QA Expert Skill | Agent Skills

QA Expert

Quality assurance specialist for developing comprehensive testing strategies and quality gates.

When This Skill Activates

Activates when you:

Ask for QA strategy
Need quality gates
Want to improve test coverage
Plan testing approach

Quality Assurance Strategy

1. Risk-Based Testing

Prioritize testing based on risk:

| Risk Level | Testing Approach | |------------|------------------| | Critical (Money, Security, Data) | 100% automation, chaos testing | | High (Core features) | Full E2E, integration, unit | | Medium (Secondary features) | Integration, unit | | Low (Edge features) | Unit tests only |

2. Testing Pyramid Allocation

| Level | % of Tests | Focus | |-------|------------|-------| | E2E | 10% | Critical user journeys | | Integration | 30% | API interactions | | Unit | 60% | Business logic, utilities |

3. Quality Gates

Pre-Commit

- Lint: npm run lint
- Format check: npm run format:check
- Type check: npm run type-check
- Unit tests: npm run test:unit

Pre-Merge

- All tests: npm test
- Coverage threshold: > 80%
- Security scan: npm audit
- License check: npm run check:licenses

Pre-Production

- Full test suite: npm run test:all
- E2E tests: npm run test:e2e
- Performance tests: npm run test:perf
- Security audit: npm audit --audit-level high

Test Categories

Functional Testing

Purpose: Verify features work as specified

Happy path testing
Edge case testing
Boundary value analysis
Error handling

Non-Functional Testing

Performance

Response time < 200ms (p95)
Throughput > 1000 req/s
Memory usage stable
No memory leaks

Security

OWASP Top 10 coverage
Penetration testing
Dependency vulnerability scan
Secrets detection

Compatibility

Browser testing (Chrome, Firefox, Safari, Edge)
Device testing (Mobile, Desktop, Tablet)
OS testing (Windows, macOS, Linux)
Version testing (N-1 browser versions)

Regression Testing

Previous bugs don't reappear
New features don't break existing features
Performance doesn't degrade

Exploratory Testing

Find unexpected issues
Test edge cases
User experience issues

Test Planning

Test Plan Template

# Test Plan: [Feature Name]

## Overview
[Feature description]

## Scope
[In scope / Out of scope]

## Test Cases

### Functional
- [ ] TC001: [Description]
- [ ] TC002: [Description]

### Integration
- [ ] TC101: [Description]

### E2E
- [ ] TC201: [Description]

## Test Data
[Required test data]

## Environment
[Test environment setup]

## Schedule
[Testing timeline]

## Exit Criteria
[Definition of done]

Quality Metrics

Code Quality

Test Coverage: > 80%
Cyclomatic Complexity: < 10 per function
Code Duplication: < 5%
Technical Debt Ratio: < 5%

Defect Metrics

Defect Density: < 1 defect per 1000 LOC
Critical Defects: 0
High Defects: 0
Medium Defects: < 3

Test Metrics

Test Pass Rate: > 95%
Flaky Tests: 0
Test Execution Time: < 10 minutes

Automation Strategy

Automate When

Test is run frequently
Test has deterministic results
Test is stable
ROI justifies automation cost

Don't Automate When

Test requires human judgment
Test is exploratory
Test is one-time only
Test changes frequently

Bug Report Template

## Bug Summary
[One-line summary]

## Severity
Critical / High / Medium / Low

## Steps to Reproduce
1.
2.
3.

## Expected Behavior
[What should happen]

## Actual Behavior
[What actually happens]

## Environment
- OS:
- Browser:
- Version:

## Attachments
[Screenshots, logs, etc.]

Scripts

Generate test plan:

python scripts/generate_test_plan.py <feature>

Analyze test coverage:

python scripts/coverage_analysis.py

References

references/strategy.md - Testing strategies
references/gates.md - Quality gate definitions
references/metrics.md - QA metrics and KPIs

Agent Skills: QA Expert

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