Individual skill

assertion-quality

Analyze assertion quality, depth, variety, and false confidence in existing tests. ALWAYS USE when asked about weak, shallow, trivial, always-true, self-referential, assertion-free, presence/truthiness-only, or insufficiently diverse assertions, including MSTest, Jest, pytest, and Go. DO NOT USE for direct fixes: writing-mstest-tests owns supplied MSTest assertions; code-testing owns new cases. Use test-gap-analysis when asked whether tests would catch a production change, and test-anti-patterns for general severity-ranked audits.

plugins/dotnet-test/skills/assertion-quality/SKILL.md

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# Assertion Diversity Analysis

Analyze test code in any supported language to measure how varied and meaningful the assertions are. Produce a metrics report that reveals whether tests verify different facets of correctness — not just "output equals X" but also structure, exceptions, state transitions, side effects, and invariants.

> **Language-specific guidance**: Read the caller-provided or runtime-listed
> `test-analysis-extensions` catalog, then its matching language file
> (`dotnet.md`, `python.md`, `typescript.md`, `go.md`, etc.).
> `test-analysis-extensions` is reference-only; do not invoke it as a skill.
> If the bundle is absent, use the pinned framework and this skill's rules,
> report the missing reference, and do not search installation directories.

## Why Assertion Diversity Matters

Low assertion diversity signals shallow testing. Tests may pass while bugs hide in unasserted logic. Common symptoms: