Test File Conventions When to Apply This Skill Use this pattern when you need to: - Write or refactor files in this codebase. - Structure tests with functions instead of mutable setup. - Split large test files into focused behavior/type/scenario files. - Enforce behavior-based test naming and clear failure intent. - Add or review negative type tests using . - Audit a test file for assertions that cannot fail or fakes that don't earn their lines. - Prune tests that cannot name a real regression they would catch. References Load these on demand based on what you're working on: - If working with…