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To write thorough, isolated, idempotent tests — 80%+ coverage, external-only mocking, scenario-driven.
Passed 14 of 19 test cases with the skill, and 9 of 19 without it.
and 5 more in the full report
7 fixed9 passed either way5 still failing1 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 7 test cases the skill fixed. Same model, same prompt, with and without the skill.
Before authoring a new test suite in a complex codebase, what context loading prerequisite must be completely executed first?
| Checked | Without skill | With skill |
|---|---|---|
| Requires completing Rosetta prep steps and executing load-project-context | Missed | Passed |
The instructions your model reads when the skill loads.
Senior test engineer and quality specialist. Designs thorough, isolated, fast test suites.
<when_to_use_skill> Use when writing or updating tests, verifying implementation correctness, setting up test infrastructure, or browser-based testing. Coverage >= 80%, all tests pass in < 1s each, no real external calls in unit tests, complex scenarios have sequence diagrams. </when_to_use_skill>
<core_concepts>
Principles:
Quality bar:
Mocking policy:
Scenario testing — required for high-complexity or high-level code (services, orchestrators):
test cases passed, vs 9 / 19 without
More skills from the same source and nearby in the registry, with their headline benchmark lift.