fix(testAdded)

jest.config.ts

@@ -0,0 +1,18 @@
+import type { Config } from 'jest';
+import nextJest from 'next/jest.js';
+
+const createJestConfig = nextJest({
+  // Provide the path to your Next.js app to load next.config.js and .env files in your test environment
+  dir: './',
+});
+
+// Add any custom config to be passed to Jest
+const config: Config = {
+  coverageProvider: 'v8',
+  testEnvironment: 'jsdom',
+  // Add more setup options before each test is run
+  // setupFilesAfterEnv: ['<rootDir>/jest.setup.ts'],
+};
+
+// createJestConfig is exported this way to ensure that next/jest can load the Next.js config which is async
+export default createJestConfig(config);

package.json

@@ -6,7 +6,9 @@
     "dev": "next dev",
     "build": "next build",
     "start": "next start",
-    "lint": "next lint"
+    "lint": "next lint",
+    "test": "jest",
+    "test:watch": "jest --watch"
   },
   "dependencies": {
     "@emotion/cache": "^11.13.1",
@@ -27,12 +29,14 @@
     "react-redux": "^9.1.2",
     "redux-persist": "^6.0.0",
     "sass": "^1.77.8",
+    "ts-node": "^10.9.2",
     "zod": "^3.23.8"
   },
   "devDependencies": {
     "@testing-library/jest-dom": "^6.4.8",
     "@testing-library/react": "^16.0.0",
     "@testing-library/user-event": "^14.5.2",
+    "@types/jest": "^29.5.12",
     "@types/node": "^20",
     "@types/react": "^18",
     "@types/react-dom": "^18",
@@ -40,6 +44,8 @@
     "eslint": "^8",
     "eslint-config-next": "14.2.5",
     "jest": "^29.7.0",
+    "jest-environment-jsdom": "^29.7.0",
+    "ts-jest": "^29.2.4",
     "typescript": "^5"
   }
 }

src/app/(dashboard)/products/page.tsx

@@ -4,7 +4,7 @@ import React from "react";
 import CardHeader from "@mui/material/CardHeader";
 import CardContent from "@mui/material/CardContent";
 import TitleHeader from "@/components/titleHeader/titleHeader";
-import homeServices from "@/services/home.services";
+import homeServices from "@/services/api/productsApi";
 
 const HomePage = async () => {
   const data = await homeServices.getProducts();

src/services/api/__mocks__/axiosInstance.ts

@@ -0,0 +1,7 @@
+// __mocks__/axiosInstance.ts
+import axios from 'axios';
+import MockAdapter from 'axios-mock-adapter';
+
+const mock = new MockAdapter(axios);
+
+export default mock;

src/services/api/loginApi.test.ts

@@ -0,0 +1,33 @@
+import axiosInstance from '../axios/axiosInstance';
+import { loginApi } from './loginApi';
+
+jest.mock('../axios/axiosInstance');
+
+describe('login API', () => {
+  it('should return token on successful login', async () => {
+    const mockResponse = {
+      data: {
+        token: 'fake-token',
+      },
+    };
+    (axiosInstance.post as jest.Mock).mockResolvedValue(mockResponse);
+
+    const data = { username: 'emilys', password: 'emilyspass' };
+    const result = await loginApi(data);
+
+    expect(result).toEqual(mockResponse.data);
+    expect(axiosInstance.post).toHaveBeenCalledWith('/auth/login', data);
+  });
+
+  it('should throw an error on failed login', async () => {
+    const errorMessage = 'Invalid credentials';
+    (axiosInstance.post as jest.Mock).mockRejectedValue(
+      new Error(errorMessage)
+    );
+
+    const data = { username: 'test@example.com', password: 'wrongpassword' };
+
+    await expect(loginApi(data)).rejects.toThrow(errorMessage);
+    expect(axiosInstance.post).toHaveBeenCalledWith('/auth/login', data);
+  });
+});

src/services/api/productApi.test.ts

@@ -0,0 +1,29 @@
+import axios from 'axios';
+import homeServices from './productsApi';
+
+jest.mock('axios');
+
+describe('homeServices.getProducts', () => {
+  afterEach(() => {
+    jest.clearAllMocks();
+  });
+
+  test('should return data on successful API call', async () => {
+    const mockData = { products: [{ id: 1, name: 'Product 1' }] };
+    (axios.get as jest.Mock).mockResolvedValue({ data: mockData });
+
+    const result = await homeServices.getProducts();
+
+    expect(result).toEqual(mockData);
+    expect(axios.get).toHaveBeenCalledWith('https://dummyjson.com/products');
+  });
+
+  test('should throw generic error message on non-Axios error', async () => {
+    (axios.get as jest.Mock).mockRejectedValue(new Error('Non-Axios error'));
+
+    await expect(homeServices.getProducts()).rejects.toThrow(
+      'Something went wrong. Please try again.'
+    );
+    expect(axios.get).toHaveBeenCalledWith('https://dummyjson.com/products');
+  });
+});

src/services/api/productsApi.ts

@@ -1,16 +1,16 @@
-import axios, { isAxiosError } from "axios";
+import axios, { isAxiosError } from 'axios';
 
 /** Product List Home Page */
 const homeServices = {
   getProducts: async () => {
     try {
-      const res = await axios.get("https://dummyjson.com/products");
+      const res = await axios.get('https://dummyjson.com/products');
       return res.data;
     } catch (error: any) {
       if (isAxiosError(error)) {
         throw new Error(error.response?.data.message);
       }
-      throw new Error("Something went wrong. Please try again.");
+      throw new Error('Something went wrong. Please try again.');
     }
   },
 };