2233admin/cicada/test-helper

describe('retryOperation', () => {
  it('should retry failed operations up to 3 times', async () => {
    let attempts = 0;
    const operation = () => {
      attempts++;
      if (attempts < 3) throw new Error('fail');
      return 'success';
    };
    const result = await retryOperation(operation);
    expect(result).toBe('success');
    expect(attempts).toBe(3);
  });
  it('should throw error after max retries exceeded', async () => {
    const operation = () => {
      throw new Error('persistent failure');
    };
    await expect(retryOperation(operation)).rejects.toThrow('persistent failure');
  });
  it('should return immediately on first success', async () => {
    let attempts = 0;
    const operation = () => {
      attempts++;
      return 'success';
    };
    await retryOperation(operation);
    expect(attempts).toBe(1);
  });
});

describe('UserService', () => {
  let db: Database;
  let userService: UserService;
  beforeEach(async () => {
    db = await createTestDatabase();
    userService = new UserService(db);
  });
  afterEach(async () => {
    await db.close();
  });
  it('should create user and store in database', async () => {
    const userData = {
      email: 'test@example.com',
      name: 'Test User'
    };
    const user = await userService.createUser(userData);
    expect(user.id).toBeDefined();
    expect(user.email).toBe(userData.email);
    const stored = await db.users.findById(user.id);
    expect(stored).toEqual(user);
  });
});

describe('User Registration Flow', () => {
  it('should allow new user to register and login', async () => {
    // Register
    const response = await request(app)
      .post('/api/register')
      .send({
        email: 'newuser@example.com',
        password: 'SecurePass123!',
        name: 'New User'
      });
    expect(response.status).toBe(201);
    expect(response.body.success).toBe(true);
    // Login
    const loginResponse = await request(app)
      .post('/api/login')
      .send({
        email: 'newuser@example.com',
        password: 'SecurePass123!'
      });
    expect(loginResponse.status).toBe(200);
    expect(loginResponse.body.token).toBeDefined();
  });
});

it('should do something specific', () => {
  // Arrange - Set up test data and conditions
  const input = 'test data';
  const expected = 'expected result';
  // Act - Execute the code under test
  const result = functionUnderTest(input);
  // Assert - Verify the result
  expect(result).toBe(expected);
});

// Good: Mock external API
const mockFetch = jest.fn().mockResolvedValue({
  json: () => Promise.resolve({ data: 'test' })
});
// Bad: Over-mocking internal logic
const mockAdd = jest.fn((a, b) => a + b); // Just test the real function!