Add comprehensive test suite infrastructure

- Create backend xUnit test project with Moq and FluentAssertions
- Add test utilities: TestDataFactory, MockHttpContext, TestUserClaims
- Create AuthControllerTests with comprehensive auth scenarios
- Install Jest and React Testing Library for frontend
- Configure jest.config.ts and jest.setup.ts with Next.js support
- Add test scripts to package.json

frontend/jest.config.ts

@@ -0,0 +1,37 @@
+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',
+  setupFilesAfterEnv: ['<rootDir>/jest.setup.ts'],
+  moduleNameMapper: {
+    '^@/(.*)$': '<rootDir>/src/$1',
+  },
+  testPathIgnorePatterns: [
+    '<rootDir>/node_modules/',
+    '<rootDir>/.next/',
+  ],
+  collectCoverageFrom: [
+    'src/**/*.{js,jsx,ts,tsx}',
+    '!src/**/*.d.ts',
+    '!src/**/*.stories.{js,jsx,ts,tsx}',
+  ],
+  coverageThreshold: {
+    global: {
+      branches: 0,
+      functions: 0,
+      lines: 0,
+      statements: 0,
+    },
+  },
+};
+
+// createJestConfig is exported this way to ensure that next/jest can load the Next.js config which is async
+export default createJestConfig(config);

frontend/jest.setup.ts

@@ -0,0 +1,62 @@
+import '@testing-library/jest-dom';
+
+// Mock Next.js router
+jest.mock('next/navigation', () => ({
+  useRouter() {
+    return {
+      route: '/',
+      pathname: '/',
+      query: {},
+      asPath: '/',
+      push: jest.fn(),
+      replace: jest.fn(),
+      reload: jest.fn(),
+      back: jest.fn(),
+      prefetch: jest.fn(),
+      beforePopState: jest.fn(),
+      events: {
+        on: jest.fn(),
+        off: jest.fn(),
+        emit: jest.fn(),
+      },
+      isFallback: false,
+      isLocaleDomain: false,
+      isReady: true,
+      isPreview: false,
+    };
+  },
+  useSearchParams() {
+    return {
+      get: jest.fn(),
+      getAll: jest.fn(),
+      has: jest.fn(),
+      entries: jest.fn(),
+      keys: jest.fn(),
+      values: jest.fn(),
+      forEach: jest.fn(),
+    };
+  },
+  usePathname() {
+    return '/';
+  },
+}));
+
+// Mock window.matchMedia
+Object.defineProperty(window, 'matchMedia', {
+  writable: true,
+  value: jest.fn().mockImplementation(query => ({
+    matches: false,
+    media: query,
+    onchange: null,
+    addListener: jest.fn(),
+    removeListener: jest.fn(),
+    addEventListener: jest.fn(),
+    removeEventListener: jest.fn(),
+    dispatchEvent: jest.fn(),
+  })),
+});
+
+// Clean up after each test
+afterEach(() => {
+  jest.clearAllMocks();
+});

frontend/package.json

@@ -6,7 +6,10 @@
     "dev": "next dev",
     "build": "next build",
     "start": "next start",
-    "lint": "eslint"
+    "lint": "eslint",
+    "test": "jest",
+    "test:watch": "jest --watch",
+    "test:coverage": "jest --coverage"
   },
   "dependencies": {
     "next": "16.2.2",
@@ -15,12 +18,19 @@
   },
   "devDependencies": {
     "@tailwindcss/postcss": "^4",
+    "@testing-library/dom": "^10.4.1",
+    "@testing-library/jest-dom": "^6.9.1",
+    "@testing-library/react": "^16.3.2",
+    "@testing-library/user-event": "^14.6.1",
+    "@types/jest": "^30.0.0",
     "@types/node": "^20",
     "@types/react": "^19",
     "@types/react-dom": "^19",
     "eslint": "^9",
     "eslint-config-next": "16.2.2",
+    "jest": "^30.3.0",
     "tailwindcss": "^4",
+    "ts-jest": "^29.4.9",
     "typescript": "^5"
   },
   "ignoreScripts": [