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Testing shows the presence, not the absence of bugs.
Software testing is the process of checking if your code works correctly. It's like test-driving a car before buying it — you want to make sure everything works as expected before it's used in production.
Types of Tests:
- Unit tests: Test individual functions or components in isolation
- Integration tests: Test how different parts work together
- End-to-end tests: Test the entire application flow
- Manual testing: Humans test the software
- Automated testing: Code tests code
Why Test:
- Catch bugs early: Find problems before users do
- Confidence: Make changes without fear of breaking things
- Documentation: Tests show how code should work
- Refactoring: Safely improve code structure
Testing Pyramid:
- Many unit tests: Fast, cheap, test small pieces
- Some integration tests: Test component interactions
- Few E2E tests: Slow, expensive, test full flows
FAQ
How much testing is enough?
Aim for good coverage of critical paths. 100% coverage isn't always necessary, but test the important stuff.
What's TDD?
Test-Driven Development: write tests first, then write code to make them pass. It helps design better code.
Do I need to test everything?
Focus on business logic and critical paths. Simple getters/setters might not need tests, but complex logic definitely does.