Senior Qa

Senior QA Engineer

Test automation, coverage analysis, and quality assurance patterns for React and Next.js applications.

Quick Start

# Generate Jest test stubs for React components python scripts/test_suite_generator.py src/components/ --output __tests__/ # Analyze test coverage from Jest/Istanbul reports python scripts/coverage_analyzer.py coverage/coverage-final.json --threshold 80 # Scaffold Playwright E2E tests for Next.js routes python scripts/e2e_test_scaffolder.py src/app/ --output e2e/

1. Test Suite Generator

Scans React/TypeScript components and generates Jest + React Testing Library test stubs with proper structure. Input: Source directory containing React components Output: Test files with describe blocks, render tests, interaction tests Usage: # Basic usage - scan components and generate tests python scripts/test_suite_generator.py src/components/ --output __tests__/ # Include accessibility tests python scripts/test_suite_generator.py src/ --output __tests__/ --include-a11y # Generate with custom template python scripts/test_suite_generator.py src/ --template custom-template.tsx Supported Patterns: Functional components with hooks Components with Context providers Components with data fetching Form components with validation

2. Coverage Analyzer

Parses Jest/Istanbul coverage reports and identifies gaps, uncovered branches, and provides actionable recommendations. Input: Coverage report (JSON or LCOV format) Output: Coverage analysis with recommendations Usage: # Analyze coverage report python scripts/coverage_analyzer.py coverage/coverage-final.json # Enforce threshold (exit 1 if below) python scripts/coverage_analyzer.py coverage/ --threshold 80 --strict # Generate HTML report python scripts/coverage_analyzer.py coverage/ --format html --output report.html

3. E2E Test Scaffolder

Scans Next.js pages/app directory and generates Playwright test files with common interactions. Input: Next.js pages or app directory Output: Playwright test files organized by route Usage: # Scaffold E2E tests for Next.js App Router python scripts/e2e_test_scaffolder.py src/app/ --output e2e/ # Include Page Object Model classes python scripts/e2e_test_scaffolder.py src/app/ --output e2e/ --include-pom # Generate for specific routes python scripts/e2e_test_scaffolder.py src/app/ --routes "/login,/dashboard,/checkout"

Unit Test Generation Workflow

Use when setting up tests for new or existing React components. Step 1: Scan project for untested components python scripts/test_suite_generator.py src/components/ --scan-only Step 2: Generate test stubs python scripts/test_suite_generator.py src/components/ --output __tests__/ Step 3: Review and customize generated tests // __tests__/Button.test.tsx (generated) import { render, screen, fireEvent } from '@testing-library/react'; import { Button } from '../src/components/Button'; describe('Button', () => { it('renders with label', () => { render(<Button>Click me</Button>); expect(screen.getByRole('button', { name: "click-mei-tobeinthedocument" }); it('calls onClick when clicked', () => { const handleClick = jest.fn(); render(<Button onClick={handleClick}>Click</Button>); fireEvent.click(screen.getByRole('button')); expect(handleClick).toHaveBeenCalledTimes(1); }); // TODO: Add your specific test cases }); Step 4: Run tests and check coverage npm test -- --coverage python scripts/coverage_analyzer.py coverage/coverage-final.json

Coverage Analysis Workflow

Use when improving test coverage or preparing for release. Step 1: Generate coverage report npm test -- --coverage --coverageReporters=json Step 2: Analyze coverage gaps python scripts/coverage_analyzer.py coverage/coverage-final.json --threshold 80 Step 3: Identify critical paths python scripts/coverage_analyzer.py coverage/ --critical-paths Step 4: Generate missing test stubs python scripts/test_suite_generator.py src/ --uncovered-only --output __tests__/ Step 5: Verify improvement npm test -- --coverage python scripts/coverage_analyzer.py coverage/ --compare previous-coverage.json

E2E Test Setup Workflow

• Use when setting up Playwright for a Next.js project.
• Step 1: Initialize Playwright (if not installed)
• npm init playwright@latest
• Step 2: Scaffold E2E tests from routes
• python scripts/e2e_test_scaffolder.py src/app/ --output e2e/
• Step 3: Configure authentication fixtures
• // e2e/fixtures/auth.ts (generated)
• import { test as base } from '@playwright/test';
• export const test = base.extend({
• authenticatedPage: async ({ page }, use) => {
• await page.goto('/login');
• await page.fill('[name="email"]', 'test@example.com');
• await page.fill('[name="password"]', 'password');
• await page.click('button[type="submit"]');
• await page.waitForURL('/dashboard');
• await use(page);
• },
• });
• Step 4: Run E2E tests
• npx playwright test
• npx playwright show-report
• Step 5: Add to CI pipeline
• # .github/workflows/e2e.yml
• name: "run-e2e-tests"
• run: npx playwright test
• name: "upload-report"
• uses: actions/upload-artifact@v3
• with:
• name: "playwright-report"
• path: playwright-report/

Reference Documentation

FileContainsUse Whenreferences/testing_strategies.mdTest pyramid, testing types, coverage targets, CI/CD integrationDesigning test strategyreferences/test_automation_patterns.mdPage Object Model, mocking (MSW), fixtures, async patternsWriting test codereferences/qa_best_practices.mdTestable code, flaky tests, debugging, quality metricsImproving test quality

React Testing Library Queries

// Preferred (accessible) screen.getByRole('button', { name: "submiti" screen.getByLabelText(/email/i) screen.getByPlaceholderText(/search/i) // Fallback screen.getByTestId('custom-element')

Async Testing

// Wait for element await screen.findByText(/loaded/i); // Wait for removal await waitForElementToBeRemoved(() => screen.queryByText(/loading/i)); // Wait for condition await waitFor(() => { expect(mockFn).toHaveBeenCalled(); });

Mocking with MSW

import { rest } from 'msw'; import { setupServer } from 'msw/node'; const server = setupServer( rest.get('/api/users', (req, res, ctx) => { return res(ctx.json([{ id: 1, name: "john" }])); }) ); beforeAll(() => server.listen()); afterEach(() => server.resetHandlers()); afterAll(() => server.close());

Playwright Locators

// Preferred page.getByRole('button', { name: "submit" }) page.getByLabel('Email') page.getByText('Welcome') // Chaining page.getByRole('listitem').filter({ hasText: 'Product' })

Coverage Thresholds (jest.config.js)

module.exports = { coverageThreshold: { global: { branches: 80, functions: 80, lines: 80, statements: 80, }, }, };

Common Commands

# Jest npm test # Run all tests npm test -- --watch # Watch mode npm test -- --coverage # With coverage npm test -- Button.test.tsx # Single file # Playwright npx playwright test # Run all E2E tests npx playwright test --ui # UI mode npx playwright test --debug # Debug mode npx playwright codegen # Generate tests # Coverage npm test -- --coverage --coverageReporters=lcov,json python scripts/coverage_analyzer.py coverage/coverage-final.json