151,7 +151,7 @@ describe('Recommendation Controller - Integration Tests', () => {
       it('should exclude disliked places from the recommendations', async () => {
         // Arrange
         const { user, token } = await createAuthenticatedUser();
-        
+
         // Preference profile with PARK (does not exist to seed data)
         await db.addPreferenceProfile({
           userId: user.userId,
@@ -185,11 +185,11 @@ describe('Recommendation Controller - Integration Tests', () => {
         // Assert
         expect(response.status).toBe(200);
         expect(response.body.data.recommendations.length).toBeGreaterThanOrEqual(1);
-        
+
         // Verify park2 is in recommendations
         const placeIds = response.body.data.recommendations.map(r => r.placeId);
         expect(placeIds).toContain(park2.placeId);
-        
+
         // Verify disliked place (park1) is NOT in recommendations
         expect(placeIds).not.toContain(park1.placeId);
       });
@@ -197,7 +197,7 @@ describe('Recommendation Controller - Integration Tests', () => {
       it('should sort places by rating (without location)', async () => {
         // Arrange
         const { user, token } = await createAuthenticatedUser();
-        
+
         await db.addPreferenceProfile({
           userId: user.userId,
           name: 'Beach Lover',
@@ -235,7 +235,7 @@ describe('Recommendation Controller - Integration Tests', () => {
         // Assert
         expect(response.status).toBe(200);
         expect(response.body.data.recommendations.length).toBeGreaterThanOrEqual(3);
-        
+
         // Verify sorting by rating (highest first) - ελέγχουwith the 3 πρώτα
         const ratings = response.body.data.recommendations.map(r => r.rating);
         expect(ratings[0]).toBeGreaterThanOrEqual(ratings[1]);
@@ -245,7 +245,7 @@ describe('Recommendation Controller - Integration Tests', () => {
       it('should return μέχρι 10 recommendations', async () => {
         // Arrange
         const { user, token } = await createAuthenticatedUser();
-        
+
         await db.addPreferenceProfile({
           userId: user.userId,
           name: 'Park Lover',
@@ -274,7 +274,7 @@ describe('Recommendation Controller - Integration Tests', () => {
       it('should contain reviews for each place', async () => {
         // Arrange
         const { user, token } = await createAuthenticatedUser();
-        
+
         await db.addPreferenceProfile({
           userId: user.userId,
           name: 'Culture Profile',
@@ -303,16 +303,16 @@ describe('Recommendation Controller - Integration Tests', () => {
         // Assert
         expect(response.status).toBe(200);
         expect(response.body.data.recommendations.length).toBeGreaterThanOrEqual(1);
-        
+
         // Find the place with our review
         const placeWithReview = response.body.data.recommendations.find(p => p.placeId === place.placeId);
         expect(placeWithReview).toBeDefined();
         expect(placeWithReview.reviews).toHaveLength(1);
         expect(placeWithReview.reviews[0].comment).toBe('Great place!');
-    });      it('should contain HATEOAS links', async () => {
+      }); it('should contain HATEOAS links', async () => {
         // Arrange
         const { user, token } = await createAuthenticatedUser();
-        
+
         await db.addPreferenceProfile({
           userId: user.userId,
           name: 'Test Profile',
@@ -339,7 +339,7 @@ describe('Recommendation Controller - Integration Tests', () => {
       it('should return the activeProfile name', async () => {
         // Arrange
         const { user, token } = await createAuthenticatedUser();
-        
+
         await db.addPreferenceProfile({
           userId: user.userId,
           name: 'My Active Profile',
@@ -365,7 +365,7 @@ describe('Recommendation Controller - Integration Tests', () => {
       it('should use the more πρόσφαthe profile if does not exist active', async () => {
         // Arrange
         const { user, token } = await createAuthenticatedUser();
-        
+
         // Create δύο profiles
         await db.addPreferenceProfile({
           userId: user.userId,
@@ -402,7 +402,7 @@ describe('Recommendation Controller - Integration Tests', () => {
       it('should sort places by distance when location is provided', async () => {
         // Arrange
         const { user, token } = await createAuthenticatedUser();
-        
+
         await db.addPreferenceProfile({
           userId: user.userId,
           name: 'Restaurant Profile',
@@ -437,11 +437,11 @@ describe('Recommendation Controller - Integration Tests', () => {
         // Assert
         expect(response.status).toBe(200);
         expect(response.body.data.recommendations.length).toBeGreaterThanOrEqual(2);
-        
+
         // Find indices of test places
         const nearIndex = response.body.data.recommendations.findIndex(p => p.name === 'Near Restaurant');
         const farIndex = response.body.data.recommendations.findIndex(p => p.name === 'Far Restaurant');
-        
+
         // Verify the κοντινό εστιατόριο είναι πρώthe (παρά the χαμηλότερο rating)
         expect(nearIndex).toBeGreaterThanOrEqual(0);
         expect(farIndex).toBeGreaterThanOrEqual(0);
@@ -452,7 +452,7 @@ describe('Recommendation Controller - Integration Tests', () => {
       it('should filter places βάσει maxDistance', async () => {
         // Arrange
         const { user, token } = await createAuthenticatedUser();
-        
+
         await db.addPreferenceProfile({
           userId: user.userId,
           name: 'Cafe Profile',
@@ -486,11 +486,11 @@ describe('Recommendation Controller - Integration Tests', () => {
         // Assert
         expect(response.status).toBe(200);
         expect(response.body.data.recommendations.length).toBeGreaterThanOrEqual(1);
-        
+
         // Verify nearby cafe is included
         const names = response.body.data.recommendations.map(p => p.name);
         expect(names).toContain('Nearby Cafe');
-        
+
         // Verify all places are within maxDistance
         response.body.data.recommendations.forEach(place => {
           if (place.distance !== undefined) {
@@ -502,7 +502,7 @@ describe('Recommendation Controller - Integration Tests', () => {
       it('should place locations without coordinates at the end', async () => {
         // Arrange
         const { user, token } = await createAuthenticatedUser();
-        
+
         await db.addPreferenceProfile({
           userId: user.userId,
           name: 'Shopping Profile',
@@ -535,11 +535,11 @@ describe('Recommendation Controller - Integration Tests', () => {
         // Assert
         expect(response.status).toBe(200);
         expect(response.body.data.recommendations.length).toBeGreaterThanOrEqual(2);
-        
+
         // Find indices
         const withLocationIndex = response.body.data.recommendations.findIndex(p => p.name === 'Mall with Location');
         const withoutLocationIndex = response.body.data.recommendations.findIndex(p => p.name === 'Mall without Location');
-        
+
         // Place with location έρχεται πρώthe from the place without location
         expect(withLocationIndex).toBeGreaterThanOrEqual(0);
         expect(withoutLocationIndex).toBeGreaterThanOrEqual(0);
@@ -578,7 +578,7 @@ describe('Recommendation Controller - Integration Tests', () => {
 
       it('should return 403 when userς προσπαθεί να δει recommendations another', async () => {
         // Arrange - Two χρήστες
-        const { user: user1, token: token1 } = await createAuthenticatedUser({ email: 'user1@example.com' });
+        const { token: token1 } = await createAuthenticatedUser({ email: 'user1@example.com' });
         const { user: user2 } = await createAuthenticatedUser({ email: 'user2@example.com' });
 
         // Act - User1 προσπαθεί να δει recommendations of the User2
@@ -593,7 +593,7 @@ describe('Recommendation Controller - Integration Tests', () => {
       it('should handle user with preferences αλλά without matching places', async () => {
         // Arrange
         const { user, token } = await createAuthenticatedUser();
-        
+
         await db.addPreferenceProfile({
           userId: user.userId,
           name: 'Rare Preferences',
@@ -611,7 +611,7 @@ describe('Recommendation Controller - Integration Tests', () => {
       it('should handle user που έχει disliked all the matching places', async () => {
         // Arrange
         const { user, token } = await createAuthenticatedUser();
-        
+
         await db.addPreferenceProfile({
           userId: user.userId,
           name: 'Museum Profile',
@@ -620,7 +620,7 @@ describe('Recommendation Controller - Integration Tests', () => {
 
         // Get all MUSEUM places
         const allMuseums = await db.getPlacesByCategories(['MUSEUM']);
-        
+
         // Dislike ALL museums
         for (const museum of allMuseums) {
           await db.addDislikedPlace(user.userId, museum.placeId);
@@ -637,7 +637,7 @@ describe('Recommendation Controller - Integration Tests', () => {
       it('should handle invalid location parameters', async () => {
         // Arrange
         const { user, token } = await createAuthenticatedUser();
-        
+
         await db.addPreferenceProfile({
           userId: user.userId,
           name: 'Test Profile',
diff --git a/tests/integration/security.test.js b/tests/integration/security.test.js
index 0e46225..4bf1444 100644
--- a/tests/integration/security.test.js
+++ b/tests/integration/security.test.js
@@ -90,7 +90,7 @@ describe('Security Tests', () => {
         describe('User Resource Access', () => {
             it('should prevent user from accessing another user profile', async () => {
                 // Arrange - Create two users
-                const { user: user1, token: token1 } = await createAuthenticatedUser({
+                const { token: token1 } = await createAuthenticatedUser({
                     email: 'user1profile@test.com'
                 });
                 const { user: user2 } = await createAuthenticatedUser({
@@ -108,7 +108,7 @@ describe('Security Tests', () => {
 
             it('should prevent user from modifying another user favourites', async () => {
                 // Arrange - Create two users and a place
-                const { user: user1, token: token1 } = await createAuthenticatedUser({
+                const { token: token1 } = await createAuthenticatedUser({
                     email: 'user1fav@test.com'
                 });
                 const { user: user2 } = await createAuthenticatedUser({
@@ -135,7 +135,7 @@ describe('Security Tests', () => {
 
             it('should prevent user from modifying another user settings', async () => {
                 // Arrange
-                const { user: user1, token: token1 } = await createAuthenticatedUser({
+                const { token: token1 } = await createAuthenticatedUser({
                     email: 'user1settings@test.com'
                 });
                 const { user: user2 } = await createAuthenticatedUser({
@@ -154,7 +154,7 @@ describe('Security Tests', () => {
 
             it('should prevent user from accessing another user preference profiles', async () => {
                 // Arrange
-                const { user: user1, token: token1 } = await createAuthenticatedUser({
+                const { token: token1 } = await createAuthenticatedUser({
                     email: 'user1prefs@test.com'
                 });
                 const { user: user2 } = await createAuthenticatedUser({
@@ -226,7 +226,7 @@ describe('Security Tests', () => {
         describe('XSS Prevention', () => {
             it('should sanitize XSS attempts in review comments', async () => {
                 // Arrange
-                const { user, token } = await createAuthenticatedUser({
+                const { token } = await createAuthenticatedUser({
                     email: 'xsstest@test.com'
                 });
 
@@ -256,7 +256,7 @@ describe('Security Tests', () => {
 
             it('should sanitize XSS in report descriptions', async () => {
                 // Arrange
-                const { user, token } = await createAuthenticatedUser({
+                const { token } = await createAuthenticatedUser({
                     email: 'xssreport@test.com'
                 });
 
diff --git a/tests/integration/user.test.js b/tests/integration/user.test.js
index 00d63fa..460a011 100644
--- a/tests/integration/user.test.js
+++ b/tests/integration/user.test.js
@@ -18,7 +18,7 @@
 import { api, createAuthenticatedUser, createTestUser, generateTestJWT, authRequest } from '../helpers/testUtils.js';
 
 describe('User Controller - Integration Tests', () => {
-  
+
   describe('GET /users/:userId/profile', () => {
     describe('Happy Path - Successful Retrieval Profile', () => {
       it('should return 200 and the profile of the user when is authenticated', async () => {
@@ -251,7 +251,7 @@ describe('User Controller - Integration Tests', () => {
         const { user: user1, token: token1 } = await createAuthenticatedUser({
           email: 'user1@example.com'
         });
-        const user2 = await createTestUser({ email: 'user2@example.com' });
+        await createTestUser({ email: 'user2@example.com' });
 
         // Act - User1 προσπαθεί να αλλάξει email to αυτό of the User2
         const response = await authRequest(token1)
diff --git a/tests/unit/authService.test.js b/tests/unit/authService.test.js
index 3e4dbf0..1631c54 100644
--- a/tests/unit/authService.test.js
+++ b/tests/unit/authService.test.js
@@ -217,7 +217,7 @@ describe('Auth Service', () => {
 
     it('should throw AuthenticationError if user has no password field', async () => {
       // Create user without password
-      const userNoPass = await db.createUser({
+      await db.createUser({
         name: 'No Password User',
         email: 'nopass@example.com',
         role: 'user'
@@ -264,6 +264,19 @@ describe('Auth Service', () => {
       expect(decoded.email).toBe('auth@example.com');
       expect(decoded.role).toBe('user');
     });
+
+    it('should throw AuthenticationError with expired message for expired token', async () => {
+      // Create an expired token using jwt.sign directly
+      const jwt = await import('jsonwebtoken');
+      const expiredToken = jwt.default.sign(
+        { userId: testUser.userId, email: 'auth@example.com', role: 'user' },
+        process.env.JWT_SECRET,
+        { expiresIn: '-1s' } // Already expired
+      );
+
+      expect(() => authService.verifyToken(expiredToken)).toThrow(AuthenticationError);
+      expect(() => authService.verifyToken(expiredToken)).toThrow(/expired/);
+    });
   });
 
   describe('changePassword', () => {
diff --git a/tests/unit/favouriteController.test.js b/tests/unit/favouriteController.test.js
new file mode 100644
index 0000000..6be535d
--- /dev/null
+++ b/tests/unit/favouriteController.test.js
@@ -0,0 +1,171 @@
+/**
+ * Unit Tests for Favourite Controller
+ * 
+ * Tests controller error handling by mocking the db module
+ * to throw errors, which triggers the next(error) paths.
+ */
+
+import { jest } from '@jest/globals';
+
+// Mock the db module
+const mockFindUserById = jest.fn();
+const mockFindPlaceById = jest.fn();
+const mockGetFavouritePlaces = jest.fn();
+const mockAddFavouritePlace = jest.fn();
+const mockRemoveFavouritePlace = jest.fn();
+const mockGetReviewsForPlace = jest.fn();
+const mockGetDislikedPlaces = jest.fn();
+const mockAddDislikedPlace = jest.fn();
+const mockRemoveDislikedPlace = jest.fn();
+
+jest.unstable_mockModule('../../config/db.js', () => ({
+    default: {
+        findUserById: mockFindUserById,
+        findPlaceById: mockFindPlaceById,
+        getFavouritePlaces: mockGetFavouritePlaces,
+        addFavouritePlace: mockAddFavouritePlace,
+        removeFavouritePlace: mockRemoveFavouritePlace,
+        getReviewsForPlace: mockGetReviewsForPlace,
+        getDislikedPlaces: mockGetDislikedPlaces,
+        addDislikedPlace: mockAddDislikedPlace,
+        removeDislikedPlace: mockRemoveDislikedPlace
+    }
+}));
+
+// Import controller after mocking
+const favouriteController = (await import('../../controllers/favouriteController.js')).default;
+
+describe('Favourite Controller - Error Handling', () => {
+    let mockReq;
+    let mockRes;
+    let mockNext;
+
+    beforeEach(() => {
+        jest.clearAllMocks();
+
+        mockReq = {
+            params: { userId: '1', favouriteId: '1', dislikedId: '1' },
+            body: { placeId: 1 }
+        };
+
+        mockRes = {
+            json: jest.fn(),
+            status: jest.fn().mockReturnThis(),
+            send: jest.fn()
+        };
+
+        mockNext = jest.fn();
+    });
+
+    describe('getFavouritePlaces', () => {
+        it('should call next with error when db.findUserById throws', async () => {
+            const testError = new Error('Database connection failed');
+            mockFindUserById.mockRejectedValue(testError);
+
+            await favouriteController.getFavouritePlaces(mockReq, mockRes, mockNext);
+
+            expect(mockNext).toHaveBeenCalledWith(testError);
+            expect(mockRes.json).not.toHaveBeenCalled();
+        });
+
+        it('should call next with error when db.getFavouritePlaces throws', async () => {
+            const testError = new Error('Query failed');
+            mockFindUserById.mockResolvedValue({ userId: 1 });
+            mockGetFavouritePlaces.mockRejectedValue(testError);
+
+            await favouriteController.getFavouritePlaces(mockReq, mockRes, mockNext);
+
+            expect(mockNext).toHaveBeenCalledWith(testError);
+        });
+    });
+
+    describe('addFavouritePlace', () => {
+        it('should call next with error when db operations throw', async () => {
+            const testError = new Error('Database error');
+            mockFindUserById.mockResolvedValue({ userId: 1 });
+            mockFindPlaceById.mockResolvedValue({ placeId: 1, toObject: () => ({ placeId: 1 }) });
+            mockAddFavouritePlace.mockResolvedValue({ favouriteId: 1 });
+            mockGetReviewsForPlace.mockRejectedValue(testError);
+
+            await favouriteController.addFavouritePlace(mockReq, mockRes, mockNext);
+
+            expect(mockNext).toHaveBeenCalledWith(testError);
+        });
+    });
+
+    describe('removeFavouritePlace', () => {
+        it('should call next with error when db.findUserById throws', async () => {
+            const testError = new Error('Database connection failed');
+            mockFindUserById.mockRejectedValue(testError);
+
+            await favouriteController.removeFavouritePlace(mockReq, mockRes, mockNext);
+
+            expect(mockNext).toHaveBeenCalledWith(testError);
+        });
+
+        it('should call next with error when db.removeFavouritePlace throws', async () => {
+            const testError = new Error('Delete failed');
+            mockFindUserById.mockResolvedValue({ userId: 1 });
+            mockRemoveFavouritePlace.mockRejectedValue(testError);
+
+            await favouriteController.removeFavouritePlace(mockReq, mockRes, mockNext);
+
+            expect(mockNext).toHaveBeenCalledWith(testError);
+        });
+    });
+
+    describe('getDislikedPlaces', () => {
+        it('should call next with error when db.findUserById throws', async () => {
+            const testError = new Error('Database connection failed');
+            mockFindUserById.mockRejectedValue(testError);
+
+            await favouriteController.getDislikedPlaces(mockReq, mockRes, mockNext);
+
+            expect(mockNext).toHaveBeenCalledWith(testError);
+        });
+
+        it('should call next with error when db.getDislikedPlaces throws', async () => {
+            const testError = new Error('Query failed');
+            mockFindUserById.mockResolvedValue({ userId: 1 });
+            mockGetDislikedPlaces.mockRejectedValue(testError);
+
+            await favouriteController.getDislikedPlaces(mockReq, mockRes, mockNext);
+
+            expect(mockNext).toHaveBeenCalledWith(testError);
+        });
+    });
+
+    describe('addDislikedPlace', () => {
+        it('should call next with error when db operations throw', async () => {
+            const testError = new Error('Database error');
+            mockFindUserById.mockResolvedValue({ userId: 1 });
+            mockFindPlaceById.mockResolvedValue({ placeId: 1 });
+            mockAddDislikedPlace.mockRejectedValue(testError);
+
+            await favouriteController.addDislikedPlace(mockReq, mockRes, mockNext);
+
+            expect(mockNext).toHaveBeenCalledWith(testError);
+        });
+    });
+
+    describe('removeDislikedPlace', () => {
+        it('should call next with error when db.findUserById throws', async () => {
+            const testError = new Error('Database connection failed');
+            mockFindUserById.mockRejectedValue(testError);
+
+            await favouriteController.removeDislikedPlace(mockReq, mockRes, mockNext);
+
+            expect(mockNext).toHaveBeenCalledWith(testError);
+        });
+
+        it('should call next with error when db.removeDislikedPlace throws', async () => {
+            const testError = new Error('Delete failed');
+            mockFindUserById.mockResolvedValue({ userId: 1 });
+            mockRemoveDislikedPlace.mockRejectedValue(testError);
+
+            await favouriteController.removeDislikedPlace(mockReq, mockRes, mockNext);
+
+            expect(mockNext).toHaveBeenCalledWith(testError);
+        });
+    });
+});
diff --git a/tests/unit/hateoasBuilder.test.js b/tests/unit/hateoasBuilder.test.js
index 380e682..499bb24 100644
--- a/tests/unit/hateoasBuilder.test.js
+++ b/tests/unit/hateoasBuilder.test.js
@@ -9,7 +9,7 @@ describe('HATEOAS Builder - Unit Tests', () => {
   describe('userProfile links', () => {
     it('should generate all user profile links', () => {
       const links = buildHateoasLinks.userProfile(1);
-      
+
       expect(links).toHaveProperty('self');
       expect(links.self.href).toBe('/users/1/profile');
       expect(links).toHaveProperty('edit');
@@ -23,7 +23,7 @@ describe('HATEOAS Builder - Unit Tests', () => {
   describe('settings links', () => {
     it('should generate settings links', () => {
       const links = buildHateoasLinks.settings(1);
-      
+
       expect(links.self.href).toBe('/users/1/settings');
       expect(links.update.method).toBe('PUT');
       expect(links['user-profile'].href).toBe('/users/1/profile');
@@ -33,7 +33,7 @@ describe('HATEOAS Builder - Unit Tests', () => {
   describe('preferenceProfile links', () => {
     it('should generate preference profile links', () => {
       const links = buildHateoasLinks.preferenceProfile(1, 5);
-      
+
       expect(links.self.href).toBe('/users/1/preference-profiles/5');
       expect(links.edit.href).toBe('/users/1/preference-profiles/5');
       expect(links.delete.href).toBe('/users/1/preference-profiles/5');
@@ -44,7 +44,7 @@ describe('HATEOAS Builder - Unit Tests', () => {
   describe('place links', () => {
     it('should generate place links', () => {
       const links = buildHateoasLinks.place(10);
-      
+
       expect(links.self.href).toBe('/places/10');
       expect(links['see-reviews'].href).toBe('/places/10/reviews');
       expect(links['add-review'].href).toBe('/places/10/reviews');
@@ -55,7 +55,7 @@ describe('HATEOAS Builder - Unit Tests', () => {
   describe('search links', () => {
     it('should generate search links', () => {
       const links = buildHateoasLinks.search();
-      
+
       expect(links['refine-search'].href).toBe('/places/search{?keywords}');
     });
   });
@@ -63,7 +63,7 @@ describe('HATEOAS Builder - Unit Tests', () => {
   describe('recommendations links', () => {
     it('should generate recommendations links with user ID', () => {
       const links = buildHateoasLinks.recommendations(1);
-      
+
       expect(links.refresh.href).toContain('/users/1/recommendations');
       expect(links['user-profile'].href).toBe('/users/1/profile');
     });
@@ -72,7 +72,7 @@ describe('HATEOAS Builder - Unit Tests', () => {
   describe('favourites links', () => {
     it('should generate favourites collection links', () => {
       const links = buildHateoasLinks.favouritesCollection(1);
-      
+
       expect(links.self.href).toBe('/users/1/favourite-places');
       expect(links['add-favourite'].method).toBe('POST');
       expect(links['user-profile'].href).toBe('/users/1/profile');
@@ -82,7 +82,7 @@ describe('HATEOAS Builder - Unit Tests', () => {
   describe('navigation links', () => {
     it('should generate navigation links', () => {
       const links = buildHateoasLinks.navigation();
-      
+
       expect(links['alternative-routes'].href).toContain('/navigation');
       expect(links['alternative-routes'].method).toBe('GET');
     });
@@ -91,7 +91,7 @@ describe('HATEOAS Builder - Unit Tests', () => {
   describe('admin links', () => {
     it('should generate admin report collection links', () => {
       const links = buildHateoasLinks.adminReportsCollection(1, 10);
-      
+
       expect(links.self.href).toBe('/admin/1/places/10/reports');
     });
   });
@@ -99,7 +99,7 @@ describe('HATEOAS Builder - Unit Tests', () => {
   describe('review links', () => {
     it('should generate review links with place ID', () => {
       const links = buildHateoasLinks.review(10);
-      
+
       expect(links.self.href).toBe('/places/10/reviews');
       expect(links.place.href).toBe('/places/10');
     });
@@ -108,7 +108,7 @@ describe('HATEOAS Builder - Unit Tests', () => {
   describe('disliked places links', () => {
     it('should generate disliked place links', () => {
       const links = buildHateoasLinks.dislikedPlace(1);
-      
+
       expect(links.recommendations.href).toContain('/users/1/recommendations');
       expect(links['user-profile'].href).toBe('/users/1/profile');
     });
@@ -132,4 +132,205 @@ describe('HATEOAS Builder - Unit Tests', () => {
       expect(links.reports.href).toBe('/admin/1/places/2/reports');
     });
   });
+
+  describe('placeWithWebsite links', () => {
+    it('should generate place links with website when websiteUrl is provided', () => {
+      const links = buildHateoasLinks.placeWithWebsite(10, 'https://example.com');
+
+      expect(links.self.href).toBe('/places/10');
+      expect(links.website).toBeDefined();
+      expect(links.website.href).toBe('https://example.com');
+      expect(links.website.method).toBe('GET');
+      expect(links.website.type).toBe('text/html');
+    });
+
+    it('should not include website link when websiteUrl is null', () => {
+      const links = buildHateoasLinks.placeWithWebsite(10, null);
+
+      expect(links.self.href).toBe('/places/10');
+      expect(links.website).toBeUndefined();
+    });
+
+    it('should not include website link when websiteUrl is undefined', () => {
+      const links = buildHateoasLinks.placeWithWebsite(10, undefined);
+
+      expect(links.website).toBeUndefined();
+    });
+
+    it('should not include website link when websiteUrl is empty string', () => {
+      const links = buildHateoasLinks.placeWithWebsite(10, '');
+
+      expect(links.website).toBeUndefined();
+    });
+
+    it('should include user links when userId is provided', () => {
+      const links = buildHateoasLinks.placeWithWebsite(10, 'https://example.com', 1);
+
+      expect(links.website.href).toBe('https://example.com');
+      expect(links['add-to-favourites']).toBeDefined();
+      expect(links['add-to-favourites'].href).toBe('/users/1/favourite-places');
+      expect(links['add-to-disliked']).toBeDefined();
+      expect(links['user-profile'].href).toBe('/users/1/profile');
+    });
+  });
+
+  describe('place links with userId', () => {
+    it('should include user-specific links when userId is provided', () => {
+      const links = buildHateoasLinks.place(10, 1);
+
+      expect(links.self.href).toBe('/places/10');
+      expect(links['add-to-favourites']).toBeDefined();
+      expect(links['add-to-favourites'].href).toBe('/users/1/favourite-places');
+      expect(links['add-to-favourites'].method).toBe('POST');
+      expect(links['add-to-disliked']).toBeDefined();
+      expect(links['add-to-disliked'].href).toBe('/users/1/disliked-places');
+      expect(links['user-profile']).toBeDefined();
+      expect(links['user-profile'].href).toBe('/users/1/profile');
+    });
+
+    it('should not include user links when userId is null', () => {
+      const links = buildHateoasLinks.place(10, null);
+
+      expect(links['add-to-favourites']).toBeUndefined();
+      expect(links['add-to-disliked']).toBeUndefined();
+      expect(links['user-profile']).toBeUndefined();
+    });
+  });
+
+  describe('reviews links with userId', () => {
+    it('should include user-profile link when userId is provided', () => {
+      const links = buildHateoasLinks.reviews(10, 1);
+
+      expect(links.self.href).toBe('/places/10/reviews');
+      expect(links['user-profile']).toBeDefined();
+      expect(links['user-profile'].href).toBe('/users/1/profile');
+    });
+
+    it('should not include user-profile when userId is null', () => {
+      const links = buildHateoasLinks.reviews(10, null);
+
+      expect(links['user-profile']).toBeUndefined();
+    });
+  });
+
+  describe('review links with userId', () => {
+    it('should include user-profile link when userId is provided', () => {
+      const links = buildHateoasLinks.review(10, 1);
+
+      expect(links.self.href).toBe('/places/10/reviews');
+      expect(links.place.href).toBe('/places/10');
+      expect(links['user-profile']).toBeDefined();
+      expect(links['user-profile'].href).toBe('/users/1/profile');
+    });
+  });
+
+  describe('report links', () => {
+    it('should generate report links with place ID', () => {
+      const links = buildHateoasLinks.report(10);
+
+      expect(links.place.href).toBe('/places/10');
+    });
+
+    it('should include user-profile link when userId is provided', () => {
+      const links = buildHateoasLinks.report(10, 1);
+
+      expect(links.place.href).toBe('/places/10');
+      expect(links['user-profile']).toBeDefined();
+      expect(links['user-profile'].href).toBe('/users/1/profile');
+    });
+  });
+
+  describe('search links with userId', () => {
+    it('should include user-profile link when userId is provided', () => {
+      const links = buildHateoasLinks.search(1);
+
+      expect(links['refine-search'].href).toBe('/places/search{?keywords}');
+      expect(links['user-profile']).toBeDefined();
+      expect(links['user-profile'].href).toBe('/users/1/profile');
+    });
+  });
+
+  describe('navigation links with parameters', () => {
+    it('should include destination link when placeId is provided', () => {
+      const links = buildHateoasLinks.navigation(10);
+
+      expect(links.destination).toBeDefined();
+      expect(links.destination.href).toBe('/places/10');
+      expect(links.destination.method).toBe('GET');
+    });
+
+    it('should include user-profile when userId is provided', () => {
+      const links = buildHateoasLinks.navigation(null, 1);
+
+      expect(links.destination).toBeUndefined();
+      expect(links['user-profile']).toBeDefined();
+      expect(links['user-profile'].href).toBe('/users/1/profile');
+    });
+
+    it('should include both destination and user-profile when both are provided', () => {
+      const links = buildHateoasLinks.navigation(10, 1);
+
+      expect(links.destination.href).toBe('/places/10');
+      expect(links['user-profile'].href).toBe('/users/1/profile');
+    });
+  });
+
+  describe('adminReport links', () => {
+    it('should generate admin report links', () => {
+      const links = buildHateoasLinks.adminReport(10, 1);
+
+      expect(links.place.href).toBe('/places/10');
+      expect(links['edit-place']).toBeDefined();
+      expect(links['edit-place'].href).toBe('/admin/1/places/10');
+      expect(links['edit-place'].method).toBe('PUT');
+    });
+  });
+
+  describe('favourite links', () => {
+    it('should generate favourite links with all parameters', () => {
+      const links = buildHateoasLinks.favourite(1, 5, 10);
+
+      expect(links.self.href).toBe('/users/1/favourite-places');
+      expect(links.remove).toBeDefined();
+      expect(links.remove.href).toBe('/users/1/favourite-places/5');
+      expect(links.remove.method).toBe('DELETE');
+      expect(links.place.href).toBe('/places/10');
+      expect(links['user-profile'].href).toBe('/users/1/profile');
+    });
+  });
+
+  describe('favouriteItem links', () => {
+    it('should generate favourite item links', () => {
+      const links = buildHateoasLinks.favouriteItem(1, 5, 10);
+
+      expect(links.select).toBeDefined();
+      expect(links.select.href).toBe('/places/10');
+      expect(links.select.method).toBe('GET');
+      expect(links['remove-favourite']).toBeDefined();
+      expect(links['remove-favourite'].href).toBe('/users/1/favourite-places/5');
+      expect(links['remove-favourite'].method).toBe('DELETE');
+    });
+  });
+
+  describe('selectLink', () => {
+    it('should generate select link for a place', () => {
+      const links = buildHateoasLinks.selectLink(10);
+
+      expect(links.select).toBeDefined();
+      expect(links.select.href).toBe('/places/10');
+      expect(links.select.method).toBe('GET');
+    });
+  });
+
+  describe('preferenceProfilesCollection links', () => {
+    it('should generate all collection links', () => {
+      const links = buildHateoasLinks.preferenceProfilesCollection(1);
+
+      expect(links.self.href).toBe('/users/1/preference-profiles');
+      expect(links['create-profile']).toBeDefined();
+      expect(links['create-profile'].href).toBe('/users/1/preference-profiles');
+      expect(links['create-profile'].method).toBe('POST');
+      expect(links['user-profile'].href).toBe('/users/1/profile');
+    });
+  });
 });
diff --git a/tests/unit/infrastructure.test.js b/tests/unit/infrastructure.test.js
index 6987c6c..3954f9e 100644
--- a/tests/unit/infrastructure.test.js
+++ b/tests/unit/infrastructure.test.js
@@ -10,18 +10,18 @@
 import { jest } from '@jest/globals';
 
 describe('Infrastructure - Database Connection', () => {
-  
-  let connectDB, seedInitialData, disconnectDB;
+
+  let connectDB;
   let mockMongoose;
   let originalEnv;
   let consoleErrorSpy;
-  
+
   beforeEach(async () => {
     // Save original env
     originalEnv = { ...process.env };
     // Silence expected console.error output during tests
-    consoleErrorSpy = jest.spyOn(console, 'error').mockImplementation(() => {});
-    
+    consoleErrorSpy = jest.spyOn(console, 'error').mockImplementation(() => { });
+
     // Mock mongoose
     mockMongoose = {
       connect: jest.fn(),
@@ -31,12 +31,12 @@ describe('Infrastructure - Database Connection', () => {
       },
       disconnect: jest.fn()
     };
-    
+
     // Mock the mongoose module
     jest.unstable_mockModule('mongoose', () => ({
       default: mockMongoose
     }));
-    
+
     // Mock models to avoid real DB operations
     jest.unstable_mockModule('../../models/index.js', () => ({
       default: {
@@ -44,7 +44,7 @@ describe('Infrastructure - Database Connection', () => {
         Place: { countDocuments: jest.fn().mockResolvedValue(0) }
       }
     }));
-    
+
     // Mock seedData
     jest.unstable_mockModule('../../config/seedData.js', () => ({
       default: {
@@ -53,7 +53,7 @@ describe('Infrastructure - Database Connection', () => {
       }
     }));
   });
-  
+
   afterEach(() => {
     // Restore env
     process.env = originalEnv;
@@ -62,75 +62,75 @@ describe('Infrastructure - Database Connection', () => {
     }
     jest.resetModules();
   });
-  
+
   describe('connectDB()', () => {
-    
+
     it('must  συνδέεται στο MongoDB με success', async () => {
       process.env.MONGODB_URI = 'mongodb://localhost:27017/test';
       process.env.DISABLE_SEEDING = 'true';
-      
+
       mockMongoose.connect.mockResolvedValue(undefined);
-      
+
       const database = await import('../../config/database.js');
       connectDB = database.connectDB || database.default?.connectDB;
-      
+
       await connectDB();
-      
+
       expect(mockMongoose.connect).toHaveBeenCalledWith('mongodb://localhost:27017/test');
     });
-    
+
     it('must  throw error όταν MONGODB_URI λείπει', async () => {
       delete process.env.MONGODB_URI;
       process.env.DISABLE_SEEDING = 'true';
-      
+
       const database = await import('../../config/database.js');
       connectDB = database.connectDB || database.default?.connectDB;
-      
+
       await expect(connectDB()).rejects.toThrow('MONGODB_URI is not defined');
     });
-    
+
     it('must  handle connection errors', async () => {
       process.env.MONGODB_URI = 'mongodb://invalid:27017/test';
       process.env.DISABLE_SEEDING = 'true';
-      
+
       const connectionError = new Error('Connection failed');
       mockMongoose.connect.mockRejectedValue(connectionError);
-      
+
       const database = await import('../../config/database.js');
       connectDB = database.connectDB || database.default?.connectDB;
-      
+
       await expect(connectDB()).rejects.toThrow('Connection failed');
     });
-    
+
     it('must return early αν ήδη connected', async () => {
       process.env.MONGODB_URI = 'mongodb://localhost:27017/test';
       process.env.DISABLE_SEEDING = 'true';
-      
+
       mockMongoose.connect.mockResolvedValue(undefined);
-      
+
       const database = await import('../../config/database.js');
       connectDB = database.connectDB || database.default?.connectDB;
-      
+
       // First connection
       await connectDB();
       expect(mockMongoose.connect).toHaveBeenCalledTimes(1);
-      
+
       // Second connection should skip
       await connectDB();
       expect(mockMongoose.connect).toHaveBeenCalledTimes(1); // Still 1
     });
-    
+
   });
-  
+
   // disconnectDB is handled by mongoose.connection.close in server.js shutdown
-  
+
 });
 
 describe('Infrastructure - MongoDB API Wrapper', () => {
-  
+
   let mongoDb;
   let mockModels;
-  
+
   beforeEach(async () => {
     // Mock models
     mockModels = {
@@ -152,136 +152,136 @@ describe('Infrastructure - MongoDB API Wrapper', () => {
         deleteOne: jest.fn()
       }
     };
-    
+
     jest.unstable_mockModule('../../models/index.js', () => ({
       default: mockModels
     }));
-    
+
     mongoDb = await import('../../config/mongoDb.js');
   });
-  
+
   afterEach(() => {
     jest.resetModules();
   });
-  
+
   describe('Place API', () => {
-    
+
     it('findPlaceById must call Place.findOne', async () => {
       const mockPlace = { placeId: 1, name: 'Test Place' };
       mockModels.Place.findOne.mockResolvedValue(mockPlace);
-      
+
       const result = await mongoDb.findPlaceById(1);
-      
+
       expect(mockModels.Place.findOne).toHaveBeenCalledWith({ placeId: 1 });
       expect(result).toEqual(mockPlace);
     });
-    
+
     it('getReviewsForPlace must call Review.find', async () => {
       const mockReviews = [{ reviewId: 1 }, { reviewId: 2 }];
       mockModels.Review.find.mockResolvedValue(mockReviews);
-      
+
       const result = await mongoDb.getReviewsForPlace(1);
-      
+
       expect(mockModels.Review.find).toHaveBeenCalledWith({ placeId: 1 });
       expect(result).toEqual(mockReviews);
     });
-    
+
   });
-  
+
   describe('User API', () => {
-    
+
     it('findUserById must call User.findOne', async () => {
       const mockUser = { userId: 1, name: 'Test User' };
       mockModels.User.findOne.mockResolvedValue(mockUser);
-      
+
       const result = await mongoDb.findUserById(1);
-      
+
       expect(mockModels.User.findOne).toHaveBeenCalledWith({ userId: 1 });
       expect(result).toEqual(mockUser);
     });
-    
+
     it('findUserByEmail must call User.findOne', async () => {
       const mockUser = { userId: 1, email: 'test@test.com' };
       mockModels.User.findOne.mockResolvedValue(mockUser);
-      
+
       const result = await mongoDb.findUserByEmail('test@test.com');
-      
+
       expect(mockModels.User.findOne).toHaveBeenCalledWith({ email: 'test@test.com' });
       expect(result).toEqual(mockUser);
     });
-    
+
   });
-  
+
   describe('Preference Profile API', () => {
-    
+
     it('getPreferenceProfiles must call PreferenceProfile.find', async () => {
       const mockProfiles = [{ profileId: 1 }, { profileId: 2 }];
       mockModels.PreferenceProfile.find.mockResolvedValue(mockProfiles);
-      
+
       const result = await mongoDb.getPreferenceProfiles(1);
-      
+
       expect(mockModels.PreferenceProfile.find).toHaveBeenCalledWith({ userId: 1 });
       expect(result).toEqual(mockProfiles);
     });
-    
+
     it('updatePreferenceProfile must call findOneAndUpdate', async () => {
       const mockProfile = { profileId: 1, userId: 1, categories: ['food'] };
       mockModels.PreferenceProfile.findOneAndUpdate.mockResolvedValue(mockProfile);
-      
+
       const result = await mongoDb.updatePreferenceProfile(1, 1, { categories: ['food'] });
-      
+
       expect(mockModels.PreferenceProfile.findOneAndUpdate).toHaveBeenCalled();
       expect(result).toEqual(mockProfile);
     });
-    
+
     it('deletePreferenceProfile must call deleteOne', async () => {
       mockModels.PreferenceProfile.deleteOne.mockResolvedValue({ deletedCount: 1 });
-      
+
       const result = await mongoDb.deletePreferenceProfile(1, 1);
-      
+
       expect(mockModels.PreferenceProfile.deleteOne).toHaveBeenCalledWith({ userId: 1, profileId: 1 });
       expect(result).toBe(true);
     });
-    
+
   });
-  
+
 });
 
 describe('Infrastructure - Module Exports', () => {
-  
+
   describe('routes/index.js', () => {
-    
+
     it('must  export router object', async () => {
       const routes = await import('../../routes/index.js');
       const router = routes.default;
-      
+
       expect(router).toBeDefined();
       expect(typeof router).toBe('function'); // Express Router is a function
       expect(router.stack).toBeDefined(); // Router has a stack property
     });
-    
+
     it('must  έχει mounted routes', async () => {
       const routes = await import('../../routes/index.js');
       const router = routes.default;
-      
+
       // Verify router has middleware/routes registered
       expect(router.stack.length).toBeGreaterThan(0);
     });
-    
+
   });
-  
+
   describe('models/index.js', () => {
-    
+
     it('must  export όλα τα models', async () => {
       const models = await import('../../models/index.js');
       const allModels = models.default;
-      
+
       expect(allModels).toBeDefined();
       expect(allModels.User).toBeDefined();
       expect(allModels.Place).toBeDefined();
       expect(allModels.PreferenceProfile).toBeDefined();
       expect(allModels.Review).toBeDefined();
-      
+
       // Some models may be undefined if mongoose mocking affects imports
       // Just verify the main models are present
       if (allModels.Report) {
@@ -300,180 +300,180 @@ describe('Infrastructure - Module Exports', () => {
         expect(allModels.Counter).toBeDefined();
       }
     });
-    
+
   });
-  
+
 });
 
 describe('Infrastructure - App Initialization', () => {
-  
+
   describe('app.js', () => {
-    
+
     it('must  export Express app instance', async () => {
       const appModule = await import('../../app.js');
       const app = appModule.default;
-      
+
       expect(app).toBeDefined();
       expect(typeof app).toBe('function'); // Express app is a function
       expect(app.listen).toBeDefined(); // Has listen method
     });
-    
+
     it('must  έχει middleware registered', async () => {
       const appModule = await import('../../app.js');
       const app = appModule.default;
-      
+
       // Verify app has middleware stack
       expect(app._router).toBeDefined();
       expect(app._router.stack).toBeDefined();
       expect(app._router.stack.length).toBeGreaterThan(0);
     });
-    
+
   });
-  
+
 });
 
 describe('Infrastructure - Config Files', () => {
-  
+
   describe('config/db.js', () => {
-    
+
     it('must  import χωρίς errors', async () => {
       const dbModule = await import('../../config/db.js');
       expect(dbModule).toBeDefined();
     });
-    
+
   });
-  
+
   describe('config/constants.js', () => {
-    
+
     it('must  export API_VERSION', async () => {
       const constants = await import('../../config/constants.js');
-      
+
       expect(constants.API_VERSION).toBeDefined();
       expect(typeof constants.API_VERSION).toBe('string');
     });
-    
+
     it('must  export HTTP_STATUS', async () => {
       const constants = await import('../../config/constants.js');
-      
+
       expect(constants.HTTP_STATUS).toBeDefined();
       expect(typeof constants.HTTP_STATUS).toBe('object');
     });
-    
+
   });
-  
+
 });
 
 describe('Infrastructure - Error Classes', () => {
-  
+
   describe('utils/errors.js', () => {
-    
+
     it('must  export ValidationError', async () => {
       const errors = await import('../../utils/errors.js');
-      
+
       expect(errors.ValidationError).toBeDefined();
-      
+
       const error = new errors.ValidationError('Test error');
       expect(error.message).toBe('Test error');
       expect(error.statusCode).toBe(400);
       expect(error instanceof Error).toBe(true);
     });
-    
+
     it('must  export NotFoundError', async () => {
       const errors = await import('../../utils/errors.js');
-      
+
       expect(errors.NotFoundError).toBeDefined();
-      
+
       const error = new errors.NotFoundError('User', '123');
       expect(error.message).toBe('User with ID 123 not found');
       expect(error.statusCode).toBe(404);
     });
-    
+
     it('must  export AuthenticationError', async () => {
       const errors = await import('../../utils/errors.js');
-      
+
       expect(errors.AuthenticationError).toBeDefined();
-      
+
       const error = new errors.AuthenticationError('Unauthorized');
       expect(error.message).toBe('Unauthorized');
       expect(error.statusCode).toBe(401);
     });
-    
+
     it('must  export AuthorizationError', async () => {
       const errors = await import('../../utils/errors.js');
-      
+
       expect(errors.AuthorizationError).toBeDefined();
-      
+
       const error = new errors.AuthorizationError('Forbidden');
       expect(error.message).toBe('Forbidden');
       expect(error.statusCode).toBe(403);
     });
-    
+
     it('must  export ConflictError', async () => {
       const errors = await import('../../utils/errors.js');
-      
+
       expect(errors.ConflictError).toBeDefined();
-      
+
       const error = new errors.ConflictError('Conflict');
       expect(error.message).toBe('Conflict');
       expect(error.statusCode).toBe(409);
     });
-    
+
   });
-  
+
 });
 
 describe('Infrastructure - Response Helpers', () => {
-  
+
   describe('utils/responses.js', () => {
-    
+
     it('must  export success helper', async () => {
       const responses = await import('../../utils/responses.js');
-      
+
       expect(responses.sendSuccess).toBeDefined();
       expect(typeof responses.sendSuccess).toBe('function');
     });
-    
+
     it('must  export created helper', async () => {
       const responses = await import('../../utils/responses.js');
-      
+
       expect(responses.sendCreated).toBeDefined();
       expect(typeof responses.sendCreated).toBe('function');
     });
-    
+
     it('must  export noContent helper', async () => {
       const responses = await import('../../utils/responses.js');
-      
+
       expect(responses.sendNoContent).toBeDefined();
       expect(typeof responses.sendNoContent).toBe('function');
     });
-    
+
     it('success helper must  δημιουργεί σωστό response', async () => {
       const responses = await import('../../utils/responses.js');
-      
+
       const mockRes = {
         status: jest.fn().mockReturnThis(),
         json: jest.fn()
       };
-      
+
       responses.sendSuccess(mockRes, { message: 'Success' });
-      
+
       expect(mockRes.status).toHaveBeenCalledWith(200);
       expect(mockRes.json).toHaveBeenCalledWith({
         success: true,
         data: { message: 'Success' }
       });
     });
-    
+
     it('created helper must  δημιουργεί σωστό response', async () => {
       const responses = await import('../../utils/responses.js');
-      
+
       const mockRes = {
         status: jest.fn().mockReturnThis(),
         json: jest.fn()
       };
-      
+
       responses.sendCreated(mockRes, { id: 1 }, 'Created successfully');
-      
+
       expect(mockRes.status).toHaveBeenCalledWith(201);
       expect(mockRes.json).toHaveBeenCalledWith({
         success: true,
@@ -481,27 +481,27 @@ describe('Infrastructure - Response Helpers', () => {
         data: { id: 1 }
       });
     });
-    
+
   });
-  
+
 });
 
 describe('Infrastructure - HATEOAS Builder', () => {
-  
+
   describe('utils/hateoasBuilder.js', () => {
-    
+
     it('must  import χωρίς errors', async () => {
       const hateoas = await import('../../utils/hateoasBuilder.js');
       expect(hateoas).toBeDefined();
     });
-    
+
     it('must  export buildHateoasLinks object', async () => {
       // HateoasBuilder exports buildHateoasLinks object with methods
       // Just verify the file loads successfully
       const hateoas = await import('../../utils/hateoasBuilder.js');
       expect(hateoas.default).toBeDefined();
     });
-    
+
   });
-  
+
 });
diff --git a/tests/unit/middleware.simple.test.js b/tests/unit/middleware.simple.test.js
index 06b36f3..615d322 100644
--- a/tests/unit/middleware.simple.test.js
+++ b/tests/unit/middleware.simple.test.js
@@ -4,7 +4,7 @@
 
 import errorHandler from '../../middleware/errorHandler.js';
 import { validate } from '../../middleware/validation.js';
-import { APIError, ValidationError, NotFoundError } from '../../utils/errors.js';
+import { APIError, NotFoundError } from '../../utils/errors.js';
 
 // Simple mock for Express objects
 const createMockReq = () => ({
@@ -19,17 +19,17 @@ const createMockRes = () => {
   const res = {};
   res.statusCode = 200;
   res.jsonData = null;
-  
-  res.status = function(code) {
+
+  res.status = function (code) {
     this.statusCode = code;
     return this;
   };
-  
-  res.json = function(data) {
+
+  res.json = function (data) {
     this.jsonData = data;
     return this;
   };
-  
+
   return res;
 };
 
@@ -43,290 +43,290 @@ const createMockNext = () => {
 };
 
 describe('Error Handler Middleware - Simple Unit Tests', () => {
-  
+
   // Save original console.error
   let originalConsoleError;
-  
+
   beforeEach(() => {
     originalConsoleError = console.error;
-    console.error = () => {}; // Silence error logs during tests
+    console.error = () => { }; // Silence error logs during tests
   });
-  
+
   afterEach(() => {
     console.error = originalConsoleError;
   });
-  
+
   describe('APIError Handling', () => {
-    
+
     it('should include field details', () => {
       const error = new APIError('VALIDATION_ERROR', 'Invalid field', 400);
       error.field = 'email';
       error.value = 'invalid@';
-      
+
       const req = createMockReq();
       const res = createMockRes();
       const next = createMockNext();
-      
+
       errorHandler(error, req, res, next);
-      
+
       expect(res.jsonData.details.field).toBe('email');
       expect(res.jsonData.details.value).toBe('invalid@');
     });
-    
+
     it('should include resource details', () => {
       const error = new NotFoundError('User');
-      
+
       const req = createMockReq();
       const res = createMockRes();
       const next = createMockNext();
-      
+
       errorHandler(error, req, res, next);
-      
+
       expect(res.statusCode).toBe(404);
       expect(res.jsonData.details.resource).toBe('User');
     });
-    
+
   });
-  
+
   describe('MongoDB Errors', () => {
-    
+
     it('should handle duplicate key error (11000)', () => {
       const error = {
         code: 11000,
         keyPattern: { email: 1 }
       };
-      
+
       const req = createMockReq();
       const res = createMockRes();
       const next = createMockNext();
-      
+
       errorHandler(error, req, res, next);
-      
+
       expect(res.statusCode).toBe(409);
       expect(res.jsonData.error).toBe('DUPLICATE_KEY');
       expect(res.jsonData.message).toBe('A record with this information already exists');
       expect(res.jsonData.details.field).toBe('email');
     });
-    
+
     it('should handle duplicate key without keyPattern', () => {
       const error = { code: 11000 };
-      
+
       const req = createMockReq();
       const res = createMockRes();
       const next = createMockNext();
-      
+
       errorHandler(error, req, res, next);
-      
+
       expect(res.statusCode).toBe(409);
       expect(res.jsonData.details.field).toBeUndefined();
     });
-    
+
   });
-  
+
   describe('Mongoose Validation Errors', () => {
-    
+
     it('should handle ValidationError', () => {
       const error = new Error('Validation failed');
       error.name = 'ValidationError';
       error.details = { field: 'age', message: 'Must be positive' };
-      
+
       const req = createMockReq();
       const res = createMockRes();
       const next = createMockNext();
-      
+
       errorHandler(error, req, res, next);
-      
+
       expect(res.statusCode).toBe(400);
       expect(res.jsonData.error).toBe('VALIDATION_ERROR');
       expect(res.jsonData.details).toEqual({ field: 'age', message: 'Must be positive' });
     });
-    
+
     it('should handle ValidationError without details', () => {
       const error = new Error('Validation failed');
       error.name = 'ValidationError';
-      
+
       const req = createMockReq();
       const res = createMockRes();
       const next = createMockNext();
-      
+
       errorHandler(error, req, res, next);
-      
+
       expect(res.jsonData.details).toEqual({});
     });
-    
+
   });
-  
+
   describe('JWT Errors', () => {
-    
+
     it('should handle JsonWebTokenError', () => {
       const error = new Error('Invalid token');
       error.name = 'JsonWebTokenError';
-      
+
       const req = createMockReq();
       const res = createMockRes();
       const next = createMockNext();
-      
+
       errorHandler(error, req, res, next);
-      
+
       expect(res.statusCode).toBe(401);
       expect(res.jsonData.error).toBe('INVALID_TOKEN');
       expect(res.jsonData.message).toBe('Authentication token is invalid');
     });
-    
+
     it('should handle TokenExpiredError', () => {
       const error = new Error('Token expired');
       error.name = 'TokenExpiredError';
-      
+
       const req = createMockReq();
       const res = createMockRes();
       const next = createMockNext();
-      
+
       errorHandler(error, req, res, next);
-      
+
       expect(res.statusCode).toBe(401);
       expect(res.jsonData.error).toBe('TOKEN_EXPIRED');
       expect(res.jsonData.message).toBe('Authentication token has expired');
     });
-    
+
   });
-  
+
   describe('Custom Errors with statusCode', () => {
-    
+
     it('should handle error with statusCode property', () => {
       const error = new Error('Custom error');
       error.statusCode = 418;
       error.error = 'TEAPOT';
       error.details = { info: 'I am a teapot' };
-      
+
       const req = createMockReq();
       const res = createMockRes();
       const next = createMockNext();
-      
+
       errorHandler(error, req, res, next);
-      
+
       expect(res.statusCode).toBe(418);
       expect(res.jsonData.error).toBe('TEAPOT');
       expect(res.jsonData.details).toEqual({ info: 'I am a teapot' });
     });
-    
+
     it('should use default error code if missing', () => {
       const error = new Error('Error without code');
       error.statusCode = 400;
-      
+
       const req = createMockReq();
       const res = createMockRes();
       const next = createMockNext();
-      
+
       errorHandler(error, req, res, next);
-      
+
       expect(res.jsonData.error).toBe('API_ERROR');
     });
-    
+
     it('should use empty details if missing', () => {
       const error = new Error('Error');
       error.statusCode = 400;
-      
+
       const req = createMockReq();
       const res = createMockRes();
       const next = createMockNext();
-      
+
       errorHandler(error, req, res, next);
-      
+
       expect(res.jsonData.details).toEqual({});
     });
-    
+
   });
-  
+
   describe('Generic Errors (500)', () => {
-    
+
     it('should return 500 for unknown errors', () => {
       const error = new Error('Something unexpected happened');
-      
+
       const req = createMockReq();
       const res = createMockRes();
       const next = createMockNext();
-      
+
       // Set NODE_ENV to production to avoid stack trace
       const originalEnv = process.env.NODE_ENV;
       process.env.NODE_ENV = 'production';
-      
+
       errorHandler(error, req, res, next);
-      
+
       expect(res.statusCode).toBe(500);
       expect(res.jsonData.error).toBe('INTERNAL_SERVER_ERROR');
       expect(res.jsonData.message).toBe('An unexpected error occurred');
       expect(res.jsonData.data).toBe(null);
-      
+
       process.env.NODE_ENV = originalEnv;
     });
-    
+
     it('should include stack trace in development mode', () => {
       const error = new Error('Dev error');
-      
+
       const req = createMockReq();
       const res = createMockRes();
       const next = createMockNext();
-      
+
       // Set NODE_ENV to development
       const originalEnv = process.env.NODE_ENV;
       process.env.NODE_ENV = 'development';
-      
+
       errorHandler(error, req, res, next);
-      
+
       expect(res.jsonData.stack).toBeDefined();
       expect(typeof res.jsonData.stack).toBe('string');
-      
+
       process.env.NODE_ENV = originalEnv;
     });
-    
+
   });
-  
+
   describe('Console Logging', () => {
-    
+
     it('should log the error to console', () => {
       let errorLogged = false;
       let loggedMessage = null;
-      
+
       // Temporarily capture console.error
       const originalError = console.error;
-      console.error = (msg, err) => {
+      console.error = (msg) => {
         errorLogged = true;
         loggedMessage = msg;
       };
-      
+
       const error = new Error('Test error');
       const req = createMockReq();
       const res = createMockRes();
       const next = createMockNext();
-      
+
       errorHandler(error, req, res, next);
-      
+
       expect(errorLogged).toBe(true);
       expect(loggedMessage).toBe('Error:');
-      
+
       console.error = originalError;
     });
-    
+
   });
-  
+
 });
 
 describe('Validation Middleware - Simple Unit Tests', () => {
-  
+
   describe('validate() function', () => {
-    
+
     it('should be function', () => {
       expect(typeof validate).toBe('function');
     });
-    
+
     it('should accept 3 parameters (req, res, next)', () => {
       expect(validate.length).toBe(3);
     });
-    
+
     // Note: Full testing of validate() would require mocking validationResult
     // from express-validator, which is more complex. Validate is called
     // indirectly through integration tests, so it has coverage there.
-    
+
   });
-  
+
 });
diff --git a/tests/unit/preferenceController.test.js b/tests/unit/preferenceController.test.js
new file mode 100644
index 0000000..94985d5
--- /dev/null
+++ b/tests/unit/preferenceController.test.js
@@ -0,0 +1,177 @@
+/**
+ * Unit Tests for Preference Controller
+ * 
+ * Tests controller error handling by mocking the db module
+ * to throw errors, which triggers the next(error) paths.
+ */
+
+import { jest } from '@jest/globals';
+
+// Mock the db module
+const mockFindUserById = jest.fn();
+const mockGetPreferenceProfiles = jest.fn();
+const mockGetPreferenceProfile = jest.fn();
+const mockAddPreferenceProfile = jest.fn();
+const mockUpdatePreferenceProfile = jest.fn();
+const mockDeletePreferenceProfile = jest.fn();
+const mockUpdateUserById = jest.fn();
+
+jest.unstable_mockModule('../../config/db.js', () => ({
+    default: {
+        findUserById: mockFindUserById,
+        getPreferenceProfiles: mockGetPreferenceProfiles,
+        getPreferenceProfile: mockGetPreferenceProfile,
+        addPreferenceProfile: mockAddPreferenceProfile,
+        updatePreferenceProfile: mockUpdatePreferenceProfile,
+        deletePreferenceProfile: mockDeletePreferenceProfile,
+        updateUserById: mockUpdateUserById
+    }
+}));
+
+// Import controller after mocking
+const preferenceController = (await import('../../controllers/preferenceController.js')).default;
+
+describe('Preference Controller - Error Handling', () => {
+    let mockReq;
+    let mockRes;
+    let mockNext;
+
+    beforeEach(() => {
+        jest.clearAllMocks();
+
+        mockReq = {
+            params: { userId: '1', profileId: '1' },
+            body: { categories: ['MUSEUM'] }
+        };
+
+        mockRes = {
+            json: jest.fn(),
+            status: jest.fn().mockReturnThis(),
+            send: jest.fn()
+        };
+
+        mockNext = jest.fn();
+    });
+
+    describe('getPreferenceProfiles', () => {
+        it('should call next with error when db.findUserById throws', async () => {
+            const testError = new Error('Database connection failed');
+            mockFindUserById.mockRejectedValue(testError);
+
+            await preferenceController.getPreferenceProfiles(mockReq, mockRes, mockNext);
+
+            expect(mockNext).toHaveBeenCalledWith(testError);
+            expect(mockRes.json).not.toHaveBeenCalled();
+        });
+
+        it('should call next with error when db.getPreferenceProfiles throws', async () => {
+            const testError = new Error('Query failed');
+            mockFindUserById.mockResolvedValue({ userId: 1 });
+            mockGetPreferenceProfiles.mockRejectedValue(testError);
+
+            await preferenceController.getPreferenceProfiles(mockReq, mockRes, mockNext);
+
+            expect(mockNext).toHaveBeenCalledWith(testError);
+        });
+    });
+
+    describe('createPreferenceProfile', () => {
+        it('should call next with error when db.findUserById throws', async () => {
+            const testError = new Error('Database connection failed');
+            mockFindUserById.mockRejectedValue(testError);
+
+            await preferenceController.createPreferenceProfile(mockReq, mockRes, mockNext);
+
+            expect(mockNext).toHaveBeenCalledWith(testError);
+        });
+
+        it('should call next with error when db.addPreferenceProfile throws', async () => {
+            const testError = new Error('Insert failed');
+            mockFindUserById.mockResolvedValue({ userId: 1 });
+            mockGetPreferenceProfiles.mockResolvedValue([]);
+            mockAddPreferenceProfile.mockRejectedValue(testError);
+
+            await preferenceController.createPreferenceProfile(mockReq, mockRes, mockNext);
+
+            expect(mockNext).toHaveBeenCalledWith(testError);
+        });
+    });
+
+    describe('updatePreferenceProfile', () => {
+        it('should call next with error when db.findUserById throws', async () => {
+            const testError = new Error('Database connection failed');
+            mockFindUserById.mockRejectedValue(testError);
+            mockReq.body = { name: 'Updated' };
+
+            await preferenceController.updatePreferenceProfile(mockReq, mockRes, mockNext);
+
+            expect(mockNext).toHaveBeenCalledWith(testError);
+        });
+
+        it('should call next with error when db.updatePreferenceProfile throws', async () => {
+            const testError = new Error('Update failed');
+            mockFindUserById.mockResolvedValue({ userId: 1 });
+            mockGetPreferenceProfile.mockResolvedValue({ profileId: 1, categories: ['MUSEUM'] });
+            mockUpdatePreferenceProfile.mockRejectedValue(testError);
+            mockReq.body = { name: 'Updated' };
+
+            await preferenceController.updatePreferenceProfile(mockReq, mockRes, mockNext);
+
+            expect(mockNext).toHaveBeenCalledWith(testError);
+        });
+    });
+
+    describe('deletePreferenceProfile', () => {
+        it('should call next with error when db.findUserById throws', async () => {
+            const testError = new Error('Database connection failed');
+            mockFindUserById.mockRejectedValue(testError);
+
+            await preferenceController.deletePreferenceProfile(mockReq, mockRes, mockNext);
+
+            expect(mockNext).toHaveBeenCalledWith(testError);
+        });
+
+        it('should call next with error when db.deletePreferenceProfile throws', async () => {
+            const testError = new Error('Delete failed');
+            mockFindUserById.mockResolvedValue({ userId: 1 });
+            mockDeletePreferenceProfile.mockRejectedValue(testError);
+
+            await preferenceController.deletePreferenceProfile(mockReq, mockRes, mockNext);
+
+            expect(mockNext).toHaveBeenCalledWith(testError);
+        });
+    });
+
+    describe('activatePreferenceProfile', () => {
+        it('should call next with error when db.findUserById throws', async () => {
+            const testError = new Error('Database connection failed');
+            mockFindUserById.mockRejectedValue(testError);
+
+            await preferenceController.activatePreferenceProfile(mockReq, mockRes, mockNext);
+
+            expect(mockNext).toHaveBeenCalledWith(testError);
+        });
+
+        it('should call next with error when db.getPreferenceProfiles throws', async () => {
+            const testError = new Error('Query failed');
+            mockFindUserById.mockResolvedValue({ userId: 1 });
+            mockGetPreferenceProfiles.mockRejectedValue(testError);
+
+            await preferenceController.activatePreferenceProfile(mockReq, mockRes, mockNext);
+
+            expect(mockNext).toHaveBeenCalledWith(testError);
+        });
+
+        it('should call next with error when db.updateUserById throws', async () => {
+            const testError = new Error('Update failed');
+            mockFindUserById.mockResolvedValue({ userId: 1 });
+            // First call returns profile to find
+            mockGetPreferenceProfiles.mockResolvedValueOnce([{ profileId: 1, categories: ['MUSEUM'] }]);
+            mockUpdateUserById.mockRejectedValue(testError);
+
+            await preferenceController.activatePreferenceProfile(mockReq, mockRes, mockNext);
+
+            expect(mockNext).toHaveBeenCalledWith(testError);
+        });
+    });
+});
diff --git a/tests/unit/rateLimiter.test.js b/tests/unit/rateLimiter.test.js
new file mode 100644
index 0000000..0d215f4
--- /dev/null
+++ b/tests/unit/rateLimiter.test.js
@@ -0,0 +1,52 @@
+/**
+ * Unit Tests for Rate Limiter Middleware
+ * Tests authLimiter and apiLimiter configurations
+ */
+
+import { authLimiter, apiLimiter } from '../../middleware/rateLimiter.js';
+import rateLimiterDefault from '../../middleware/rateLimiter.js';
+
+describe('Rate Limiter Middleware - Unit Tests', () => {
+    describe('authLimiter', () => {
+        it('should be defined and be a function', () => {
+            expect(authLimiter).toBeDefined();
+            expect(typeof authLimiter).toBe('function');
+        });
+
+        it('should be exported as part of the default export', () => {
+            expect(rateLimiterDefault.authLimiter).toBe(authLimiter);
+        });
+    });
+
+    describe('apiLimiter', () => {
+        it('should be defined and be a function', () => {
+            expect(apiLimiter).toBeDefined();
+            expect(typeof apiLimiter).toBe('function');
+        });
+
+        it('should be exported as part of the default export', () => {
+            expect(rateLimiterDefault.apiLimiter).toBe(apiLimiter);
+        });
+    });
+
+    describe('default export', () => {
+        it('should contain both authLimiter and apiLimiter', () => {
+            expect(rateLimiterDefault).toHaveProperty('authLimiter');
+            expect(rateLimiterDefault).toHaveProperty('apiLimiter');
+        });
+    });
+
+    describe('test environment behavior', () => {
+        // In test environment, rate limiting is disabled (max: 0)
+        // We test the configuration by examining the limiter properties
+
+        it('authLimiter should have expected configuration structure', () => {
+            // Rate limiters are middleware functions
+            expect(authLimiter.length).toBeGreaterThanOrEqual(0);
+        });
+
+        it('apiLimiter should have expected configuration structure', () => {
+            expect(apiLimiter.length).toBeGreaterThanOrEqual(0);
+        });
+    });
+});
diff --git a/tests/unit/responses.test.js b/tests/unit/responses.test.js
index d3d3f7f..7a2db97 100644
--- a/tests/unit/responses.test.js
+++ b/tests/unit/responses.test.js
@@ -16,7 +16,7 @@ import {
   sendPaginatedResponse
 } from '../../utils/responses.js';
 
-import { HTTP_STATUS } from '../../config/constants.js';
+// HTTP_STATUS not used in tests, responses.js tested via function calls
 
 // Simple mock για Express Response
 const createMockRes = () => {
@@ -24,283 +24,283 @@ const createMockRes = () => {
   res.statusCode = 200;
   res.jsonData = null;
   res.sendCalled = false;
-  
-  res.status = function(code) {
+
+  res.status = function (code) {
     this.statusCode = code;
     return this;
   };
-  
-  res.json = function(data) {
+
+  res.json = function (data) {
     this.jsonData = data;
     return this;
   };
-  
-  res.send = function() {
+
+  res.send = function () {
     this.sendCalled = true;
     return this;
   };
-  
+
   return res;
 };
 
 describe('Response Utilities - Unit Tests', () => {
-  
+
   describe('sendSuccess()', () => {
-    
+
     describe('Happy Path - Success Responses', () => {
-      
+
       it('should return 200 με data', () => {
         const res = createMockRes();
         const testData = { userId: 1, username: 'test' };
-        
+
         sendSuccess(res, testData);
-        
+
         expect(res.statusCode).toBe(200);
         expect(res.jsonData.success).toBe(true);
         expect(res.jsonData.data).toEqual(testData);
       });
-      
+
       it('should accept custom status code', () => {
         const res = createMockRes();
-        
+
         sendSuccess(res, { message: 'ok' }, 202);
-        
+
         expect(res.statusCode).toBe(202);
         expect(res.jsonData.success).toBe(true);
       });
-      
+
       it('should include meta when provided', () => {
         const res = createMockRes();
         const meta = { page: 1, total: 100 };
-        
+
         sendSuccess(res, [], 200, meta);
-        
+
         expect(res.jsonData.meta).toEqual(meta);
       });
-      
+
       it('should NOT include meta when null', () => {
         const res = createMockRes();
-        
+
         sendSuccess(res, { test: 'data' });
-        
+
         expect(res.jsonData.meta).toBeUndefined();
       });
-      
+
     });
-    
+
   });
-  
+
   describe('sendCreated()', () => {
-    
+
     it('should return 201 με success message', () => {
       const res = createMockRes();
       const newResource = { id: 123, name: 'New Resource' };
-      
+
       sendCreated(res, newResource);
-      
+
       expect(res.statusCode).toBe(201);
       expect(res.jsonData.success).toBe(true);
       expect(res.jsonData.data).toEqual(newResource);
       expect(res.jsonData.message).toBe('Resource created successfully');
     });
-    
+
     it('should accept custom message', () => {
       const res = createMockRes();
-      
+
       sendCreated(res, { id: 1 }, 'User created!');
-      
+
       expect(res.jsonData.message).toBe('User created!');
     });
-    
+
   });
-  
+
   describe('sendNoContent()', () => {
-    
+
     it('should return 204 without body', () => {
       const res = createMockRes();
-      
+
       sendNoContent(res);
-      
+
       expect(res.statusCode).toBe(204);
       expect(res.sendCalled).toBe(true);
     });
-    
+
   });
-  
+
   describe('sendError()', () => {
-    
+
     describe('Happy Path - Error Responses', () => {
-      
+
       it('should return error με status code', () => {
         const res = createMockRes();
-        
+
         sendError(res, 'TEST_ERROR', 'Something went wrong', 400);
-        
+
         expect(res.statusCode).toBe(400);
         expect(res.jsonData.success).toBe(false);
         expect(res.jsonData.error).toBe('TEST_ERROR');
         expect(res.jsonData.message).toBe('Something went wrong');
       });
-      
+
       it('should use 500 as default status', () => {
         const res = createMockRes();
-        
+
         sendError(res, 'ERROR', 'Error message');
-        
+
         expect(res.statusCode).toBe(500);
       });
-      
+
       it('should include details when provided', () => {
         const res = createMockRes();
         const details = { field: 'email', value: 'invalid' };
-        
+
         sendError(res, 'VALIDATION', 'Invalid email', 400, details);
-        
+
         expect(res.jsonData.details).toEqual(details);
       });
-      
+
       it('should NOT include details when null', () => {
         const res = createMockRes();
-        
+
         sendError(res, 'ERROR', 'Message', 400);
-        
+
         expect(res.jsonData.details).toBeUndefined();
       });
-      
+
     });
-    
+
   });
-  
+
   describe('sendValidationError()', () => {
-    
+
     it('should return 400 με VALIDATION_ERROR', () => {
       const res = createMockRes();
-      
+
       sendValidationError(res, 'Validation failed');
-      
+
       expect(res.statusCode).toBe(400);
       expect(res.jsonData.error).toBe('VALIDATION_ERROR');
       expect(res.jsonData.message).toBe('Validation failed');
     });
-    
+
     it('should include validation details', () => {
       const res = createMockRes();
       const details = { errors: [{ field: 'email', message: 'Invalid' }] };
-      
+
       sendValidationError(res, 'Validation failed', details);
-      
+
       expect(res.jsonData.details).toEqual(details);
     });
-    
+
   });
-  
+
   describe('sendAuthError()', () => {
-    
+
     it('should return 401 με AUTHENTICATION_ERROR', () => {
       const res = createMockRes();
-      
+
       sendAuthError(res);
-      
+
       expect(res.statusCode).toBe(401);
       expect(res.jsonData.error).toBe('AUTHENTICATION_ERROR');
       expect(res.jsonData.message).toBe('Authentication required');
     });
-    
+
     it('should accept custom message', () => {
       const res = createMockRes();
-      
+
       sendAuthError(res, 'Invalid credentials');
-      
+
       expect(res.jsonData.message).toBe('Invalid credentials');
     });
-    
+
   });
-  
+
   describe('sendForbiddenError()', () => {
-    
+
     it('should return 403 με AUTHORIZATION_ERROR', () => {
       const res = createMockRes();
-      
+
       sendForbiddenError(res);
-      
+
       expect(res.statusCode).toBe(403);
       expect(res.jsonData.error).toBe('AUTHORIZATION_ERROR');
       expect(res.jsonData.message).toBe('Access denied');
     });
-    
+
     it('should accept custom message', () => {
       const res = createMockRes();
-      
+
       sendForbiddenError(res, 'Admin access required');
-      
+
       expect(res.jsonData.message).toBe('Admin access required');
     });
-    
+
   });
-  
+
   describe('sendNotFoundError()', () => {
-    
+
     it('should return 404 με NOT_FOUND', () => {
       const res = createMockRes();
-      
+
       sendNotFoundError(res, 'User');
-      
+
       expect(res.statusCode).toBe(404);
       expect(res.jsonData.error).toBe('NOT_FOUND');
       expect(res.jsonData.message).toBe('User not found');
     });
-    
+
     it('should include identifier in message', () => {
       const res = createMockRes();
-      
+
       sendNotFoundError(res, 'User', 123);
-      
+
       expect(res.jsonData.message).toBe('User with ID 123 not found');
     });
-    
+
     it('should handle null identifier', () => {
       const res = createMockRes();
-      
+
       sendNotFoundError(res, 'Resource', null);
-      
+
       expect(res.jsonData.message).toBe('Resource not found');
     });
-    
+
   });
-  
+
   describe('sendConflictError()', () => {
-    
+
     it('should return 409 με CONFLICT', () => {
       const res = createMockRes();
-      
+
       sendConflictError(res, 'Email already exists');
-      
+
       expect(res.statusCode).toBe(409);
       expect(res.jsonData.error).toBe('CONFLICT');
       expect(res.jsonData.message).toBe('Email already exists');
     });
-    
+
     it('should include conflict details', () => {
       const res = createMockRes();
       const details = { field: 'email', value: 'test@example.com' };
-      
+
       sendConflictError(res, 'Duplicate email', details);
-      
+
       expect(res.jsonData.details).toEqual(details);
     });
-    
+
   });
-  
+
   describe('sendPaginatedResponse()', () => {
-    
+
     describe('Happy Path - Paginated Data', () => {
-      
+
       it('should return paginated data με meta', () => {
         const res = createMockRes();
         const items = [{ id: 1 }, { id: 2 }, { id: 3 }];
-        
+
         sendPaginatedResponse(res, items, 1, 10, 30);
-        
+
         expect(res.jsonData.success).toBe(true);
         expect(res.jsonData.data).toEqual(items);
         expect(res.jsonData.meta.page).toBe(1);
@@ -308,63 +308,63 @@ describe('Response Utilities - Unit Tests', () => {
         expect(res.jsonData.meta.total).toBe(30);
         expect(res.jsonData.meta.totalPages).toBe(3);
       });
-      
+
       it('should calculate correctly the totalPages', () => {
         const res = createMockRes();
-        
+
         sendPaginatedResponse(res, [], 1, 10, 25);
-        
+
         expect(res.jsonData.meta.totalPages).toBe(3); // Math.ceil(25/10)
       });
-      
+
       it('should show hasNextPage correctly', () => {
         const res1 = createMockRes();
         const res2 = createMockRes();
-        
+
         sendPaginatedResponse(res1, [], 1, 10, 30);
         sendPaginatedResponse(res2, [], 3, 10, 30);
-        
+
         expect(res1.jsonData.meta.hasNextPage).toBe(true);
         expect(res2.jsonData.meta.hasNextPage).toBe(false);
       });
-      
+
       it('should show hasPrevPage correctly', () => {
         const res1 = createMockRes();
         const res2 = createMockRes();
-        
+
         sendPaginatedResponse(res1, [], 1, 10, 30);
         sendPaginatedResponse(res2, [], 2, 10, 30);
-        
+
         expect(res1.jsonData.meta.hasPrevPage).toBe(false);
         expect(res2.jsonData.meta.hasPrevPage).toBe(true);
       });
-      
+
     });
-    
+
     describe('Edge Cases', () => {
-      
+
       it('should handle empty results', () => {
         const res = createMockRes();
-        
+
         sendPaginatedResponse(res, [], 1, 10, 0);
-        
+
         expect(res.jsonData.data).toEqual([]);
         expect(res.jsonData.meta.total).toBe(0);
         expect(res.jsonData.meta.totalPages).toBe(0);
       });
-      
+
       it('should handle single page', () => {
         const res = createMockRes();
-        
+
         sendPaginatedResponse(res, [1, 2, 3], 1, 10, 3);
-        
+
         expect(res.jsonData.meta.totalPages).toBe(1);
         expect(res.jsonData.meta.hasNextPage).toBe(false);
         expect(res.jsonData.meta.hasPrevPage).toBe(false);
       });
-      
+
     });
-    
+
   });
-  
+
 });
diff --git a/tests/unit/userController.test.js b/tests/unit/userController.test.js
new file mode 100644
index 0000000..279f011
--- /dev/null
+++ b/tests/unit/userController.test.js
@@ -0,0 +1,168 @@
+/**
+ * Unit Tests for User Controller
+ * 
+ * Tests controller error handling by mocking the userService
+ * to throw errors, which triggers the next(error) paths.
+ */
+
+import { jest } from '@jest/globals';
+
+// Mock the userService module
+const mockGetUserProfile = jest.fn();
+const mockUpdateUserProfile = jest.fn();
+const mockGetUserSettings = jest.fn();
+const mockUpdateUserSettings = jest.fn();
+
+jest.unstable_mockModule('../../services/userService.js', () => ({
+    getUserProfile: mockGetUserProfile,
+    updateUserProfile: mockUpdateUserProfile,
+    getUserSettings: mockGetUserSettings,
+    updateUserSettings: mockUpdateUserSettings,
+    default: {
+        getUserProfile: mockGetUserProfile,
+        updateUserProfile: mockUpdateUserProfile,
+        getUserSettings: mockGetUserSettings,
+        updateUserSettings: mockUpdateUserSettings
+    }
+}));
+
+// Import controller after mocking
+const userController = (await import('../../controllers/userController.js')).default;
+
+describe('User Controller - Error Handling', () => {
+    let mockReq;
+    let mockRes;
+    let mockNext;
+
+    beforeEach(() => {
+        jest.clearAllMocks();
+
+        mockReq = {
+            params: { userId: '1' },
+            body: {}
+        };
+
+        mockRes = {
+            json: jest.fn(),
+            status: jest.fn().mockReturnThis()
+        };
+
+        mockNext = jest.fn();
+    });
+
+    describe('getUserProfile', () => {
+        it('should call next with error when userService throws', async () => {
+            const testError = new Error('Database connection failed');
+            mockGetUserProfile.mockRejectedValue(testError);
+
+            await userController.getUserProfile(mockReq, mockRes, mockNext);
+
+            expect(mockNext).toHaveBeenCalledWith(testError);
+            expect(mockRes.json).not.toHaveBeenCalled();
+        });
+
+        it('should return user profile on success', async () => {
+            const mockUser = { userId: 1, name: 'Test User', email: 'test@example.com' };
+            mockGetUserProfile.mockResolvedValue(mockUser);
+
+            await userController.getUserProfile(mockReq, mockRes, mockNext);
+
+            expect(mockRes.json).toHaveBeenCalledWith(
+                expect.objectContaining({
+                    success: true,
+                    data: expect.objectContaining({
+                        user: mockUser
+                    })
+                })
+            );
+            expect(mockNext).not.toHaveBeenCalled();
+        });
+    });
+
+    describe('updateUserProfile', () => {
+        it('should call next with error when userService throws', async () => {
+            const testError = new Error('Update failed');
+            mockUpdateUserProfile.mockRejectedValue(testError);
+            mockReq.body = { name: 'New Name' };
+
+            await userController.updateUserProfile(mockReq, mockRes, mockNext);
+
+            expect(mockNext).toHaveBeenCalledWith(testError);
+            expect(mockRes.json).not.toHaveBeenCalled();
+        });
+
+        it('should return updated user on success', async () => {
+            const mockUpdatedUser = { userId: 1, name: 'Updated Name' };
+            mockUpdateUserProfile.mockResolvedValue(mockUpdatedUser);
+            mockReq.body = { name: 'Updated Name' };
+
+            await userController.updateUserProfile(mockReq, mockRes, mockNext);
+
+            expect(mockRes.json).toHaveBeenCalledWith(
+                expect.objectContaining({
+                    success: true,
+                    message: 'User profile updated successfully'
+                })
+            );
+            expect(mockNext).not.toHaveBeenCalled();
+        });
+    });
+
+    describe('getSettings', () => {
+        it('should call next with error when userService throws', async () => {
+            const testError = new Error('Settings fetch failed');
+            mockGetUserSettings.mockRejectedValue(testError);
+
+            await userController.getSettings(mockReq, mockRes, mockNext);
+
+            expect(mockNext).toHaveBeenCalledWith(testError);
+            expect(mockRes.json).not.toHaveBeenCalled();
+        });
+
+        it('should return settings on success', async () => {
+            const mockSettings = { userId: 1, preferredLanguage: 'ENGLISH' };
+            mockGetUserSettings.mockResolvedValue(mockSettings);
+
+            await userController.getSettings(mockReq, mockRes, mockNext);
+
+            expect(mockRes.json).toHaveBeenCalledWith(
+                expect.objectContaining({
+                    success: true,
+                    data: expect.objectContaining({
+                        settings: mockSettings
+                    })
+                })
+            );
+            expect(mockNext).not.toHaveBeenCalled();
+        });
+    });
+
+    describe('updateSettings', () => {
+        it('should call next with error when userService throws', async () => {
+            const testError = new Error('Settings update failed');
+            mockUpdateUserSettings.mockRejectedValue(testError);
+            mockReq.body = { preferredLanguage: 'GREEK' };
+
+            await userController.updateSettings(mockReq, mockRes, mockNext);
+
+            expect(mockNext).toHaveBeenCalledWith(testError);
+            expect(mockRes.json).not.toHaveBeenCalled();
+        });
+
+        it('should return updated settings on success', async () => {
+            const mockUpdatedSettings = { userId: 1, preferredLanguage: 'GREEK' };
+            mockUpdateUserSettings.mockResolvedValue(mockUpdatedSettings);
+            mockReq.body = { preferredLanguage: 'GREEK' };
+
+            await userController.updateSettings(mockReq, mockRes, mockNext);
+
+            expect(mockRes.json).toHaveBeenCalledWith(
+                expect.objectContaining({
+                    success: true,
+                    message: 'User settings updated successfully'
+                })
+            );
+            expect(mockNext).not.toHaveBeenCalled();
+        });
+    });
+});
diff --git a/tests/unit/userService.test.js b/tests/unit/userService.test.js
index 5f2882a..e3e7ae1 100644
--- a/tests/unit/userService.test.js
+++ b/tests/unit/userService.test.js
@@ -76,8 +76,8 @@ describe('User Service', () => {
     });
 
     it('should update multiple fields at once', async () => {
-      const updates = { 
-        name: 'New Name', 
+      const updates = {
+        name: 'New Name',
         email: 'another@example.com',
         phone: '1234567890'
       };
@@ -107,7 +107,7 @@ describe('User Service', () => {
 
     it('should throw ConflictError when email is already in use', async () => {
       // Create another user
-      const anotherUser = await db.createUser({
+      await db.createUser({
         name: 'Another User',
         email: 'another@example.com',
         password: 'password123'
@@ -120,7 +120,7 @@ describe('User Service', () => {
     });
 
     it('should not update disallowed fields like password or role', async () => {
-      const updates = { 
+      const updates = {
         name: 'Valid Update',
         password: 'hacked',
         role: 'admin'
@@ -173,7 +173,7 @@ describe('User Service', () => {
     });
 
     it('should update notification preferences', async () => {
-      const updates = { 
+      const updates = {
         emailNotifications: true,
         pushNotifications: false
       };
@@ -194,6 +194,61 @@ describe('User Service', () => {
         .rejects
         .toThrow(NotFoundError);
     });
+
+    it('should update accessibility settings', async () => {
+      const updates = {
+        accessibilitySettings: ['HIGH_CONTRAST', 'LARGE_TEXT']
+      };
+      const updated = await userService.updateUserSettings(testUser.userId, updates);
+
+      expect(updated.accessibilitySettings).toEqual(['HIGH_CONTRAST', 'LARGE_TEXT']);
+    });
+
+    it('should update privacy settings', async () => {
+      const updates = {
+        privacySettings: ['HIDE_EMAIL', 'HIDE_LOCATION']
+      };
+      const updated = await userService.updateUserSettings(testUser.userId, updates);
+
+      expect(updated.privacySettings).toEqual(['HIDE_EMAIL', 'HIDE_LOCATION']);
+    });
+
+    it('should update user agreement accepted flag', async () => {
+      const updates = {
+        userAgreementAccepted: true
+      };
+      const updated = await userService.updateUserSettings(testUser.userId, updates);
+
+      expect(updated.userAgreementAccepted).toBe(true);
+    });
+
+    it('should update language setting', async () => {
+      const updates = {
+        language: 'el'
+      };
+      const updated = await userService.updateUserSettings(testUser.userId, updates);
+
+      expect(updated.language).toBe('el');
+    });
+
+    it('should update multiple settings at once', async () => {
+      const updates = {
+        preferredLanguage: 'GREEK',
+        emailNotifications: true,
+        pushNotifications: false,
+        accessibilitySettings: ['HIGH_CONTRAST'],
+        privacySettings: ['HIDE_LOCATION'],
+        userAgreementAccepted: true
+      };
+      const updated = await userService.updateUserSettings(testUser.userId, updates);
+
+      expect(updated.preferredLanguage).toBe('GREEK');
+      expect(updated.emailNotifications).toBe(true);
+      expect(updated.pushNotifications).toBe(false);
+      expect(updated.accessibilitySettings).toEqual(['HIGH_CONTRAST']);
+      expect(updated.privacySettings).toEqual(['HIDE_LOCATION']);
+      expect(updated.userAgreementAccepted).toBe(true);
+    });
   });
 
   describe('deleteUser', () => {
@@ -233,7 +288,7 @@ describe('User Service', () => {
 
       expect(Array.isArray(users)).toBe(true);
       expect(users.length).toBeGreaterThan(0);
-      
+
       // Check that passwords are sanitized
       users.forEach(user => {
         expect(user).not.toHaveProperty('password');
diff --git a/tests/unit/validationMiddleware.test.js b/tests/unit/validationMiddleware.test.js
index 1d67a3a..8361514 100644
--- a/tests/unit/validationMiddleware.test.js
+++ b/tests/unit/validationMiddleware.test.js
@@ -28,15 +28,15 @@ describe('Validation Middleware', () => {
     });
 
     it('should return 400 validation error when validation fails', () => {
-      const req = {};
+      // Note: req object not needed in this test - validation logic doesn't use it
       const res = {
         statusCode: 200,
         jsonData: null,
-        status: function(code) {
+        status: function (code) {
           this.statusCode = code;
           return this;
         },
-        json: function(data) {
+        json: function (data) {
           this.jsonData = data;
           return this;
         }
@@ -112,11 +112,11 @@ describe('Validation Middleware', () => {
       const res = {
         statusCode: 200,
         jsonData: null,
-        status: function(code) {
+        status: function (code) {
           this.statusCode = code;
           return this;
         },
-        json: function(data) {
+        json: function (data) {
           this.jsonData = data;
           return this;
         }