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Rafal Lagowski edited this page Sep 14, 2025 · 1 revision

Testing Strategies

ClaudeAutoPM enforces Test-Driven Development (TDD) and provides comprehensive testing strategies that ensure code quality, reliability, and maintainability. All testing happens in Docker containers to ensure consistency across environments.

Core Philosophy

Based on .claude/rules/tdd.enforcement.md:

"No code without tests. No merge without passing tests."

TDD Enforcement

  1. Write test first - Define expected behavior
  2. See test fail - Verify test catches missing functionality
  3. Write code - Implement minimal solution
  4. See test pass - Verify implementation
  5. Refactor - Improve code with safety net

Test Categories

Unit Tests

Purpose: Test individual components in isolation Location: test/unit/ Runner: Framework-specific (Jest, pytest, go test) Coverage Target: 80% minimum

# Run unit tests
docker-compose run app npm run test:unit

Integration Tests

Purpose: Test component interactions Location: test/integration/ Runner: Framework-specific with real dependencies Coverage Target: 70% minimum

# Run integration tests
docker-compose run app npm run test:integration

End-to-End Tests

Purpose: Test complete user workflows Location: test/e2e/ Runner: Playwright, Cypress, Selenium Coverage Target: Critical paths 100%

# Run E2E tests
docker-compose run e2e npm run test:e2e

Security Tests

Purpose: Identify vulnerabilities Location: test/security/ Runner: Custom security scanners Frequency: Every PR, nightly full scan

# Run security tests
docker-compose run app npm run test:security

Performance Tests

Purpose: Ensure performance requirements Location: test/performance/ Runner: K6, JMeter, custom benchmarks Frequency: Before release, weekly

# Run performance tests
docker-compose run perf npm run test:performance

Container-Based Testing

All tests run in Docker containers for consistency:

Test Container Configuration

# docker-compose.test.yml
version: '3.8'

services:
  app:
    build:
      context: .
      target: test
    command: npm test
    environment:
      - NODE_ENV=test
      - CI=true
    volumes:
      - .:/app
      - /app/node_modules

  db-test:
    image: postgres:14
    environment:
      - POSTGRES_DB=test_db
      - POSTGRES_USER=test
      - POSTGRES_PASSWORD=test

  e2e:
    image: mcr.microsoft.com/playwright:v1.40.0
    command: npm run test:e2e
    depends_on:
      - app
    environment:
      - PLAYWRIGHT_BASE_URL=http://app:3000

Running Tests in Containers

# All tests
docker-compose -f docker-compose.test.yml run app

# Specific test suite
docker-compose run app npm run test:unit

# With coverage
docker-compose run app npm run test:coverage

# Watch mode (development)
docker-compose run app npm run test:watch

Test Structure

JavaScript/TypeScript (Jest)

// user.test.js
describe('User Service', () => {
  let userService;
  let mockDatabase;

  beforeEach(() => {
    mockDatabase = createMockDatabase();
    userService = new UserService(mockDatabase);
  });

  describe('createUser', () => {
    it('should create user with valid data', async () => {
      // Arrange
      const userData = {
        email: 'test@example.com',
        name: 'Test User'
      };

      // Act
      const user = await userService.createUser(userData);

      // Assert
      expect(user).toHaveProperty('id');
      expect(user.email).toBe(userData.email);
      expect(mockDatabase.save).toHaveBeenCalledWith(userData);
    });

    it('should throw error for duplicate email', async () => {
      // Arrange
      mockDatabase.findByEmail.mockResolvedValue({ id: 1 });

      // Act & Assert
      await expect(userService.createUser({
        email: 'existing@example.com'
      })).rejects.toThrow('Email already exists');
    });
  });
});

Python (pytest)

# test_user_service.py
import pytest
from unittest.mock import Mock, patch
from services.user import UserService

class TestUserService:
    @pytest.fixture
    def user_service(self):
        mock_db = Mock()
        return UserService(mock_db)

    def test_create_user_success(self, user_service):
        # Arrange
        user_data = {
            'email': 'test@example.com',
            'name': 'Test User'
        }

        # Act
        user = user_service.create_user(user_data)

        # Assert
        assert user['email'] == user_data['email']
        assert 'id' in user
        user_service.db.save.assert_called_once_with(user_data)

    def test_create_user_duplicate_email(self, user_service):
        # Arrange
        user_service.db.find_by_email.return_value = {'id': 1}

        # Act & Assert
        with pytest.raises(ValueError, match="Email already exists"):
            user_service.create_user({'email': 'existing@example.com'})

Go

// user_test.go
package services

import (
    "testing"
    "github.com/stretchr/testify/assert"
    "github.com/stretchr/testify/mock"
)

func TestCreateUser(t *testing.T) {
    t.Run("creates user with valid data", func(t *testing.T) {
        // Arrange
        mockDB := new(MockDatabase)
        service := NewUserService(mockDB)
        userData := User{
            Email: "test@example.com",
            Name:  "Test User",
        }

        mockDB.On("Save", userData).Return(nil)

        // Act
        user, err := service.CreateUser(userData)

        // Assert
        assert.NoError(t, err)
        assert.NotEmpty(t, user.ID)
        assert.Equal(t, userData.Email, user.Email)
        mockDB.AssertExpectations(t)
    })
}

E2E Testing with Playwright

Page Object Model

// pages/LoginPage.js
class LoginPage {
  constructor(page) {
    this.page = page;
    this.emailInput = page.locator('#email');
    this.passwordInput = page.locator('#password');
    this.submitButton = page.locator('button[type="submit"]');
    this.errorMessage = page.locator('.error-message');
  }

  async navigate() {
    await this.page.goto('/login');
  }

  async login(email, password) {
    await this.emailInput.fill(email);
    await this.passwordInput.fill(password);
    await this.submitButton.click();
  }

  async getErrorMessage() {
    return await this.errorMessage.textContent();
  }
}

E2E Test Implementation

// tests/login.spec.js
import { test, expect } from '@playwright/test';
import { LoginPage } from '../pages/LoginPage';

test.describe('Login Flow', () => {
  test('successful login redirects to dashboard', async ({ page }) => {
    const loginPage = new LoginPage(page);

    await loginPage.navigate();
    await loginPage.login('user@example.com', 'password123');

    await expect(page).toHaveURL('/dashboard');
    await expect(page.locator('h1')).toContainText('Dashboard');
  });

  test('invalid credentials show error', async ({ page }) => {
    const loginPage = new LoginPage(page);

    await loginPage.navigate();
    await loginPage.login('invalid@example.com', 'wrong');

    const error = await loginPage.getErrorMessage();
    expect(error).toBe('Invalid email or password');
  });
});

CI/CD Integration

GitHub Actions

# .github/workflows/test.yml
name: Test Suite

on: [push, pull_request]

jobs:
  test:
    runs-on: ubuntu-latest

    services:
      postgres:
        image: postgres:14
        env:
          POSTGRES_PASSWORD: test
        options: >-
          --health-cmd pg_isready
          --health-interval 10s
          --health-timeout 5s
          --health-retries 5

    steps:
      - uses: actions/checkout@v3

      - name: Run Unit Tests
        run: docker-compose run app npm run test:unit

      - name: Run Integration Tests
        run: docker-compose run app npm run test:integration

      - name: Run E2E Tests
        run: docker-compose run e2e npm run test:e2e

      - name: Upload Coverage
        uses: codecov/codecov-action@v3
        with:
          files: ./coverage/lcov.info

Test Coverage

Coverage Requirements

// package.json
{
  "jest": {
    "coverageThreshold": {
      "global": {
        "branches": 80,
        "functions": 80,
        "lines": 80,
        "statements": 80
      }
    }
  }
}

Coverage Reports

# Generate coverage report
docker-compose run app npm run test:coverage

# View HTML report
open coverage/index.html

# Check coverage in CI
docker-compose run app npm run test:coverage:ci

Agent-Driven Testing

Using Test Agents

# Generate tests
@test-runner create unit tests for UserService

# Run specific tests
@test-runner execute tests for authentication module

# Analyze failures
@test-runner analyze failing tests and suggest fixes

E2E Test Generation

@e2e-test-engineer create tests for user registration flow:
1. Navigate to signup page
2. Fill in registration form
3. Submit and verify email
4. Complete verification
5. Login with new account

Testing Best Practices

1. Test Naming

// Good: Descriptive and specific
it('should return 404 when user does not exist', ...)

// Bad: Vague
it('should work', ...)

2. AAA Pattern

it('should calculate total with tax', () => {
  // Arrange
  const items = [{ price: 100 }, { price: 50 }];
  const taxRate = 0.1;

  // Act
  const total = calculateTotal(items, taxRate);

  // Assert
  expect(total).toBe(165); // 150 + 15 tax
});

3. Test Isolation

beforeEach(() => {
  // Reset state before each test
  database.clear();
  cache.flush();
});

afterEach(() => {
  // Clean up after each test
  mockServer.reset();
});

4. Avoid Test Interdependence

// Bad: Tests depend on order
it('test 1', () => {
  global.user = createUser();
});

it('test 2', () => {
  updateUser(global.user); // Depends on test 1
});

// Good: Independent tests
it('test 1', () => {
  const user = createUser();
  // Use user
});

it('test 2', () => {
  const user = createUser(); // Create own user
  updateUser(user);
});

Performance Testing

Load Testing with K6

// load-test.js
import http from 'k6/http';
import { check } from 'k6';

export let options = {
  stages: [
    { duration: '2m', target: 100 }, // Ramp up
    { duration: '5m', target: 100 }, // Stay at 100 users
    { duration: '2m', target: 0 },   // Ramp down
  ],
  thresholds: {
    http_req_duration: ['p(95)<500'], // 95% of requests under 500ms
    http_req_failed: ['rate<0.1'],    // Error rate under 10%
  },
};

export default function() {
  let response = http.get('http://app:3000/api/users');
  check(response, {
    'status is 200': (r) => r.status === 200,
    'response time < 500ms': (r) => r.timings.duration < 500,
  });
}

Security Testing

OWASP Checks

// security.test.js
describe('Security Tests', () => {
  it('should prevent SQL injection', async () => {
    const maliciousInput = "'; DROP TABLE users; --";
    const response = await request(app)
      .post('/api/search')
      .send({ query: maliciousInput });

    expect(response.status).toBe(400);
    expect(response.body.error).toContain('Invalid input');
  });

  it('should prevent XSS attacks', async () => {
    const xssPayload = '<script>alert("XSS")</script>';
    const response = await request(app)
      .post('/api/comments')
      .send({ content: xssPayload });

    const saved = await getComment(response.body.id);
    expect(saved.content).not.toContain('<script>');
  });
});

Debugging Failed Tests

Using Test Containers

# Run tests with debugging
docker-compose run app npm run test:debug

# Access container for investigation
docker-compose run app sh
> npm test -- --verbose
> npm test -- --detectOpenHandles

Visual Debugging (Playwright)

# Run with headed browser
docker-compose run -e HEADLESS=false e2e npm run test:e2e

# Debug mode
docker-compose run e2e npx playwright test --debug

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