How to Create a Testing Framework
Set up a comprehensive testing infrastructure with unit, integration, and end-to-end tests for your application.
What You'll Learn
This intermediate-level guide walks you through how to create a testing framework step by step. Estimated time: 14 min.
Step 1: Choose your testing tools
Select Vitest for unit tests, Playwright for E2E tests, and React Testing Library for component testing in a modern stack.
Step 2: Configure the test environment
Set up test databases, mock servers, environment variables, and test utilities for consistent test execution.
Step 3: Write effective unit tests
Test business logic, utility functions, and components in isolation with proper mocking and assertion patterns.
Step 4: Build integration tests
Test API endpoints, database operations, and service interactions with realistic test data and proper cleanup.
Step 5: Implement E2E test suite
Write Playwright tests for critical user flows including authentication, core features, and payment processing.
Frequently Asked Questions
How much test coverage should I aim for?▾
80% coverage on business-critical code, 60% overall. Focus on testing behavior and edge cases rather than chasing 100% coverage on every file.
How do I test database interactions?▾
Use a separate test database, run migrations before tests, seed test data, and clean up after each test. Docker Compose simplifies test database management.
How do I keep tests fast?▾
Parallelize test execution, use in-memory databases for unit tests, mock external APIs, and only run full E2E suite in CI while running unit tests locally.