testing

Testing Skill

Comprehensive knowledge for QA and testing. Use these strategies and reference detailed guides for specific test types.

Testing Pyramid

        /\
       /  \     E2E Tests (few)
      /----\    - Critical user flows
     /      \   - Slow, expensive
    /--------\  Integration Tests (some)
   /          \ - Component interactions
  /------------\- API contracts
 /              \ Unit Tests (many)
/----------------\- Fast, isolated, cheap

Test Case Categories

Happy Path

• Does it work with valid input?
• Does the main flow complete successfully?

Edge Cases

• Empty input, null, undefined
• Boundary values (0, -1, MAX_INT)
• Single item vs many items
• First and last items

Error States

• Invalid input
• Network failures
• Timeout scenarios
• Missing permissions

Security Cases

• Unauthorized access attempts
• Malformed input (injection attempts)
• Rate limiting behavior

Coverage Analysis

What to Measure

• Line coverage - Which lines executed?
• Branch coverage - Which if/else paths taken?
• Function coverage - Which functions called?

Coverage Targets

Coverage Isn't Everything

• High coverage with bad tests = false confidence
• Test behavior, not implementation
• Critical paths matter more than percentage

Bug Report Format

## Bug: [Clear title describing the issue]

**Severity:** Critical / High / Medium / Low

**Environment:**
- Browser/OS: Chrome 120 / macOS 14
- App version: 1.2.3
- User role: Admin

**Steps to Reproduce:**
1. Go to /settings
2. Click "Change Password"
3. Enter password shorter than 8 characters
4. Click "Save"

**Expected Result:**
Error message "Password must be at least 8 characters"

**Actual Result:**
Form submits successfully, password unchanged, no error shown

**Evidence:**
- Screenshot: [link]
- Console errors: None
- Network: POST /api/password returned 200

**Additional Context:**
Works correctly when password is 8+ characters.
Issue may be in client-side validation.

Test Strategy Template

## Test Plan: [Feature Name]

### Scope
- What's being tested
- What's NOT being tested

### Test Cases

#### Unit Tests
- [ ] Function X handles valid input
- [ ] Function X rejects invalid input
- [ ] Function X handles edge case Y

#### Integration Tests
- [ ] Component A communicates with Service B
- [ ] API endpoint returns correct data format

#### E2E Tests
- [ ] User can complete flow from start to finish
- [ ] Error states show appropriate messages

### Risks
- Areas with less coverage
- Known flaky tests
- Dependencies on external services

Detailed References

• Test Patterns - Common testing patterns by type
• Bug Hunting - How to find bugs systematically