# Test Runner

> test-runner

- Skill: `ondrej-merkun/test-runner` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add ondrej-merkun/test-runner`
- Raw SKILL.md: https://api.skillmd.com/api/skills/ondrej-merkun/test-runner/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: ondrej-merkun (https://skillmd.com/u/ondrej-merkun)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/ondrej-merkun/test-runner

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# test-runner

Runs the project test suite and summarises results: pass/fail counts,
slowest tests, and coverage delta since the last run.

<test-runner>
Use this skill to run tests and interpret results.

Commands:
- `run [pattern]` — run all tests, or only tests matching pattern
- `watch` — re-run affected tests on file change
- `coverage` — run with coverage and print a branch summary
- `slowest [n]` — list the n slowest tests (default 10)
- `diff` — compare pass/fail counts to the last saved baseline

Autodetects: `pytest` (Python), `vitest` / `jest` (JS/TS), `cargo test` (Rust).
Results saved to `.test-baseline.json` in the project root.
</test-runner>