Write unit tests for user registration and login

Fixes DEVRhylme-Foundation#4

Add unit tests for user registration and login functionalities.

* **Tests**: Add `tests/auth.test.js` to test `POST /auth/register` and `POST /auth/login` endpoints using Jest.
* **Dependencies**: Add `jest` and `supertest` as dev dependencies in `package.json`. Add a test script to run Jest.
* **Configuration**: Add `jest.config.js` to configure Jest for the Node.js environment.
* **CI**: Modify `.github/workflows/build.yaml` to include steps for setting up Node.js, installing dependencies, and running Jest tests.

.github/workflows/build.yaml

@@ -26,3 +26,14 @@ jobs:
 
     - name: Test
       run: go test -v ./...
+
+    - name: Set up Node.js
+      uses: actions/setup-node@v2
+      with:
+        node-version: '14'
+
+    - name: Install dependencies
+      run: npm install
+
+    - name: Run Jest tests
+      run: npm test

jest.config.js

@@ -0,0 +1,7 @@
+module.exports = {
+  testEnvironment: 'node',
+  verbose: true,
+  collectCoverage: true,
+  coverageDirectory: 'coverage',
+  testMatch: ['**/tests/**/*.test.js']
+};

package.json

@@ -0,0 +1,18 @@
+{
+  "name": "expressify",
+  "version": "1.0.0",
+  "description": "A CLI tool to generate a production-grade scaffold for Express applications.",
+  "main": "index.js",
+  "scripts": {
+    "test": "jest"
+  },
+  "dependencies": {
+    "express": "^4.17.1"
+  },
+  "devDependencies": {
+    "jest": "^27.0.6",
+    "supertest": "^6.1.3"
+  },
+  "author": "DEVRhylme-Foundation",
+  "license": "MIT"
+}

tests/auth.test.js

@@ -0,0 +1,63 @@
+const request = require('supertest');
+const app = require('../src/app'); // Adjust the path as necessary
+
+describe('User Registration and Login', () => {
+  describe('POST /auth/register', () => {
+    it('should register a user with valid data', async () => {
+      const response = await request(app)
+        .post('/auth/register')
+        .send({
+          username: 'testuser',
+          password: 'password123',
+          email: '[email protected]'
+        });
+      expect(response.status).toBe(201);
+      expect(response.body).toHaveProperty('id');
+      expect(response.body).toHaveProperty('username', 'testuser');
+    });
+
+    it('should reject registration with invalid data', async () => {
+      const response = await request(app)
+        .post('/auth/register')
+        .send({
+          username: '',
+          password: 'short',
+          email: 'invalidemail'
+        });
+      expect(response.status).toBe(400);
+    });
+  });
+
+  describe('POST /auth/login', () => {
+    it('should return a token for valid credentials', async () => {
+      // First, register a user
+      await request(app)
+        .post('/auth/register')
+        .send({
+          username: 'testuser',
+          password: 'password123',
+          email: '[email protected]'
+        });
+
+      // Then, login with the same user
+      const response = await request(app)
+        .post('/auth/login')
+        .send({
+          username: 'testuser',
+          password: 'password123'
+        });
+      expect(response.status).toBe(200);
+      expect(response.body).toHaveProperty('token');
+    });
+
+    it('should reject login with invalid credentials', async () => {
+      const response = await request(app)
+        .post('/auth/login')
+        .send({
+          username: 'nonexistentuser',
+          password: 'wrongpassword'
+        });
+      expect(response.status).toBe(401);
+    });
+  });
+});