testing-debugging
Write tests, debug failures, and implement quality strategies across unit, integration, and E2E layers.
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- glayph/Agent
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- 2026년 9월 19일 22:39
- 감지된 SKILL.md 언어
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SKILL.md
소스 지침 · 읽기 전용 미리보기- name
- testing-debugging
- description
- Write tests, debug failures, and implement quality strategies across unit, integration, and E2E layers.
- version
- 1.0.0
- author
- Miki
- license
- MIT
- platforms
- ["linux","macos","windows"]
- metadata
- {"Miki":{"tags":["testing","debugging","qa","tdd","quality"],"related_skills":["javascript","frontend-frameworks"]}}
# Testing & Debugging
## Test pyramid
```
E2E (10%) — Playwright, Cypress
Integration (20%) — supertest, Testing Library
Unit (70%) — Vitest, Jest
```
## TDD cycle
1. Write failing test (red)
2. Write minimal code to pass (green)
3. Refactor (clean)
4. Repeat
## Unit testing patterns
```ts
describe("calculateTotal", () => {
it("sums item prices with tax", () => {
expect(calculateTotal([{ price: 10 }, { price: 20 }], 0.1))
.toBe(33); // (10+20) * 1.1
});
it("handles empty cart", () => {
expect(calculateTotal([], 0.1)).toBe(0);
});
it("throws on negative tax", () => {
expect(() => calculateTotal([], -1)).toThrow("invalid tax");
});
});
```
## Debugging protocol
1. **Reproduce**: exact steps, input, environment
2. **Isolate**: binary search (comment half, test, repeat)
3. **Read errors**: first line of stack trace = where it broke
4. **Check assumptions**: verify input types, null checks, async order
5. **Check logs**: structured logger > console.log
6. **Fix + add test**: prove fix works, prevent regression
## Common bug patterns
| Symptom | Likely cause |
|---------|-------------|
| "undefined is not a function" | Import failure / wrong this binding |
| Infinite loop | Missing base case in recursion / useEffect deps |
| Stale state | Closure over old value / missing deps array |
| Off-by-one | `<` vs `<=`, index vs length |
| Silent fail | Uncaught async error / empty catch block |
## Debugging tools
- `node --inspect` + Chrome DevTools
- VS Code: breakpoints, watch, call stack
- `console.table()`, `console.trace()`, `console.time()`
- Network tab: request/response, timing, cookies
- React DevTools: component tree, state, props, profiler
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