By name: test-runner description: Write and run tests across languages — scaffolding, execution, and coverage. Use when the user mentions tests, testing, coverage, TDD, or wants to verify code correctness. version: "1.0.0" license: MIT compatibility: Requires language-specific test framework (jest, pytest, go test, etc.) metadata: author: hermeshub hermes: tags: [testing, jest, pytest, unit-tests, coverage, tdd] category: development requires_tools: [terminal]
Test Runner
Multi-language test scaffolding, execution, and analysis.
When to Use
- User wants to write tests for existing code
- User asks to run a test suite
- User wants coverage analysis
- User practices TDD and needs test scaffolding
Procedure
- Detect language and testing framework
- Analyze the code under test
- Generate test cases covering:
- Happy path (expected behavior)
- Edge cases (empty input, null, boundaries)
- Error cases (invalid input, exceptions)
- Run the test suite
- Report results and coverage
Supported Frameworks
| Language | Framework | Run Command |
|---|---|---|
| JavaScript/TS | Jest | npx jest |
| Python | Pytest | python -m pytest |
| Go | go test | go test ./... |
| Rust | cargo test | cargo test |
Test Patterns
- Arrange-Act-Assert for unit tests
- Given-When-Then for behavior tests
- Table-driven tests for parameterized cases
- Mock external dependencies
Pitfalls
- Don't test implementation details, test behavior
- Mock external services, don't hit real APIs
- Clean up test fixtures after each test
- Watch for flaky tests (timing, ordering)
Verification
- All tests pass
- Coverage meets threshold (aim for 80%+)
- No flaky tests on repeated runs