testing

Original：🇺🇸 English

Translated

Write effective tests for code quality and reliability. Use when implementing features, fixing bugs, or improving coverage. Covers unit, integration, and E2E testing.

8installs

Sourcenguyenhuuca/assessment

Added on2026-02-21

NPX Install

npx skill4agent add nguyenhuuca/assessment testing

SKILL.md Content

View Translation Comparison →

Testing Software

MCP Tools

Chrome DevTools (E2E testing):

Automate user flows in real browser
Capture screenshots for visual regression
Run Lighthouse for accessibility testing
Profile performance during test runs

Testing Pyramid

Unit Tests (Many): Fast, isolated, test single units
Integration Tests (Some): Test component interactions
E2E Tests (Few): Test complete user flows — use Chrome DevTools

Workflows

Analyze: Use Glob and Grep to identify untested code
Unit Tests: Cover all public functions
Edge Cases: Test boundaries and error conditions
Integration: Test external dependencies
E2E: Use Chrome DevTools for browser automation
Regression: Add test for each bug fix

Test Quality Standards

Deterministic

Tests must produce the same result every time.

Isolated

Tests should not depend on each other or shared state.

Clear

Test names should describe the behavior being tested.

Test Patterns

Arrange-Act-Assert (AAA) (Java + JUnit 5)

java

@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!");
    }
}

E2E Testing with Chrome DevTools

javascript

// 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

Commands (Java/Maven)

bash

# 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

Finding Untested Code

Use Glob and Grep to identify gaps:

Use Glob to find all source files and test files
Check which source files have corresponding test files
Use Grep to see if functions are referenced in tests