# Write Failing Test First

> Before fixing any bug, write a test that reproduces it and watch it fail. Use for every bug fix.

- **Type:** Skill
- **Install:** `agentstack add skill-archive228-loopkit-write-failing-test-first`
- **Verified:** Yes — security-reviewed for prompt injection and unsafe behavior
- **Seller:** [Archive228](https://agentstack.voostack.com/s/archive228)
- **Installs:** 0
- **Category:** [Agent Skills](https://agentstack.voostack.com/c/agent-skills)
- **Latest version:** 0.1.0
- **License:** MIT
- **Upstream author:** [Archive228](https://github.com/Archive228)
- **Source:** https://github.com/Archive228/loopkit/tree/main/skills/write-failing-test-first

## Install

```sh
agentstack add skill-archive228-loopkit-write-failing-test-first
```

Requires the [AgentStack CLI](https://agentstack.voostack.com/docs/cli). Works with Claude Code, Cursor, and any MCP-compatible agent.

## About

# Write the Failing Test First
The only proof you fixed a bug is a test that failed before and passes after.
1. Write the smallest test that reproduces the reported behavior.
2. Run it. **Watch it fail** for the right reason (read the assertion, not just red).
3. Now fix the code.
4. Run the test. It passes. Run the FULL suite — you didn't break anything else.
If you can't write the test easily, the architecture is telling you something (tight coupling). Say so.
Never: fix first, test after (you'll write a test that passes regardless). Never: skip the watch-it-fail step.

## Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

- **Author:** [Archive228](https://github.com/Archive228)
- **Source:** [Archive228/loopkit](https://github.com/Archive228/loopkit)
- **License:** MIT

Install and usage instructions live in the source repository linked above.

## Pricing

- **Free** — Free

## Security capabilities

Automated source analysis of v0.1.0 — what this tool can access:

- **Network access:** no
- **Filesystem access:** no
- **Shell / process execution:** no
- **Environment & secrets:** no
- **Dynamic code execution:** no

*"Yes" means the capability is present in the source — more access means more to trust, not that it is unsafe.*


## Versions

- **0.1.0** — security scan: passed — Imported from the upstream source.

## Links

- Listing page: https://agentstack.voostack.com/l/skill-archive228-loopkit-write-failing-test-first
- Seller: https://agentstack.voostack.com/s/archive228
- Browse the marketplace: https://agentstack.voostack.com/browse

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Listed on AgentStack — the marketplace for AI agent skills and MCP servers. Every listing is security-reviewed. Creators keep 70%.