dev-test (Skill)

A development skill that writes or runs tests using Vitest.

Note: This is a skill, not a slash command. Claude automatically selects and uses it based on the work context.

Overview

The dev-test skill analyzes target files to generate test cases and check coverage.

Trigger Conditions

Claude automatically uses this skill when receiving requests like:

• "Write tests", "run tests", "coverage"
• "vitest", "run tests"

Test Generation Example

User: Write tests for src/auth/login.ts

Claude: Test analysis: src/auth/login.ts

## Functions Found
- login(email, password)
- validateCredentials(email, password)
- createSession(user)

## Tests to Generate

### login
```typescript
describe('login', () => {
  it('returns session with valid credentials', async () => {
    const result = await login('user@test.com', 'pass123');
    expect(result.success).toBe(true);
  });

  it('returns error with wrong password', async () => {
    const result = await login('user@test.com', 'wrong');
    expect(result.success).toBe(false);
  });
});

Create test file? -> tests/auth/login.test.ts

## Test Execution Example

User: Run the tests

Claude: Running tests...

✓ tests/auth/login.test.ts (5 tests) ✓ tests/core/validation.test.ts (12 tests) ✗ tests/payment/checkout.test.ts (3 tests)

• ✗ Payment amount calculation

Result: 19/20 passed (95%)

Failed test: tests/payment/checkout.test.ts:45 Expected: 10000 Received: 9900

Fix needed.

## Coverage Example

User: Check coverage

Claude: Test Coverage

File	Lines	Branches	Functions
src/auth/login.ts	95%	80%	100%
src/core/validation.ts	100%	100%	100%
src/payment/checkout.ts	72%	60%	85%

Overall coverage: 89%

Insufficient coverage:

• src/payment/checkout.ts:50-65 (error handling)

## Related Skills

- [`dev-implement`](/commands/dev-implement) - Spec implementation
- [`dev-review`](/commands/dev-review) - Code review