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backend/tests/integration.test.js

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+const request = require('supertest');
+const app = require('../server');
+const { sequelize } = require('../models');
+
+describe('Integration Tests - Complete User Flow', () => {
+  let server;
+  const testUser = {
+    username: 'integrationtest',
+    email: 'integration@test.com',
+    password: 'Test123!@#'
+  };
+  let userToken = null;
+  let adminToken = null;
+
+  beforeAll(async () => {
+    // Start server
+    server = app.listen(0);
+    
+    // Login as admin for setup
+    const adminRes = await request(app)
+      .post('/api/auth/login')
+      .send({
+        email: 'admin@example.com',
+        password: 'Admin123!@#'
+      });
+    
+    if (adminRes.status === 200) {
+      adminToken = adminRes.body.data.token;
+    }
+  });
+
+  afterAll(async () => {
+    // Close server and database connections
+    if (server) {
+      await new Promise(resolve => server.close(resolve));
+    }
+    await sequelize.close();
+  });
+
+  describe('1. User Registration Flow', () => {
+    it('should register a new user successfully', async () => {
+      const res = await request(app)
+        .post('/api/auth/register')
+        .send(testUser)
+        .expect(201);
+
+      expect(res.body.success).toBe(true);
+      expect(res.body.data.user.username).toBe(testUser.username);
+      expect(res.body.data.user.email).toBe(testUser.email);
+      expect(res.body.data.token).toBeDefined();
+      
+      userToken = res.body.data.token;
+    });
+
+    it('should not register user with duplicate email', async () => {
+      const res = await request(app)
+        .post('/api/auth/register')
+        .send(testUser)
+        .expect(409);
+
+      expect(res.body.success).toBe(false);
+      expect(res.body.message).toContain('already');
+    });
+
+    it('should not register user with invalid email', async () => {
+      const res = await request(app)
+        .post('/api/auth/register')
+        .send({
+          username: 'testuser2',
+          email: 'invalid-email',
+          password: 'Test123!@#'
+        })
+        .expect(400);
+
+      expect(res.body.success).toBe(false);
+    });
+
+    it('should not register user with weak password', async () => {
+      const res = await request(app)
+        .post('/api/auth/register')
+        .send({
+          username: 'testuser3',
+          email: 'test3@example.com',
+          password: '123'
+        })
+        .expect(400);
+
+      expect(res.body.success).toBe(false);
+    });
+  });
+
+  describe('2. User Login Flow', () => {
+    it('should login with correct credentials', async () => {
+      const res = await request(app)
+        .post('/api/auth/login')
+        .send({
+          email: testUser.email,
+          password: testUser.password
+        })
+        .expect(200);
+
+      expect(res.body.success).toBe(true);
+      expect(res.body.data.token).toBeDefined();
+      expect(res.body.data.user.email).toBe(testUser.email);
+    });
+
+    it('should not login with incorrect password', async () => {
+      const res = await request(app)
+        .post('/api/auth/login')
+        .send({
+          email: testUser.email,
+          password: 'WrongPassword123'
+        })
+        .expect(401);
+
+      expect(res.body.success).toBe(false);
+    });
+
+    it('should not login with non-existent email', async () => {
+      const res = await request(app)
+        .post('/api/auth/login')
+        .send({
+          email: 'nonexistent@example.com',
+          password: 'Test123!@#'
+        })
+        .expect(401);
+
+      expect(res.body.success).toBe(false);
+    });
+  });
+
+  describe('3. Token Verification Flow', () => {
+    it('should verify valid token', async () => {
+      const res = await request(app)
+        .get('/api/auth/verify')
+        .set('Authorization', `Bearer ${userToken}`)
+        .expect(200);
+
+      expect(res.body.success).toBe(true);
+      expect(res.body.data.user).toBeDefined();
+    });
+
+    it('should reject invalid token', async () => {
+      const res = await request(app)
+        .get('/api/auth/verify')
+        .set('Authorization', 'Bearer invalid-token')
+        .expect(401);
+
+      expect(res.body.success).toBe(false);
+    });
+
+    it('should reject request without token', async () => {
+      const res = await request(app)
+        .get('/api/auth/verify')
+        .expect(401);
+
+      expect(res.body.success).toBe(false);
+    });
+  });
+
+  describe('4. Complete Quiz Flow', () => {
+    let quizSessionId = null;
+    let categoryId = null;
+
+    it('should get available categories', async () => {
+      const res = await request(app)
+        .get('/api/categories')
+        .set('Authorization', `Bearer ${userToken}`)
+        .expect(200);
+
+      expect(res.body.success).toBe(true);
+      expect(Array.isArray(res.body.data)).toBe(true);
+      
+      if (res.body.data.length > 0) {
+        categoryId = res.body.data[0].id;
+      }
+    });
+
+    it('should start a quiz session', async () => {
+      if (!categoryId) {
+        console.log('Skipping quiz tests - no categories available');
+        return;
+      }
+
+      const res = await request(app)
+        .post('/api/quiz/start')
+        .set('Authorization', `Bearer ${userToken}`)
+        .send({
+          categoryId: categoryId,
+          quizType: 'practice',
+          difficulty: 'easy',
+          questionCount: 5
+        })
+        .expect(201);
+
+      expect(res.body.success).toBe(true);
+      expect(res.body.data.sessionId).toBeDefined();
+      
+      quizSessionId = res.body.data.sessionId;
+    });
+
+    it('should get current quiz session', async () => {
+      if (!quizSessionId) {
+        return;
+      }
+
+      const res = await request(app)
+        .get(`/api/quiz/session/${quizSessionId}`)
+        .set('Authorization', `Bearer ${userToken}`)
+        .expect(200);
+
+      expect(res.body.success).toBe(true);
+      expect(res.body.data.id).toBe(quizSessionId);
+    });
+
+    it('should submit an answer', async () => {
+      if (!quizSessionId) {
+        return;
+      }
+
+      // Get the first question
+      const sessionRes = await request(app)
+        .get(`/api/quiz/session/${quizSessionId}`)
+        .set('Authorization', `Bearer ${userToken}`);
+
+      const questions = sessionRes.body.data.questions;
+      if (questions && questions.length > 0) {
+        const questionId = questions[0].id;
+        const correctOption = questions[0].correctOption;
+
+        const res = await request(app)
+          .post(`/api/quiz/session/${quizSessionId}/answer`)
+          .set('Authorization', `Bearer ${userToken}`)
+          .send({
+            questionId: questionId,
+            selectedOption: correctOption
+          })
+          .expect(200);
+
+        expect(res.body.success).toBe(true);
+      }
+    });
+
+    it('should complete quiz session', async () => {
+      if (!quizSessionId) {
+        return;
+      }
+
+      const res = await request(app)
+        .post(`/api/quiz/session/${quizSessionId}/complete`)
+        .set('Authorization', `Bearer ${userToken}`)
+        .expect(200);
+
+      expect(res.body.success).toBe(true);
+      expect(res.body.data.status).toBe('completed');
+    });
+  });
+
+  describe('5. Authorization Scenarios', () => {
+    it('should allow authenticated user to access protected route', async () => {
+      const res = await request(app)
+        .get('/api/user/profile')
+        .set('Authorization', `Bearer ${userToken}`)
+        .expect(200);
+
+      expect(res.body.success).toBe(true);
+    });
+
+    it('should deny unauthenticated access to protected route', async () => {
+      const res = await request(app)
+        .get('/api/user/profile')
+        .expect(401);
+
+      expect(res.body.success).toBe(false);
+    });
+
+    it('should deny non-admin access to admin route', async () => {
+      const res = await request(app)
+        .get('/api/admin/statistics')
+        .set('Authorization', `Bearer ${userToken}`)
+        .expect(403);
+
+      expect(res.body.success).toBe(false);
+    });
+
+    it('should allow admin access to admin route', async () => {
+      if (!adminToken) {
+        console.log('Skipping admin test - admin not logged in');
+        return;
+      }
+
+      const res = await request(app)
+        .get('/api/admin/statistics')
+        .set('Authorization', `Bearer ${adminToken}`)
+        .expect(200);
+
+      expect(res.body.success).toBe(true);
+    });
+  });
+
+  describe('6. Guest User Flow', () => {
+    let guestToken = null;
+    let guestId = null;
+
+    it('should create guest session', async () => {
+      const res = await request(app)
+        .post('/api/guest/session')
+        .expect(201);
+
+      expect(res.body.success).toBe(true);
+      expect(res.body.data.token).toBeDefined();
+      expect(res.body.data.guestId).toBeDefined();
+      
+      guestToken = res.body.data.token;
+      guestId = res.body.data.guestId;
+    });
+
+    it('should allow guest to access public categories', async () => {
+      const res = await request(app)
+        .get('/api/guest/categories')
+        .set('Authorization', `Bearer ${guestToken}`)
+        .expect(200);
+
+      expect(res.body.success).toBe(true);
+    });
+
+    it('should convert guest to registered user', async () => {
+      if (!guestToken) {
+        return;
+      }
+
+      const res = await request(app)
+        .post('/api/guest/convert')
+        .set('Authorization', `Bearer ${guestToken}`)
+        .send({
+          username: 'convertedguest',
+          email: 'converted@guest.com',
+          password: 'Test123!@#'
+        })
+        .expect(201);
+
+      expect(res.body.success).toBe(true);
+      expect(res.body.data.user).toBeDefined();
+      expect(res.body.data.token).toBeDefined();
+    });
+  });
+
+  describe('7. Error Handling Scenarios', () => {
+    it('should return 404 for non-existent route', async () => {
+      const res = await request(app)
+        .get('/api/nonexistent')
+        .expect(404);
+
+      expect(res.body.success).toBe(false);
+    });
+
+    it('should handle malformed JSON', async () => {
+      const res = await request(app)
+        .post('/api/auth/login')
+        .set('Content-Type', 'application/json')
+        .send('invalid json{')
+        .expect(400);
+    });
+
+    it('should validate required fields', async () => {
+      const res = await request(app)
+        .post('/api/auth/register')
+        .send({
+          username: 'test'
+          // missing email and password
+        })
+        .expect(400);
+
+      expect(res.body.success).toBe(false);
+    });
+
+    it('should handle database errors gracefully', async () => {
+      // Try to access non-existent resource
+      const res = await request(app)
+        .get('/api/quiz/session/00000000-0000-0000-0000-000000000000')
+        .set('Authorization', `Bearer ${userToken}`)
+        .expect(404);
+
+      expect(res.body.success).toBe(false);
+    });
+  });
+
+  describe('8. User Profile Flow', () => {
+    it('should get user profile', async () => {
+      const res = await request(app)
+        .get('/api/user/profile')
+        .set('Authorization', `Bearer ${userToken}`)
+        .expect(200);
+
+      expect(res.body.success).toBe(true);
+      expect(res.body.data.username).toBe(testUser.username);
+    });
+
+    it('should get user statistics', async () => {
+      const res = await request(app)
+        .get('/api/user/statistics')
+        .set('Authorization', `Bearer ${userToken}`)
+        .expect(200);
+
+      expect(res.body.success).toBe(true);
+      expect(res.body.data.totalQuizzesTaken).toBeDefined();
+    });
+
+    it('should get quiz history', async () => {
+      const res = await request(app)
+        .get('/api/user/quiz-history')
+        .set('Authorization', `Bearer ${userToken}`)
+        .expect(200);
+
+      expect(res.body.success).toBe(true);
+      expect(Array.isArray(res.body.data.sessions)).toBe(true);
+    });
+  });
+
+  describe('9. Logout Flow', () => {
+    it('should logout successfully', async () => {
+      const res = await request(app)
+        .post('/api/auth/logout')
+        .set('Authorization', `Bearer ${userToken}`)
+        .expect(200);
+
+      expect(res.body.success).toBe(true);
+    });
+
+    it('should not access protected route after logout', async () => {
+      // Note: JWT tokens are stateless, so this test depends on token expiration
+      // In a real scenario with token blacklisting, this would fail
+      // For now, we just verify the logout endpoint works
+      const res = await request(app)
+        .post('/api/auth/logout')
+        .set('Authorization', `Bearer ${userToken}`)
+        .expect(200);
+
+      expect(res.body.success).toBe(true);
+    });
+  });
+});