Testing

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Overview

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Types of Tests

• Unit Tests
• Integration Tests
• End-to-End Tests
• Performance Tests

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Unit Testing

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Writing Unit Tests

// Example unit test
import { describe, it, expect } from 'vitest';
import { validateEmail } from '../utils/validation';

describe('validateEmail', () => {
  it('should validate correct email format', () => {
    expect(validateEmail('test@example.com')).toBe(true);
  });
});

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Test Coverage

• Aim for 80% or higher coverage
• Focus on critical paths
• Test edge cases

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Integration Testing

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Setting Up Integration Tests

// Example integration test
import { describe, it, expect } from 'vitest';
import { AuthClient } from '../client';

describe('AuthClient', () => {
  it('should authenticate user', async () => {
    // Placeholder test implementation
  });
});

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Test Environment

1. Configure test database
2. Mock external services
3. Set up test fixtures

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End-to-End Testing

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E2E Test Setup

// Example E2E test
import { test, expect } from '@playwright/test';

test('user can sign in', async ({ page }) => {
  // Placeholder E2E test
});

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Running E2E Tests

1. Start test environment
2. Execute test suite
3. Generate reports

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Performance Testing

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Load Testing

// Example load test
import { check } from 'k6';
import http from 'k6/http';

export default function () {
  // Placeholder load test
}

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Benchmarking

• Response times
• Concurrent users
• Resource usage

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Test Best Practices

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Writing Tests

• Keep tests focused and simple
• Use descriptive test names
• Follow AAA pattern (Arrange, Act, Assert)
• Mock external dependencies

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Test Organization

tests/
├── unit/
├── integration/
├── e2e/
└── performance/

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Continuous Integration

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CI Pipeline

1. Run linting
2. Execute unit tests
3. Run integration tests
4. Perform E2E tests
5. Check coverage

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Test Automation

# Example GitHub Actions workflow
name: Tests
on: [push, pull_request]
jobs:
  test:
    runs-on: ubuntu-latest
    steps:
      # Placeholder CI steps

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Debugging Tests

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Common Issues

• Async timing problems
• Test isolation
• Environment setup
• Flaky tests

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Tools and Techniques

• Test debugger
• Logging
• Snapshot testing
• Test runners

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Best Practices

• Write tests before code (TDD)
• Keep tests maintainable
• Use test fixtures
• Document test requirements

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Related Topics

• Development Guide
• Issue Reporting
• Contributing Overview