diff --git a/.circleci/config.yml b/.circleci/config.yml
new file mode 100644
index 00000000..dff3c0b9
--- /dev/null
+++ b/.circleci/config.yml
@@ -0,0 +1,26 @@
+version: '2.1'
+orbs:
+  python: circleci/python@1.1.0
+jobs:
+  build:
+    executor: python/default
+    steps:
+      - checkout
+      - python/install-packages:
+          pkg-manager: pip
+      - python/install-packages:
+          pip-dependency-file: requirements.txt
+          pkg-manager: pip
+      - python/install-packages:
+          args: pytest
+          pkg-manager: pip
+          pypi-cache: false
+      - run:
+          command: |
+            pytest --version
+          name: Test
+workflows:
+  main:
+    jobs:
+      - build
+
diff --git a/data/jokes.json b/data/jokes.json
index f1e5c6fe..c2d9ce47 100644
--- a/data/jokes.json
+++ b/data/jokes.json
@@ -44,6 +44,7 @@
     "What did the hot-dog say when he needed to use the bathroom?\nMust-Turd",
     "What kind of bagel can fly?\nA Plain Bagel.",
     "Where do animals go when their tails fall off?\nA retail store ;)",
-    "What was Forrest Gump's password?\n1Forrest1."
+    "What was Forrest Gump's password?\n1Forrest1.",
+    "Did you hear about the mathematician who's afraid of negative numbers?\nHe'll stop at nothing to avoid them."
   ]
 }