Assertion Quality skill: what it does and how to install it

What it does. Analyses test files or projects by identifying the language and framework, classifying assertions, and calculating per-test and suite-wide metrics. It reports assertion-free, trivial-only, self-referential and single-category tests, then gives calibrated findings and concrete recommendations based on the tested behaviours.

When to use it. Use it to evaluate whether existing tests meaningfully verify values, errors, structure, state and side effects. It does not write or directly fix tests, analyse general test anti-patterns, assess code coverage percentages, or determine whether tests catch a specific production change.