test-runner

Test Runner

Expert skill for test execution and failure diagnosis.

Quick Start

Test Checklist:
- [ ] Environment configured
- [ ] Tests run or failures captured
- [ ] Failed tests diagnosed
- [ ] Coverage report generated

When to Use

• Running test suites
• Debugging failing tests
• Setting up CI/CD pipelines
• Analyzing test coverage
• Identifying flaky tests

Framework Commands

JavaScript

jest                    # Run all
jest path/to/test.ts    # Specific file
jest --coverage       # With coverage
jest --watch          # Watch mode

Python

pytest                  # Run all
pytest tests/test.py    # Specific file
pytest --cov=src        # With coverage
pytest -v              # Verbose

Rust

cargo test              # Run all
cargo test test_name    # Specific test
cargo test -- --nocapture  # Show output

Go

go test ./...           # Run all
go test -v ./...        # Verbose
go test -cover ./...    # With coverage

Bash

bats tests/             # Run all
bats tests/file.bats    # Specific file

Diagnosing Failures

Step 1: Identify Error Type

Pattern	Likely Cause	Action
AssertionError: expected X got Y	Logic error	Check implementation
TimeoutError	Async issue	Check async/await
ModuleNotFoundError	Missing dep	Install dependency
panic: runtime error	Go panic	Check nil/bounds

Step 2: Isolate Test

pytest test.py::test_func -v     # Python
jest --testNamePattern="test"     # Jest
cargo test test_name               # Rust

Step 3: Check Environment

pip list | grep pytest            # Python
npm list jest                      # Node
# ./scripts/setup-test-db.sh       # Test data (create if needed for project)

Coverage Analysis

Generate Reports

# Jest
jest --coverage --coverageReporters=text-summary

# Python
pytest --cov=src --cov-report=html

# Rust
cargo tarpaulin --out Html

# Go
go test -coverprofile=coverage.out ./...
go tool cover -html=coverage.out