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assertion-synthesizer
Generate test assertions from existing code implementation. Use when the user has implementation code without tests or incomplete test coverage, and needs assertions synthesized by analyzing the code's behavior, inputs, outputs, and state changes. Supports Python (pytest/unittest), Java (JUnit/AssertJ), and JavaScript/TypeScript (Jest/Chai). Handles equality checks, collections, exceptions, and state verification.
Why this score
This repo hosts 10 skills, so its 256 stars are split between them (about 26 each) for scoring.
Popularity score: 57/100 from public GitHub signals only. It shows how widely used and maintained this is, not how well it works. Not included yet: the fake-star check. The security scan is shown separately and doesn't change the score. How we rank
Security
Scanned Oct 20, 2026 at commit 4f38503747e0, with Cisco's open-source skill-scanner.
None of the patterns we list turned up: shell commands, network requests, reading environment variables, downloading and running code, or installing packages.
A scan lists patterns in the code. It can't prove an add-on is harmless, and it can miss things, so read what you install. How we scan
Alternatives
Other makers' add-ons that do the same job, next to this one.
| Name | Score | Stars | Context | Updated |
|---|---|---|---|---|
| This oneassertion-synthesizer ArabelaTso/Skills-4-SE · Skill | 57 | ★ 256 | ≈110 always | 3mo ago |
| plan-synthesizer testdouble/han · Subagent Both about synthesizer and input | 58 | ★ 318 | ≈34 in chat | 19d ago |
| synthesizer luongnv89/skills · Subagent Both about synthesizer | 57 | ★ 133 | ≈27 in chat | 16d ago |
| trend-synthesizer revfactory/webtoon-harness · Subagent Both about synthesizer | 51 | ★ 328 | ≈51 in chat | 4mo ago |
| ap-synthesizer Spielewoy/autoprompt-skill · Subagent Both about synthesizer | 58 | ★ 1.2k | ≈29 in chat | 1mo ago |
| ci-pipeline-synthesizer kajisho5/ffmpeg-skill · Skill Both about synthesizer and python | 71 | ★ 2.0k | ≈114 always | 18d ago |