diff --git a/src/components/atoms/action-dropdown/ActionDropdown.test.tsx b/src/components/atoms/action-dropdown/ActionDropdown.test.tsx
new file mode 100644
index 00000000..1ff4f2c6
--- /dev/null
+++ b/src/components/atoms/action-dropdown/ActionDropdown.test.tsx
@@ -0,0 +1,71 @@
+import "@testing-library/jest-dom";
+
+import { fireEvent, render, screen } from "@testing-library/react";
+
+import ActionDropdown from "./ActionDropdown";
+
+describe("ActionDropdown Component", () => {
+  let mockItems: { label: string; onClick: jest.Mock }[];
+
+  beforeEach(() => {
+    mockItems = [
+      { label: "Option 1", onClick: jest.fn() },
+      { label: "Option 2", onClick: jest.fn() },
+    ];
+  });
+
+  test("드롭다운이 열려 있을 때 메뉴가 렌더링 되는지 확인", () => {
+    render(
+      <ActionDropdown items={mockItems} isOpen={true} setIsOpen={jest.fn()} />,
+    );
+
+    expect(screen.getByText("Option 1")).toBeInTheDocument();
+    expect(screen.getByText("Option 2")).toBeInTheDocument();
+  });
+
+  test("드롭다운이 닫혀 있을 때 메뉴가 보이지 않는지 확인", () => {
+    render(
+      <ActionDropdown items={mockItems} isOpen={false} setIsOpen={jest.fn()} />,
+    );
+
+    expect(screen.queryByText("Option 1")).not.toBeInTheDocument();
+    expect(screen.queryByText("Option 2")).not.toBeInTheDocument();
+  });
+
+  test("메뉴 아이템을 클릭하면 onClick 핸들러가 호출되고 드롭다운이 닫힘", () => {
+    const setIsOpenMock = jest.fn(); // 드롭다운 상태를 변경하는 Mock 함수 생성
+
+    render(
+      <ActionDropdown
+        items={mockItems}
+        isOpen={true}
+        setIsOpen={setIsOpenMock} // 드롭다운 상태를 변경할 Mock 함수를 props로 전달
+      />,
+    );
+
+    const option1 = screen.getByText("Option 1");
+    fireEvent.click(option1);
+
+    // Option 1의 onClick 핸들러가 정상적으로 실행되었는지 확인
+    expect(mockItems[0].onClick).toHaveBeenCalledTimes(1);
+
+    // 클릭 후 드롭다운이 닫혔는지 확인
+    expect(setIsOpenMock).toHaveBeenCalledWith(false);
+  });
+
+  test("드롭다운 외부 클릭 시 닫힘", () => {
+    const setIsOpenMock = jest.fn();
+    render(
+      <ActionDropdown
+        items={mockItems}
+        isOpen={true}
+        setIsOpen={setIsOpenMock}
+      />,
+    );
+
+    const overlay = screen.getByTestId("dropdown-overlay");
+    fireEvent.click(overlay);
+
+    expect(setIsOpenMock).toHaveBeenCalledWith(false);
+  });
+});
diff --git a/src/components/atoms/action-dropdown/ActionDropdown.tsx b/src/components/atoms/action-dropdown/ActionDropdown.tsx
index 6d0d3fa7..4f8ffcdf 100644
--- a/src/components/atoms/action-dropdown/ActionDropdown.tsx
+++ b/src/components/atoms/action-dropdown/ActionDropdown.tsx
@@ -88,6 +88,7 @@ export default function ActionDropdown({
 
           {/* dropdown 외부를 덮고있는 레이어 (드롭다운 외부 클릭 시 닫혀야 함) */}
           <div
+            data-testid="dropdown-overlay"
             className="fixed inset-0 z-1 bg-transparent"
             onClick={closeDropdown}
           />
diff --git a/src/components/atoms/button/Button.test.tsx b/src/components/atoms/button/Button.test.tsx
new file mode 100644
index 00000000..dabcc74b
--- /dev/null
+++ b/src/components/atoms/button/Button.test.tsx
@@ -0,0 +1,64 @@
+import "@testing-library/jest-dom";
+
+import { fireEvent, render, screen } from "@testing-library/react";
+
+import Button from "./Button";
+
+describe("Button Component", () => {
+  test("버튼이 기본 스타일로 렌더링 되는지 확인", () => {
+    render(<Button>버튼</Button>);
+
+    const button = screen.getByRole("button", { name: "버튼" });
+
+    expect(button).toBeInTheDocument();
+    expect(button).toHaveClass("bg-blue-500 text-white");
+  });
+
+  test("variant props에 따라 스타일이 변경되는지 확인", () => {
+    render(<Button variant="outline">버튼</Button>);
+
+    const button = screen.getByRole("button", { name: "버튼" });
+
+    expect(button).toHaveClass("bg-white text-blue-500 border");
+  });
+
+  test("size props에 따라 크기가 변경되는지 확인", () => {
+    render(<Button size="lg">버튼</Button>);
+
+    const button = screen.getByRole("button", { name: "버튼" });
+
+    expect(button).toHaveClass("w-[291px] h-[48px] text-base");
+  });
+
+  test("rounded props가 true일 때, 둥근 스타일이 적용되는지 확인", () => {
+    render(<Button rounded={true}>버튼</Button>);
+
+    const button = screen.getByRole("button", { name: "버튼" });
+
+    expect(button).toHaveClass("rounded-[24px]");
+  });
+
+  test("disabled 상태일 때 클릭 이벤트가 발생하지 않는지 확인", () => {
+    const handleClick = jest.fn();
+    render(
+      <Button onClick={handleClick} disabled>
+        버튼
+      </Button>,
+    );
+
+    const button = screen.getByRole("button", { name: "버튼" });
+    fireEvent.click(button);
+
+    expect(handleClick).not.toHaveBeenCalled();
+  });
+
+  test("버튼 클릭 시 onClick 핸들러가 호출되는지 확인", () => {
+    const handleClick = jest.fn();
+    render(<Button onClick={handleClick}>버튼</Button>);
+
+    const button = screen.getByRole("button", { name: "버튼" });
+    fireEvent.click(button);
+
+    expect(handleClick).toHaveBeenCalledTimes(1);
+  });
+});
diff --git a/src/components/atoms/exit-btn/ExitBtn.test.tsx b/src/components/atoms/exit-btn/ExitBtn.test.tsx
new file mode 100644
index 00000000..52a8bd15
--- /dev/null
+++ b/src/components/atoms/exit-btn/ExitBtn.test.tsx
@@ -0,0 +1,33 @@
+import "@testing-library/jest-dom";
+
+import { fireEvent, render, screen } from "@testing-library/react";
+
+import ExitBtn from "./ExitBtn";
+
+describe("ExitBtn Component", () => {
+  test("이미지가 올바르게 렌더링되는지 확인", () => {
+    render(<ExitBtn onClick={jest.fn()} />);
+
+    const button = screen.getByRole("img", { name: /exit-button/i });
+
+    expect(button).toBeInTheDocument();
+  });
+
+  test("props로 넘겨준 클래스가 정상적으로 적용되는지 확인", () => {
+    render(<ExitBtn onClick={jest.fn()} className="custom-class" />);
+
+    const button = screen.getByRole("img", { name: /exit-button/i });
+
+    expect(button).toHaveClass("custom-class");
+  });
+
+  test("클릭 시 onClick 핸들러가 호출되는지 확인", () => {
+    const handleClick = jest.fn();
+    render(<ExitBtn onClick={handleClick} />);
+
+    const button = screen.getByRole("img", { name: /exit-button/i });
+    fireEvent.click(button);
+
+    expect(handleClick).toHaveBeenCalledTimes(1);
+  });
+});
diff --git a/src/components/atoms/exit-btn/ExitBtn.tsx b/src/components/atoms/exit-btn/ExitBtn.tsx
index e9d78a19..05005ee7 100644
--- a/src/components/atoms/exit-btn/ExitBtn.tsx
+++ b/src/components/atoms/exit-btn/ExitBtn.tsx
@@ -13,7 +13,6 @@ export default function ExitBtn({ onClick, className }: ExitBtnProps) {
       alt="exit-button"
       width={24}
       height={24}
-      layout="fixed"
       className={cn("cursor-pointer hover:brightness-50", className)}
       onClick={onClick}
     />
diff --git a/src/components/atoms/goal-item/GoalItem.test.tsx b/src/components/atoms/goal-item/GoalItem.test.tsx
new file mode 100644
index 00000000..73bdf3da
--- /dev/null
+++ b/src/components/atoms/goal-item/GoalItem.test.tsx
@@ -0,0 +1,63 @@
+import "@testing-library/jest-dom";
+
+import { render, screen } from "@testing-library/react";
+
+import GoalItem from "./GoalItem";
+
+describe("GoalItem Component", () => {
+  test("아이콘과 텍스트가 정상적으로 렌더링 되는지 확인", () => {
+    render(
+      <GoalItem
+        goal="목표제목"
+        iconSize="sm"
+        textSize="base"
+        fontWeight="medium"
+      />,
+    );
+
+    const icon = screen.getByRole("img", { name: "flag-goal" });
+    const text = screen.getByText("목표제목");
+
+    expect(icon).toBeInTheDocument();
+    expect(text).toBeInTheDocument();
+  });
+
+  test("아이콘 크기가 lg일 때 size가 올바르게 렌더링 되는지 확인", () => {
+    render(
+      <GoalItem
+        goal="Big Goal"
+        iconSize="lg"
+        textSize="lg"
+        fontWeight="semibold"
+      />,
+    );
+
+    const icon = screen.getByRole("img", { name: "flag-goal" });
+
+    expect(icon).toHaveAttribute("width", "40");
+    expect(icon).toHaveAttribute("height", "40");
+  });
+
+  test("goal 값이 없을 때, span 태그가 렌더링되지 않는지 확인", () => {
+    render(<GoalItem iconSize="sm" textSize="base" fontWeight="medium" />);
+
+    const text = screen.queryByText(/.+/); // 아무 텍스트나 있는지 확인
+
+    expect(text).not.toBeInTheDocument();
+  });
+
+  test("gap 값이 올바르게 적용되는지 확인", () => {
+    const { container } = render(
+      <GoalItem
+        goal="Gap Test"
+        iconSize="sm"
+        textSize="sm"
+        fontWeight="medium"
+        gap={10}
+      />,
+    );
+
+    const wrapper = container.firstChild;
+    expect(wrapper).toHaveStyle("gap: 10px");
+  });
+});
diff --git a/src/components/atoms/goal-item/GoalItem.tsx b/src/components/atoms/goal-item/GoalItem.tsx
index fc0a8881..07367786 100644
--- a/src/components/atoms/goal-item/GoalItem.tsx
+++ b/src/components/atoms/goal-item/GoalItem.tsx
@@ -33,7 +33,6 @@ export default function GoalItem({
     width: iconSize === "lg" ? 40 : 24,
     height: iconSize === "lg" ? 40 : 24,
     alt: "flag-goal",
-    layout: "fixed",
   };
 
   return (
diff --git a/src/components/atoms/input/Input.test.tsx b/src/components/atoms/input/Input.test.tsx
new file mode 100644
index 00000000..a18710bb
--- /dev/null
+++ b/src/components/atoms/input/Input.test.tsx
@@ -0,0 +1,46 @@
+import "@testing-library/jest-dom";
+
+import { fireEvent, render, screen } from "@testing-library/react";
+
+import RefInput from "./Input";
+
+describe("RefInput Component", () => {
+  test("기본 렌더링 확인", () => {
+    render(<RefInput placeholder="Enter text" />);
+
+    const input = screen.getByPlaceholderText("Enter text");
+
+    expect(input).toBeInTheDocument();
+  });
+
+  test("size props에 따라 클래스가 적용되는지 확인", () => {
+    render(<RefInput size="lg" placeholder="Large input" />);
+    const input = screen.getByPlaceholderText("Large input");
+
+    expect(input).toHaveClass("w-[612px] h-[48px] text-base");
+  });
+
+  test("사용자 정의 className이 올바르게 적용되는지 확인", () => {
+    render(<RefInput className="custom-class" placeholder="text" />);
+    const input = screen.getByPlaceholderText("text");
+
+    expect(input).toHaveClass("custom-class");
+  });
+
+  test("placeholder가 올바르게 표시되는지 확인", () => {
+    render(<RefInput placeholder="Test Placeholder" />);
+    const input = screen.getByPlaceholderText("Test Placeholder");
+
+    expect(input).toBeInTheDocument();
+  });
+
+  test("입력값이 정상적으로 반영되는지 확인", () => {
+    render(<RefInput />);
+    const input = screen.getByRole("textbox");
+
+    // 값 입력
+    fireEvent.change(input, { target: { value: "Hello, World!" } });
+
+    expect(input).toHaveValue("Hello, World!");
+  });
+});
diff --git a/src/components/atoms/input/Input.tsx b/src/components/atoms/input/Input.tsx
index 986a293b..1a9f5c39 100644
--- a/src/components/atoms/input/Input.tsx
+++ b/src/components/atoms/input/Input.tsx
@@ -32,18 +32,15 @@ type InputElementProps = Omit<
 
 const RefInput = forwardRef<HTMLInputElement, InputElementProps>(
   ({ className, size, ...props }, ref) => {
-    const sizeProps = typeof size === "number" ? { size } : {};
-
     return (
       <input
         ref={ref}
         className={cn(
           inputVariants({
-            size: typeof size !== "number" ? size : undefined,
+            size,
             className,
           }),
         )}
-        {...sizeProps}
         {...props}
       />
     );
diff --git a/src/components/atoms/spinner/Spinner.tsx b/src/components/atoms/spinner/Spinner.tsx
index f842b793..17c878bd 100644
--- a/src/components/atoms/spinner/Spinner.tsx
+++ b/src/components/atoms/spinner/Spinner.tsx
@@ -12,7 +12,6 @@ export default function Spinner({ size }: SpinnerProps) {
         alt="spinner"
         width={size}
         height={size}
-        layout="fixed"
       />
     </div>
   );
diff --git a/src/components/atoms/title-with-icon/TitleWithIcon.tsx.tsx b/src/components/atoms/title-with-icon/TitleWithIcon.tsx.tsx
index 0375f9f6..a2dbf7ff 100644
--- a/src/components/atoms/title-with-icon/TitleWithIcon.tsx.tsx
+++ b/src/components/atoms/title-with-icon/TitleWithIcon.tsx.tsx
@@ -22,7 +22,6 @@ export default function TitleWithIcon({
     width: iconSize === "lg" ? 40 : 24,
     height: iconSize === "lg" ? 40 : 24,
     alt: `${imgUrl}`,
-    layout: "fixed",
   };
 
   return (
diff --git a/src/utils/formatDate/formatDate.test.ts b/src/utils/formatDate/formatDate.test.ts
index d626f68a..c4fde667 100644
--- a/src/utils/formatDate/formatDate.test.ts
+++ b/src/utils/formatDate/formatDate.test.ts
@@ -35,6 +35,19 @@ describe("formatDate 함수 테스트", () => {
     );
   });
 
+  test("빈 값 입력 시 빈 문자열 반환", () => {
+    expect(formatDate(undefined)).toBe("");
+  });
+
+  test("지원되지 않는 타입 입력 시 예외 발생", () => {
+    const invalidInputs = [{}, [], true];
+    invalidInputs.forEach((input) => {
+      expect(() => formatDate(input as never)).toThrow(
+        "유효하지 않은 날짜 형식입니다.",
+      );
+    });
+  });
+
   test("숫자 범위를 초과하는 타임스탬프를 입력하면 예외를 발생", () => {
     expect(() => formatDate(9999999999999999)).toThrow(
       "유효하지 않은 날짜 형식입니다.",
diff --git a/src/views/dashboard/goal-based-todo/components/GoalItem.tsx b/src/views/dashboard/goal-based-todo/components/GoalItem.tsx
index 844631bd..92b05a87 100644
--- a/src/views/dashboard/goal-based-todo/components/GoalItem.tsx
+++ b/src/views/dashboard/goal-based-todo/components/GoalItem.tsx
@@ -64,7 +64,6 @@ export default function GoalItem({ goal }: GoalItemProps) {
           alt={"arrow_right"}
           width={20}
           height={20}
-          layout="fixed"
         />
       </button>
     </li>
diff --git a/src/views/note/note-detail/components/LinkItem.tsx b/src/views/note/note-detail/components/LinkItem.tsx
index e1defb56..41c79199 100644
--- a/src/views/note/note-detail/components/LinkItem.tsx
+++ b/src/views/note/note-detail/components/LinkItem.tsx
@@ -17,13 +17,7 @@ export default function LinkItem({ linkUrl, setIsEmbedOpen }: LinkItemProps) {
       onClick={toggleEmbed}
       className="flex cursor-pointer items-center gap-2 rounded-[20px] bg-slate-200 px-[6px] py-1 hover:brightness-95"
     >
-      <Image
-        src={"/icons/embed.png"}
-        alt="embed-icon"
-        width={24}
-        height={24}
-        layout="fixed"
-      />
+      <Image src={"/icons/embed.png"} alt="embed-icon" width={24} height={24} />
       <span className="text-base font-normal break-all text-slate-800">
         {linkUrl}
       </span>