Software Testing & Automation
Software testing verifies that applications work correctly and meets requirements. Test automation uses tools and scripts to run tests automatically, catching bugs early and enabling confident, freque…
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Definition
Software testing verifies that applications work correctly and meets requirements. Test automation uses tools and scripts to run tests automatically, catching bugs early and enabling confident, frequent deployments. From unit tests to end-to-end tests, a solid testing strategy is essential for maintaining software quality as codebases grow.
Key Points
- Testing pyramid: many unit tests, fewer integration tests, fewest E2E tests
- Tools: Jest (JavaScript), pytest (Python), Cypress/Playwright (E2E), Selenium (legacy)
- Test-driven development (TDD): write tests before code for better design
- Automated tests in CI/CD prevent regressions and enable confident deployments
Frequently Asked Questions
For JavaScript/React: Jest for unit tests, React Testing Library for component tests, Playwright or Cypress for E2E tests. For Python: pytest for unit/integration tests. For mobile: Appium for cross-platform, XCTest (iOS), Espresso (Android). These tools are all open-source and have strong community support.
Aim for: 70-80% code coverage with unit tests (focus on business logic), integration tests for critical API endpoints and database operations, and E2E tests for critical user journeys (login, checkout, key features). Don't chase 100% coverage — test the code that matters most. Untested code is tech debt; over-tested code is wasted effort.
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