test-generation

name	test-generation
description	Master skill for intelligent test case generation. Identifies technology stack and delegates to specialized testing sub-skills for creating high-quality integration and API tests.

Test Generation Framework

Instructions

You are the entry point for test case generation and quality assurance. Your goal is to Identify the technology stack, Prioritize testable components, Generate comprehensive tests, and Document the testing strategy.

Core Test Generation Process

Phase 1: Discovery & Analysis

1. Technology Stack Detection: Identify languages, frameworks, and testing tools
2. Component Mapping: Enumerate all testable endpoints (APIs, services, workflows)
3. Dependency Review: Check existing test frameworks and libraries
4. Coverage Analysis: Assess current test coverage if tests exist

Phase 2: Test Scope Prioritization

A. Components to ALWAYS Test

• API Endpoints: All HTTP routes (GET, POST, PUT, PATCH, DELETE)
• Service Layer Functions: Business logic orchestration and data processing
• Main Execution Functions: Functions that call multiple sub-functions
• Database Operations: CRUD operations, queries, transactions
• Authentication & Authorization: Login flows, token validation, permissions
• Integration Points: External APIs, message queues, webhooks
• Critical Workflows: Payment processing, order fulfillment, user registration

B. Components to AVOID Testing

• Simple Utility Functions: String formatters, basic validators (unless complex)
• Framework Generated Code: ORM models, auto-generated getters/setters
• Third-Party Libraries: Already tested by maintainers
• Pure Configuration: JSON/YAML without logic

Phase 3: Test Type Selection

A. Integration Tests (Primary Focus - 70%)

Concept: Test how components work together in realistic scenarios. Action:

1. API Integration: Test endpoints with database interactions
2. Service Integration: Test services with real/mocked external dependencies
3. Database Integration: Use test containers or in-memory databases
4. End-to-End Workflows: Multi-step business processes

B. Unit Tests (Secondary Focus - 20%)

Concept: Test isolated, complex business logic only. Action:

1. Complex Algorithms: Functions with intricate logic and edge cases
2. Business Rules: State machines, validation engines
3. Calculations: Financial calculations, data transformations

C. Contract Tests (10%)

Concept: Ensure API stability and compatibility. Action:

1. Schema Validation: Request/response structure verification
2. API Versioning: Backward compatibility checks
3. Integration Contracts: External API mock validation

Phase 4: Test Generation

Test Structure Standards

All generated tests must follow the AAA (Arrange-Act-Assert) pattern:

describe('Component/Function Name', () => {
  it('should [expected behavior] when [condition]', () => {
    // Arrange: Set up test data and dependencies
    const testData = createTestData();
    const mockDependency = mockService();
    
    // Act: Execute the function under test
    const result = functionUnderTest(testData);
    
    // Assert: Verify expected outcomes
    expect(result).toMatchExpectedValue();
    expect(mockDependency).toHaveBeenCalledWith(expectedArgs);
  });
});

Coverage Requirements

For each testable component, generate tests that cover:

1. Happy Path: Normal, expected flow
2. Edge Cases: Boundary values, empty inputs, null handling
3. Error Scenarios: Invalid inputs, network failures, timeout handling
4. Security Cases: Authentication failures, authorization violations, injection attempts

Test Data Management

1. Use Factory Functions: Generate realistic test data programmatically
2. Create Fixtures: Define reusable test datasets
3. Avoid Hardcoding: Use constants and data generators
4. Realistic Data: Mirror production data patterns

Phase 5: Documentation Generation

Test Report Structure

Generate comprehensive test documentation in test-reports/ folder:

test-reports/
├── index.md                    # Test coverage summary
├── test-plan.md                # Testing strategy and scope
├── integration-tests/
│   ├── api-tests.md           # API endpoint test docs
│   ├── service-tests.md       # Service layer test docs
│   └── workflow-tests.md      # E2E workflow test docs
├── coverage/
│   ├── coverage-summary.md    # Code coverage metrics
│   └── gaps-analysis.md       # Coverage gaps
└── execution/
    ├── setup-guide.md         # How to run tests
    └── ci-integration.md      # CI/CD pipeline guide

Technology-Specific Testing Patterns

Node.js / JavaScript Testing

Focus Areas: API testing, async operations, service integration Key Frameworks: Jest, Vitest, Mocha + Chai, Supertest Patterns:

• API endpoint testing with Supertest
• Service layer mocking with Jest
• Database testing with mongodb-memory-server
• Async/await test patterns Refer to node_testing.md for detailed patterns.

Python Testing

Focus Areas: API testing, fixtures, parametrized tests Key Frameworks: Pytest, unittest, FastAPI TestClient Patterns:

• FastAPI/Django/Flask API testing
• Pytest fixtures for setup/teardown
• Parametrized tests for similar scenarios
• SQLAlchemy integration testing Refer to python_testing.md for detailed patterns.

Java / Kotlin Testing

Focus Areas: Spring Boot testing, REST API testing, JPA integration Key Frameworks: JUnit 5, Mockito, Spring Boot Test, RestAssured Patterns:

• @SpringBootTest for integration tests
• MockMvc for API testing
• TestContainers for database testing
• JPA repository testing Refer to java_testing.md for detailed patterns.

.NET / C# Testing

Focus Areas: ASP.NET Core testing, Entity Framework, API integration Key Frameworks: xUnit, NUnit, MSTest, FluentAssertions, Moq Patterns:

• WebApplicationFactory for API tests
• In-memory databases for EF Core
• Mocking with Moq
• Integration test slices Refer to dotnet_testing.md for detailed patterns.

Go Testing

Focus Areas: HTTP handlers, table-driven tests, interface testing Key Frameworks: testing package, testify, httptest Patterns:

• Table-driven test patterns
• httptest for HTTP handler testing
• Interface mocking
• Subtests for organized test cases Refer to go_testing.md for detailed patterns.

PHP Testing

Focus Areas: Laravel/Symfony testing, database factories, feature tests Key Frameworks: PHPUnit, Pest, Laravel Dusk Patterns:

• Laravel HTTP tests
• Database factories and seeders
• Feature vs unit tests
• Browser testing with Dusk Refer to php_testing.md for detailed patterns.

Rust Testing

Focus Areas: Unit tests, integration tests, async testing Key Frameworks: Built-in test framework, mockall, tokio-test Patterns:

• Module-level unit tests
• Integration test directory structure
• Async test patterns with tokio
• Mock traits with mockall Refer to rust_testing.md for detailed patterns.

React / Frontend Testing

Focus Areas: Component testing, user interaction, integration tests Key Frameworks: Vitest, Jest, React Testing Library, Cypress Patterns:

• Component rendering tests
• User event simulation
• API mocking with MSW
• E2E tests with Cypress Refer to react_testing.md for detailed patterns.

Vue.js Testing

Focus Areas: Component testing, Vuex, composables testing Key Frameworks: Vitest, Vue Test Utils, Cypress Patterns:

• Component mounting and testing
• Vuex store testing
• Composables testing
• Router testing Refer to vue_testing.md for detailed patterns.

Next.js Testing

Focus Areas: API routes, page components, SSR/SSG testing Key Frameworks: Jest, Vitest, Playwright, Cypress Patterns:

• API route testing
• Page component testing
• Server-side rendering tests
• E2E testing with Playwright Refer to next_testing.md for detailed patterns.

NestJS Testing

Focus Areas: Controller testing, service testing, E2E testing Key Frameworks: Jest, Supertest, @nestjs/testing Patterns:

• Unit tests with TestingModule
• E2E tests with Supertest
• Mocking providers
• Database integration tests Refer to nest_testing.md for detailed patterns.

React Native Testing

Focus Areas: Component testing, navigation, native module mocking Key Frameworks: Jest, React Native Testing Library, Detox Patterns:

• Component testing
• Navigation testing
• Native module mocking
• E2E with Detox Refer to react_native_testing.md for detailed patterns.

Test Quality Standards

Readability

• ✅ Clear, descriptive test names: should reject payment when card is expired
• ✅ Self-documenting: Test describes the behavior being verified
• ✅ Minimal logic: Tests should be straightforward, not complex
• ✅ Follow AAA pattern: Arrange, Act, Assert

Isolation

• ✅ Independent tests: Each test can run alone or in any order
• ✅ Clean state: Reset databases, clear caches between tests
• ✅ No shared state: Avoid global variables or test interdependencies
• ✅ Parallel execution: Tests can run concurrently

Performance

• ✅ Fast execution: Integration tests should complete in seconds
• ✅ Parallel ready: Design tests to run concurrently
• ✅ Optimize setup: Use beforeAll/beforeEach wisely
• ✅ Clean teardown: Proper cleanup after tests

Maintainability

• ✅ DRY principle: Extract common setup into helpers
• ✅ Consistent patterns: Use the same approach across codebase
• ✅ Version controlled: Treat test code like production code
• ✅ Well documented: Comment complex test scenarios

Mocking Strategy

When to Mock

MOCK external dependencies:

• External APIs and third-party services
• Email/SMS services
• Payment gateways
• File systems (in unit tests)
• Time/date functions

DON'T MOCK for integration tests:

• Databases (use test containers instead)
• Internal services (test real interactions)
• Simple utilities
• Framework functions

Mocking Patterns

// Node.js - Jest mocking
jest.mock('external-service');
const mockService = require('external-service');
mockService.someMethod.mockResolvedValue({ data: 'test' });

// Python - Pytest fixtures
@pytest.fixture
def mock_external_api(mocker):
    return mocker.patch('app.services.external_api.call')

// Java - Mockito
@Mock
private ExternalService externalService;
when(externalService.getData()).thenReturn(testData);

// .NET - Moq
var mockService = new Mock<IExternalService>();
mockService.Setup(x => x.GetData()).Returns(testData);

Output Format

Generated Test File Template

// tests/integration/api/users.test.{ext}

// Imports for test framework and utilities
import { test framework imports };
import { application imports };
import { test helpers and fixtures };

// Describe test suite
describe('API: User Endpoints', () => {
  // Setup/teardown hooks
  beforeAll(async () => {
    // Initialize test database, server, etc.
  });
  
  afterAll(async () => {
    // Cleanup resources
  });
  
  beforeEach(async () => {
    // Reset state before each test
  });
  
  // Test cases following AAA pattern
  describe('POST /api/users', () => {
    it('should create user with valid data', async () => {
      // Arrange
      const userData = createValidUserData();
      
      // Act
      const response = await makeRequest('POST', '/api/users', userData);
      
      // Assert
      expect(response.status).toBe(201);
      expect(response.body).toMatchObject({
        id: expect.any(String),
        email: userData.email
      });
    });
    
    it('should reject invalid email format', async () => {
      // Arrange
      const invalidData = { ...validData, email: 'invalid' };
      
      // Act
      const response = await makeRequest('POST', '/api/users', invalidData);
      
      // Assert
      expect(response.status).toBe(400);
      expect(response.body.error).toContain('email');
    });
  });
});

Best Practices

Test Organization

• Group related tests using describe/context blocks
• Mirror source code directory structure
• Use clear, descriptive file names
• Separate unit tests from integration tests

Test Data

• Use factory functions for test data creation
• Create reusable fixtures
• Use realistic data that mimics production
• Clean up test data after tests

Assertions

• Use specific assertions (toBe, toEqual, toContain)
• Assert on behavior, not implementation
• Include negative assertions where appropriate
• Check both success and error cases

Error Handling

• Test error scenarios explicitly
• Verify error messages and status codes
• Test exception handling
• Check error recovery mechanisms

References

For detailed, language-specific testing patterns and examples, refer to the individual skill files in this directory.