Set up Jest testing environment and refactor test configurations

Author: whiteSHADOW1234

.github/workflows/ci-cd.yml

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+# .github/workflows/ci.yml
+name: CI/CD
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    env:
+      REACT_APP_AUTH_URL=${{ secrets.REACT_APP_AUTH_URL }}
+      REACT_APP_COURSE_URL=${{ secrets.REACT_APP_COURSE_URL }}
+      PORT=${{ secrets.PORT }}
+      MONGODB_URI=${{ secrets.MONGODB_URI }}
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v3
+        with:
+          node-version: 16  # Or your desired Node.js version
+
+      - name: Install server dependencies
+        run: cd server && npm install && cd ..
+
+      - name: Install client dependencies
+        run: cd client && npm install && cd ..
+
+      - name: Run server tests
+        run: npm test --prefix server
+
+      - name: Run client tests
+        run: npm test --prefix client
+
+      - name: Build Docker images
+        run: docker compose build

client/jest.config.js

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+/** @type {import('ts-jest').JestConfigWithTsJest} **/
+module.exports = {
+  preset: 'ts-jest',
+  testEnvironment: "jsdom",
+  testMatch: ['**/__tests__/**/*.[jt]s?(x)', '**/?(*.)+(spec|test).[tj]s?(x)'],
+  moduleDirectories: ['node_modules', 'src'],
+  moduleFileExtensions: ['ts', 'tsx', 'js', 'jsx', 'json', 'node'],
+  setupFilesAfterEnv: ['<rootDir>/jest.setup.ts'],
+  transform: {
+    "^.+.tsx?$": ["ts-jest",{}],
+  },
+};

client/jest.setup.ts

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+import '@testing-library/jest-dom';