nw-property-based-testing SKILL.md skillA
nw-property-based-testing from nwave-ai/nwave is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add nwave-ai/nwave/nw-property-based-testing@git:20260609.c723548Pins git:20260609.c723548 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- nwave-ai/nwave
- Path
nWave/skills/nw-property-based-testing/SKILL.md- Versions recorded
- 5
- Latest version
- git:20260609.c723548, committed Jun 9, 2026
- First version recorded
- Mar 17, 2026
- Size
- 7,360 bytes
- Repository stars
- 633
- License
- MIT
Property-based testing strategies, mutation testing, shrinking, and combined PBT+mutation workflow for test quality validation.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Property-Based Testing and Mutation Testing
> Deferred to Phase 2.25: Mutation testing runs ONCE per feature as final quality gate at orchestrator Phase 2.25 (after all steps complete). Do NOT run mutation testing during inner TDD loop.
## Property-Based Testing (PBT)
Instead of examples ("given X, expect Y"), write properties ("for all valid inputs, condition Z holds").
Framework generates hundreds/thousands of inputs checking property. Dramatically expands test coverage.
## Property Patterns
1. **Invariants**: "for all inputs, condition holds" (sorted list is ordered, balance >= 0)
2. **Roundtrip**: "encode then decode = original" (serialize/deserialize, compress/decompress)
3. **Oracle**: "compare against reference implementation" (optimized vs correct-but-slow)
4. **Metamorphic**: "different operations, same result" (add(a,b)==add(b,a), filter can't increase size)
## Shrinking
When property fails, framework auto-finds minimal failing input. Dramatically accelerates debugging.
Algorithm: find failing input -> try simpler variants -> if still fails, use as new candidate -> repeat.
## PBT Tools by Language
| Language | Framework |
|----------|-----------|
…Read the whole file at its exact version.
How to install
mdr add nwave-ai/nwave/nw-property-based-testing@sha256:f83ab800c7bf9753The line at the top of this page pins the label git:20260609.c723548, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_titmygolppttq2fp)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 5 versions of this file, between Mar 17, 2026 and Jun 9, 2026, about one every 21 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260609.c723548 latest | 2026-06-09 | c723548 | 7,360 B | A | view · diff |
| git:20260515.650a105 | 2026-05-15 | 650a105 | 5,959 B | A | view · diff |
| git:20260320.d98f3cb | 2026-03-20 | d98f3cb | 3,718 B | A | view · diff |
| git:20260318.e6a0e19 | 2026-03-18 | e6a0e19 | 3,696 B | A | view · diff |
| git:20260317.1d16147 | 2026-03-17 | 1d16147 | 3,687 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (7360 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
nwave-ai/nwave · 633 stars · license MIT · pushed 2026-11-07 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_titmygolppttq2fp GET https://markdownregistry.com/api/v1/resolve?ref=nwave-ai/nwave/nw-property-based-testing GET https://markdownregistry.com/api/v1/blob/f83ab800c7bf9753841f0119fb23c062bed6d37a44354d1c334637503541836f
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.