Registry indexed
Designs and implements testing strategies for any codebase. Use when adding tests, improving coverage, setting up testing infrastructure, debugging test failures, or when asked about unit tests, integration tests, or E2E testing.
Designs and implements testing strategies for any codebase. Use when adding tests, improving coverage, setting up testing infrastructure, debugging test failures, or when asked about unit tests, integration tests, or E2E testing.
Source documentation, not instructions for this website. Review permissions before running any commands.
Copy this checklist and track progress:
Test Implementation Progress:
- [ ] Step 1: Identify what to test
- [ ] Step 2: Select appropriate test type
- [ ] Step 3: Write tests following templates
- [ ] Step 4: Run tests and verify passing
- [ ] Step 5: Check coverage meets targets
- [ ] Step 6: Fix any failing tests
Apply the testing pyramid for balanced coverage:
/\
/ \ E2E Tests (10%)
/----\ - Critical user journeys
/ \ - Slow but comprehensive
/--------\ Integration Tests (20%)
/ \ - Component interactions
/------------\ - API contracts
/ \ Unit Tests (70%)
/________________\ - Fast, isolated
- Business logic focus
| Type | Recommended | Alternative |
|---|---|---|
| Unit | Vitest | Jest |
| Integration | Vitest + MSW | Jest + SuperTest |
| E2E | Playwright | Cypress |
| Component | Testing Library | Enzyme |
| Type | Recommended | Alternative |
|---|---|---|
| Unit | pytest | unittest |
| Integration | pytest + httpx | pytest + requests |
| E2E | Playwright | Selenium |
| API | pytest + FastAPI TestClient | - |
| Type | Recommended |
|---|---|
| Unit | testing + testify |
| Integration | testing + httptest |
| E2E | testing + chromedp |
describe("[Unit] ComponentName", () => {
describe("methodName", () => {
it("should [expected behavior] when [condition]", () => {
// Arrange
const input = createTestInput();
// Act
const result = methodName(input);
// Assert
expect(result).toEqual(expectedOutput);
});
it("should throw error when [invalid condition]", () => {
expect(() => methodName(invalidInput)).toThrow(ExpectedError);
});
});
});
describe("[Integration] API /users", () => {
beforeAll(async () => {
await setupTestDatabase();
});
afterAll(async () => {
await teardownTestDatabase();
});
it("should create user and return 201", async () => {
const response = await request(app)
.post("/users")
.send({ name: "Test", email: "test@example.com" });
expect(response.status).toBe(201);
expect(response.body.id).toBeDefined();
});
});
describe("[E2E] User Registration Flow", () => {
it("should complete registration successfully", async ({ page }) => {
await page.goto("/register");
await page.fill('[data-testid="email"]', "new@example.com");
await page.fill('[data-testid="password"]', "SecurePass123!");
await page.click('[data-testid="submit"]');
await expect(page.locator(".welcome-message")).toBeVisible();
await expect(page).toHaveURL("/dashboard");
});
});
{
"coverageThreshold": {
"global": {
"branches": 80,
"functions": 80,
"lines": 80,
"statements": 80
},
"src/core/": {
"branches": 95,
"functions": 95
}
}
}
// factories/user.js
export const userFactory = (overrides = {}) => ({
id: faker.string.uuid(),
name: faker.person.fullName(),
email: faker.internet.email(),
createdAt: new Date(),
...overrides,
});
// Usage
const admin = userFactory({ role: "admin" });
// fixtures/users.json
{
"validUser": { "name": "Test", "email": "test@example.com" },
"invalidUser": { "name": "", "email": "invalid" }
}
// API mocking with MSW
import { http, HttpResponse } from "msw";
export const handlers = [
http.get("/api/users", () => {
return HttpResponse.json([{ id: 1, name: "John" }]);
}),
];
// Time mocking
vi.useFakeTimers();
vi.setSystemTime(new Date("2024-01-01"));
After writing tests, run this validation:
Test Validation:
- [ ] All tests pass: `npm test`
- [ ] Coverage meets thresholds: `npm test -- --coverage`
- [ ] No flaky tests (run multiple times)
- [ ] Tests are independent (order doesn't matter)
- [ ] Test names clearly describe behavior
If any tests fail, fix them before proceeding. If coverage is below target, add more tests for uncovered code paths.
# Run tests
npm test
# Run with coverage
npm test -- --coverage
# Run specific test file
npm test -- path/to/test.spec.ts
# Run in watch mode during development
npm test -- --watch
name: designing-tests description: Designs and implements testing strategies for any codebase. Use when adding tests, improving coverage, setting up testing infrastructure, debugging test failures, or when asked about unit tests, integration tests, or E2E testing.
---
name: designing-tests
description: Designs and implements testing strategies for any codebase. Use when adding tests, improving coverage, setting up testing infrastructure, debugging test failures, or when asked about unit tests, integration tests, or E2E testing.
---
# Designing Tests
### When to Load
- **Trigger**: Adding tests, test strategy planning, improving coverage, setting up testing infrastructure
- **Skip**: Non-test code changes where testing is not part of the task
## Test Implementation Workflow
Copy this checklist and track progress:
```
Test Implementation Progress:
- [ ] Step 1: Identify what to test
- [ ] Step 2: Select appropriate test type
- [ ] Step 3: Write tests following templates
- [ ] Step 4: Run tests and verify passing
- [ ] Step 5: Check coverage meets targets
- [ ] Step 6: Fix any failing tests
```
## Testing Pyramid
Apply the testing pyramid for balanced coverage:
```
/\
/ \ E2E Tests (10%)
/----\ - Critical user journeys
/ \ - Slow but comprehensive
/--------\ Integration Tests (20%)
/ \ - Component interactions
/------------\ - API contracts
/ \ Unit Tests (70%)
/________________\ - Fast, isolated
- Business logic focus
```
## Framework Selection
### JavaScript/TypeScript
| Type | Recommended | Alternative |
| ----------- | --------------- | ---------------- |
| Unit | Vitest | Jest |
| Integration | Vitest + MSW | Jest + SuperTest |
| E2E | Playwright | Cypress |
| Component | Testing Library | Enzyme |
### Python
| Type | Recommended | Alternative |
| ----------- | --------------------------- | ----------------- |
| Unit | pytest | unittest |
| Integration | pytest + httpx | pytest + requests |
| E2E | Playwright | Selenium |
| API | pytest + FastAPI TestClient | - |
### Go
| Type | Recommended |
| ----------- | ------------------ |
| Unit | testing + testify |
| Integration | testing + httptest |
| E2E | testing + chromedp |
## Test Structure Templates
### Unit Test
```javascript
describe("[Unit] ComponentName", () => {
describe("methodName", () => {
it("should [expected behavior] when [condition]", () => {
// Arrange
const input = createTestInput();
// Act
const result = methodName(input);
// Assert
expect(result).toEqual(expectedOutput);
});
it("should throw error when [invalid condition]", () => {
expect(() => methodName(invalidInput)).toThrow(ExpectedError);
});
});
});
```
### Integration Test
```javascript
describe("[Integration] API /users", () => {
beforeAll(async () => {
await setupTestDatabase();
});
afterAll(async () => {
await teardownTestDatabase();
});
it("should create user and return 201", async () => {
const response = await request(app)
.post("/users")
.send({ name: "Test", email: "test@example.com" });
expect(response.status).toBe(201);
expect(response.body.id).toBeDefined();
});
});
```
### E2E Test
```javascript
describe("[E2E] User Registration Flow", () => {
it("should complete registration successfully", async ({ page }) => {
await page.goto("/register");
await page.fill('[data-testid="email"]', "new@example.com");
await page.fill('[data-testid="password"]', "SecurePass123!");
await page.click('[data-testid="submit"]');
await expect(page.locator(".welcome-message")).toBeVisible();
await expect(page).toHaveURL("/dashboard");
});
});
```
## Coverage Strategy
### What to Cover
- ✅ Business logic (100%)
- ✅ Edge cases and error handling (90%+)
- ✅ API contracts (100%)
- ✅ Critical user paths (E2E)
- ⚠️ UI components (snapshot + interaction)
- ❌ Third-party library internals
- ❌ Simple getters/setters
### Coverage Thresholds
```json
{
"coverageThreshold": {
"global": {
"branches": 80,
"functions": 80,
"lines": 80,
"statements": 80
},
"src/core/": {
"branches": 95,
"functions": 95
}
}
}
```
## Test Data Management
### Factories/Builders
```javascript
// factories/user.js
export const userFactory = (overrides = {}) => ({
id: faker.string.uuid(),
name: faker.person.fullName(),
email: faker.internet.email(),
createdAt: new Date(),
...overrides,
});
// Usage
const admin = userFactory({ role: "admin" });
```
### Fixtures
```javascript
// fixtures/users.json
{
"validUser": { "name": "Test", "email": "test@example.com" },
"invalidUser": { "name": "", "email": "invalid" }
}
```
## Mocking Strategy
### When to Mock
- ✅ External APIs and services
- ✅ Database in unit tests
- ✅ Time/Date for determinism
- ✅ Random values
- ❌ Internal modules (usually)
- ❌ The code under test
### Mock Examples
```javascript
// API mocking with MSW
import { http, HttpResponse } from "msw";
export const handlers = [
http.get("/api/users", () => {
return HttpResponse.json([{ id: 1, name: "John" }]);
}),
];
// Time mocking
vi.useFakeTimers();
vi.setSystemTime(new Date("2024-01-01"));
```
## Test Validation Loop
After writing tests, run this validation:
```
Test Validation:
- [ ] All tests pass: `npm test`
- [ ] Coverage meets thresholds: `npm test -- --coverage`
- [ ] No flaky tests (run multiple times)
- [ ] Tests are independent (order doesn't matter)
- [ ] Test names clearly describe behavior
```
If any tests fail, fix them before proceeding. If coverage is below target, add more tests for uncovered code paths.
```bash
# Run tests
npm test
# Run with coverage
npm test -- --coverage
# Run specific test file
npm test -- path/to/test.spec.ts
# Run in watch mode during development
npm test -- --watch
```
Skill source recorded
Skill instructions are recorded. This is not a runtime test, safety guarantee or compatibility certification.
Review before install: Avoid automatic install
License: MIT
Listed tools are metadata hints, not tested compatibility. Agent prompts are suggested handoffs.
Check the source for dependencies, API keys and third-party costs. A public repository does not mean every service is free.
Repository metadata and review signals are advisory. Popularity, source discovery and successful execution are different facts.
Version reported in registry metadata; check source releases before relying on it.
Quality
78/100
Strong
Trust
68/100
This page exposes the same decision, trust, audit, use-case, and install signals through the Registry API, so agents can rank this skill without scraping the UI.
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"documentation": "Strong README/SKILL.md context",
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Audit
81/100
Needs review
Copies are not installs. Installation counts require a reported successful installation; they are not a blanket quality guarantee.