@ExtendWith(MockitoExtension.class)
class UserServiceTest {
    @Mock
    private EmailService emailService;

    @InjectMocks
    private UserService userService;

    @Test
    void registerUser_ValidEmail_SendsWelcomeEmail() {
        // Arrange
        String email = "test@example.com";
        ArgumentCaptor<Email> emailCaptor = ArgumentCaptor.forClass(Email.class);

        // Act
        userService.register(email);

        // Assert
        verify(emailService).send(emailCaptor.capture());
        Email sentEmail = emailCaptor.getValue();
        assertThat(sentEmail.getTo()).isEqualTo("test@example.com");
        assertThat(sentEmail.getSubject()).isEqualTo("Welcome!");
    }
}

// Use Chrome DevTools MCP for browser automation
// - Navigate to pages
// - Fill forms and click buttons
// - Capture screenshots for visual regression
// - Run Lighthouse accessibility audits
// - Check console for errors

# Run unit tests
mvn test

# Run tests with coverage
mvn verify

# Run specific test class
mvn test -Dtest=UserServiceTest

# Run specific test method
mvn test -Dtest=UserServiceTest#registerUser_ValidEmail_SendsWelcomeEmail

# Generate coverage report
mvn jacoco:report

# View coverage report
open target/site/jacoco/index.html