What problem does it solve? React test suites can pass while proving little: render-only smoke tests, snapshot-only coverage, over-mocked integrations, and assertions on mock calls instead of user-visible results let real regressions ship. This Skill reviews tests against the standard of whether they would fail when user-visible behavior breaks. ## Core Features & Use Cases - Behavioral Coverage Review: Evaluates Testing Library, Vitest/Jest, Storybook play, and Playwright component tests against the user-visible contract they claim to protect, with severity based on surviving regressions rather than checklist patterns. - Anti-Pattern Detection: Provides static scan patterns for test IDs, snapshots, fireEvent, mock-call waits, and shallow rendering, each treated as an investigation signal rather than an automatic finding. - Structured Findings Report: Produces findings with evidence, surviving regression, impact-based severity, counterevidence checked, and minimal repair, using the report contract in references/report-format.md. - Use Case: Point the Skill at a pull request adding a delete-confirmation modal test; it identifies that the snapshot and test-ID assertions would still pass if the confirm handler were removed, and supplies a userEvent-based replacement test. ## Quick Start Ask the agent to review the React tests in your current changes for behavioral coverage and report findings with file locations without editing code.
