testing

# Testing Write tests that protect behavior our callers rely on, without depending on implementation details or external services. ## Contents - [Workflow](#workflow) - [Philosophy](references/philosophy.md): what to test and where to draw boundaries - [Authoring](references/authoring.md): file organization, `test`, `expect`, and running tests - [Isolation](references/isolation.md): in-memory dependencies, injection, and integration tests ## Workflow - First ask [is this worth testing?](references/philosophy.md#is-this-worth-testing). Identify a meaningful contract and a plausible regression before adding tests. - Read the relevant references; existing tests are examples, not rules to copy. - Use real logic with in-memory dependencies wherever possible. - Run the focused tests and confirm they fail when the intended behavior breaks. This skill covers repository tests. For grading agent-generated work in a scenario, use the [checks reference](../../../skills/agent-eval/references/checks.md).