Write, run, and manage unit, integration, and E2E tests across TypeScript, Python, and Swift using recommended frameworks.
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Write and run tests across languages and frameworks.
| Language | Unit Tests | Integration | E2E |
|---|---|---|---|
| TypeScript/JS | Vitest (preferred), Jest | Supertest | Playwright |
| Python | pytest | pytest + httpx | Playwright |
| Swift | XCTest | XCTest | XCUITest |
npm install -D vitest @testing-library/react @testing-library/jest-dom
// vitest.config.ts import { defineConfig } from 'vitest/config' export default defineConfig({ test: { globals: true, environment: 'jsdom', setupFiles: './tests/setup.ts', }, })
npx vitest # Watch mode npx vitest run # Single run npx vitest --coverage # With coverage
npm install -D jest @types/jest ts-jest
npx jest # Run all npx jest --watch # Watch mode npx jest --coverage # With coverage npx jest path/to/test # Single file
uv pip install pytest pytest-cov pytest-asyncio httpx
pytest # Run all pytest -v # Verbose pytest -x # Stop on first failure pytest --cov=app # With coverage pytest tests/test_api.py -k "test_login" # Specific test pytest --tb=short # Short tracebacks
swift test # Run all tests swift test --filter MyTests # Specific test suite swift test --parallel # Parallel execution
npm install -D @playwright/test npx playwright install
npx playwright test # Run all npx playwright test --headed # With browser visible npx playwright test --debug # Debug mode npx playwright test --project=chromium # Specific browser npx playwright show-report # View HTML report
┌─────────┐ ┌─────────┐ ┌──────────┐ │ Write │────▶│ Write │────▶│ Refactor │──┐ │ Test │ │ Code │ │ Code │ │ │ (Red) │ │ (Green) │ │ │ │ └─────────┘ └─────────┘ └──────────┘ │ ▲ │ └──────────────────────────────────────────┘
test('calculates total with tax', () => { // Arrange const cart = new Cart([{ price: 100, qty: 2 }]);// Act const total = cart.totalWithTax(0.08);
// Assert expect(total).toBe(216); });
test('fetches user data', async () => { const user = await getUser('123'); expect(user.name).toBe('Colt'); });
import { vi } from 'vitest';const mockFetch = vi.fn().mockResolvedValue({ json: () => Promise.resolve({ id: 1, name: 'Test' }), }); vi.stubGlobal('fetch', mockFetch);
import pytest from httpx import AsyncClient from app.main import app@pytest.mark.asyncio async def test_get_users(): async with AsyncClient(app=app, base_url="http://test") as client: response = await client.get("/users") assert response.status_code == 200 assert isinstance(response.json(), list)
import { render, screen, fireEvent } from '@testing-library/react'; import { Button } from './Button';test('calls onClick when clicked', () => { const handleClick = vi.fn(); render(<Button onClick={handleClick}>Click me</Button>); fireEvent.click(screen.getByText('Click me')); expect(handleClick).toHaveBeenCalledOnce(); });
# JavaScript/TypeScript npx vitest --coverage # Vitest (uses v8 or istanbul) npx jest --coverage # JestPython
pytest --cov=app --cov-report=html # HTML report pytest --cov=app --cov-report=term # Terminal output pytest --cov=app --cov-fail-under=80 # Fail if < 80%
View HTML coverage report
open coverage/index.html # macOS open htmlcov/index.html # Python
Always test:
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