test-automation

name	test-automation
description	Create and execute automated test suites with comprehensive coverage for unit, integration, and E2E testing
allowed-tools	Read, Write, Edit, Bash, Glob, Grep

Test Automation Skill

Create comprehensive automated tests ensuring code quality and reliability.

When to Use

• Writing unit tests for new code
• Creating integration tests
• Setting up E2E test suites
• Measuring code coverage
• Validating bug fixes

Test Types

Unit Tests

• Test individual functions/methods
• Mock external dependencies
• Fast execution (<1ms per test)
• High coverage (>80%)

Integration Tests

• Test component interactions
• Use real dependencies (database, APIs)
• Validate data flow
• Test error scenarios

E2E Tests

• Test complete user flows
• Browser automation
• API workflow testing
• Performance validation

Test Structure (AAA Pattern)

describe('Feature', () => {
  it('should do expected behavior', () => {
    // Arrange - Set up test data
    const input = { ... };

    // Act - Execute the code
    const result = functionUnderTest(input);

    // Assert - Verify outcome
    expect(result).toEqual(expected);
  });
});

Coverage Requirements

Type	Minimum	Target
Statements	70%	85%
Branches	65%	80%
Functions	75%	90%
Lines	70%	85%

Test Commands

# Run all tests
npm test

# Run with coverage
npm test -- --coverage

# Run specific test file
npm test -- path/to/test.spec.js

# Run in watch mode
npm test -- --watch

# Generate coverage report
npm test -- --coverage --coverageReporters=html

Best Practices

1. Test behavior, not implementation - Focus on what, not how
2. One assertion per test - Keep tests focused
3. Descriptive test names - "should return X when Y"
4. Independent tests - No shared state between tests
5. Fast tests - Slow tests don't get run
6. Deterministic - Same input = same output

Edge Cases to Test

• Empty inputs
• Null/undefined values
• Boundary values (0, -1, MAX_INT)
• Invalid data types
• Large datasets
• Concurrent operations
• Network failures
• Timeout scenarios

Test Report Format

# Test Results

**Total**: X tests
**Passed**: Y
**Failed**: Z
**Coverage**: X%

## Failed Tests
1. [Test name] - [Reason]

## Coverage Gaps
- [File]: [Lines not covered]

## Recommendations
- [Suggested additional tests]