# property-based-testing

Skill · `skill:property-based-testing`

Favz census, built 2026-10-05. Tool names and counts only. No repo names. HTML page: https://favz.co/tools/skill-property-based-testing.html

- Repos that have it now: 25
- Repos that ever had it: 27
- Still have it: 93%
- Share of census repos with any tool: 0.02%

## Repos with it, by month

From commit dates in each repo's history. The last few days always look low, because repos found later fill them in.

| Month | Repos at month end |
|---|---|
| 2025-12 | 1 |
| 2026-02 | 3 |
| 2026-03 | 8 |
| 2026-04 | 10 |
| 2026-05 | 13 |
| 2026-06 | 17 |
| 2026-07 | 20 |
| 2026-08 | 22 |
| 2026-09 | 24 |
| 2026-10 | 25 |

## Goes with

Tools found in the same repos, ranked by lift: 3× means the two show up together three times as often as chance would give. Only pairs sharing 5 or more repos.

| Tool | Kind | Repos with both | Lift |
|---|---|---|---|
| [semgrep-rule-creator](https://favz.co/tools/skill-semgrep-rule-creator.md) | Skill | 11 | 2308.5× |
| [sharp-edges](https://favz.co/tools/skill-sharp-edges.md) | Skill | 13 | 2143.6× |
| [devcontainer-setup](https://favz.co/tools/skill-devcontainer-setup.md) | Skill | 9 | 2077.6× |
| [audit-context-building](https://favz.co/tools/skill-audit-context-building.md) | Skill | 11 | 1953.3× |
| [agentic-actions-auditor](https://favz.co/tools/skill-agentic-actions-auditor.md) | Skill | 8 | 1846.8× |
| [variant-analysis](https://favz.co/tools/skill-variant-analysis.md) | Skill | 10 | 1775.7× |
| [ask-questions-if-underspecified](https://favz.co/tools/skill-ask-questions-if-underspecified.md) | Skill | 10 | 1710.0× |
| [differential-review](https://favz.co/tools/skill-differential-review.md) | Skill | 12 | 1678.9× |
| [second-opinion](https://favz.co/tools/skill-second-opinion.md) | Skill | 9 | 1598.2× |
| [mutation-testing](https://favz.co/tools/skill-mutation-testing.md) | Skill | 12 | 1007.3× |
| [gh-cli](https://favz.co/tools/skill-gh-cli.md) | Skill | 7 | 923.4× |
| [skill-improver](https://favz.co/tools/skill-skill-improver.md) | Skill | 6 | 923.4× |