Testing Strategies Skill
Systematic testing for confidence without over-testing.
Testing Pyramid
| Level | Volume | Speed | Purpose |
|---|---|---|---|
| Unit | Many | Fast | Individual functions |
| Integration | Some | Medium | Component boundaries |
| E2E | Few | Slow | User journeys |
Anti-pattern: Inverted pyramid (too many E2E, few unit).
Unit Test Pattern (AAA)
typescript
test('should [behavior] when [condition]', () => {
// Arrange - setup
// Act - execute
// Assert - verify
});
What to Mock
| Mock | Don't Mock |
|---|---|
| External services | Your own code |
| Time/randomness | Pure functions |
| Network calls | Business logic |
Coverage Philosophy
| Range | Interpretation |
|---|---|
| 50-70% | Reasonable |
| 70-85% | Good, diminishing returns |
| 85%+ | Often wasteful |
Focus: Coverage of changed code.
Don't Test
- •Third-party internals
- •Framework behavior
- •Private implementation
- •Trivial getters/setters
TDD Cycle
Red → Green → Refactor
Synapses
See synapses.json for connections.