docs(10_Wiki): Topic_Business/General/Graphic/Programming을 Topics/ 하위로 이동
최상위 10_Wiki/Topic_*였던 4개 카테고리 폴더를 10_Wiki/Topics/Topic_* 로 재배치. 콘텐츠 변경 없음(순수 폴더 이동) — Topics/ 하위 나머지 폴더는 이미 지난 커밋에서 전부 정리된 상태(잔존 항목은 에이전트 운영 상태 및 사용자가 보존을 요청한 업데이트0615/무제 3.canvas 뿐).
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Antigravity Agent
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---
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id: wiki-2026-0508-quality-control
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title: Quality Control
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category: 10_Wiki/Topics
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status: verified
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canonical_id: self
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aliases: [QC, Software Quality]
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duplicate_of: none
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source_trust_level: A
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confidence_score: 0.9
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verification_status: applied
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tags: [quality, testing, process]
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raw_sources: []
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last_reinforced: 2026-05-10
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github_commit: pending
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tech_stack:
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language: TypeScript/Python
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framework: Playwright/pytest
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---
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# Quality Control
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## 매 한 줄
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> **"매 quality 의 inspect 보다 build-in"**. 매 modern QC 의 shift-left — 매 unit test, type checking, static analysis, contract test, e2e — 매 layer 의 different bug class catch. 2026 의 LLM-augmented test generation + property-based testing 의 mainstream.
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## 매 핵심
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### 매 Test pyramid (2026 update)
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- **Unit (60-70%)**: pure function, fast, isolated.
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- **Integration (15-25%)**: module + DB/queue, real dependencies via testcontainers.
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- **E2E (5-10%)**: full user journey, Playwright/Cypress.
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- **Contract (5%)**: Pact, consumer-driven, prevent break-on-deploy.
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- **Property-based (cross-cutting)**: Hypothesis/fast-check, find edge cases.
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### 매 Quality gates
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- 매 PR 의 merge 전: lint, type, unit test, coverage threshold, security scan.
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- 매 deploy 전: integration test, smoke test, canary metrics.
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- 매 prod: synthetic monitoring, real-user monitoring (RUM).
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### 매 Defect classes
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- **Functional**: wrong output for given input.
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- **Performance**: slow, regression on benchmark.
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- **Security**: OWASP categories.
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- **Accessibility**: WCAG violations.
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- **Compatibility**: browser/OS specific.
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### 매 응용
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1. CI/CD pipeline gates.
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2. Pre-merge bots (Danger, Reviewdog).
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3. Mutation testing (Stryker) — quality of tests themselves.
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4. Visual regression (Chromatic, Percy).
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5. Chaos engineering (production resilience).
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## 💻 패턴
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### Property-based testing (TypeScript with fast-check)
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```typescript
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import fc from 'fast-check';
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import { reverse } from './lib';
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test('reverse twice = identity', () => {
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fc.assert(
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fc.property(fc.array(fc.integer()), (arr) => {
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expect(reverse(reverse(arr))).toEqual(arr);
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}),
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);
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});
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```
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### Contract test (Pact)
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```typescript
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// Consumer side
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const provider = new Pact({ consumer: 'Web', provider: 'OrdersAPI' });
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await provider.addInteraction({
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state: 'order 123 exists',
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uponReceiving: 'a request for order 123',
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withRequest: { method: 'GET', path: '/orders/123' },
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willRespondWith: {
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status: 200,
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body: { id: '123', total: 99.0 },
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},
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});
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// Generates pact.json — provider verifies against it in CI
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```
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### Mutation testing (Stryker)
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```javascript
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// stryker.conf.js
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export default {
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testRunner: 'vitest',
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mutate: ['src/**/*.ts'],
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thresholds: { high: 80, low: 60, break: 50 },
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};
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// Mutates code (a + b → a - b) and checks if tests catch it
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// Surviving mutants = weak tests
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```
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### LLM-assisted test generation (2026 pattern)
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```typescript
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// CI step: claude-code generates edge cases
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// $ claude test-gen src/parser.ts --output tests/parser.gen.test.ts
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// Then human review before merge — never blind-trust
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```
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### Visual regression (Playwright)
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```typescript
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test('homepage matches snapshot', async ({ page }) => {
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await page.goto('/');
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await page.waitForLoadState('networkidle');
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expect(await page.screenshot()).toMatchSnapshot('home.png', {
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maxDiffPixelRatio: 0.01,
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});
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});
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```
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### Coverage gates (vitest)
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```typescript
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// vitest.config.ts
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export default {
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test: {
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coverage: {
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provider: 'v8',
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thresholds: {
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lines: 80,
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functions: 80,
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branches: 75,
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statements: 80,
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},
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},
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},
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};
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```
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### Pre-commit hook (lint-staged + husky)
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```json
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{
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"lint-staged": {
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"*.{ts,tsx}": [
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"eslint --fix",
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"prettier --write",
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"vitest related --run"
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]
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}
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}
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```
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### Chaos test (Toxiproxy / Litmus)
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```yaml
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# Inject 500ms latency into Redis dependency
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apiVersion: chaos-mesh.org/v1alpha1
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kind: NetworkChaos
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spec:
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action: delay
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selector:
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labelSelectors: { app: redis }
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delay: { latency: 500ms }
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duration: 60s
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```
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## 매 결정 기준
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| 상황 | Approach |
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|---|---|
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| Pure logic | Unit + property-based |
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| Multi-service flow | Integration + contract |
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| User journey | E2E (sparingly) |
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| Performance regression | Benchmark in CI |
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| Visual UI | Snapshot + Chromatic |
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| Test confidence | Mutation score |
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**기본값**: 80% line coverage, mutation score >70%, property-based for parsers/serializers.
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## 🔗 Graph
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- 부모: [[Test_Automation]]
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- 변형: [[CI_CD_Pipeline]] · [[Test_Automation|Test_Automation_Mastery]]
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- 응용: [[Engineering Metrics (DORA)]] · [[Automated Quality & Review]]
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- Adjacent: [[Continuous Integration (CI)|Continuous_Integration]] · [[Husky]]
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## 🤖 LLM 활용
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**언제**: generate edge cases, suggest mutation-resistant assertions, identify untested branches.
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**언제 X**: never let LLM write the assertion AND implementation — confirmation bias.
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## ❌ 안티패턴
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- **Coverage worship**: 100% coverage, 0% assertions ("test executes but checks nothing").
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- **Flaky tests ignored**: erodes trust in suite. Quarantine and fix immediately.
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- **E2E-heavy pyramid**: slow, flaky, expensive. Push down to integration/unit.
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- **Manual QA only**: doesn't scale, regression-prone.
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- **No mutation testing**: blind to assertion quality.
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## 🧪 검증 / 중복
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- Verified (Google Testing Blog, Mike Cohn pyramid, Stryker docs).
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- 신뢰도 A.
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## 🕓 Changelog
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| 날짜 | 변경 |
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| 2026-05-08 | Phase 1 |
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| 2026-05-10 | Manual cleanup — pyramid + 2026 LLM-assisted patterns |
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