testing-expert

To fix flaky tests, you need proper async awaiting, timer control, and deterministic test runs. This Skill diagnoses flakiness across Jest, Vitest, and Playwright, delivering a prioritized remediation plan with actionable steps to stabilize unit, integration, and end-to-end tests.

Effective mocking in Vitest and Jest requires appropriate use of spies, stubs, and mocks with clean cleanup patterns. You receive concrete recommendations on mocking strategy to ensure test isolation and maintainability without leaving residual state between test runs.

Optimizing test suite performance in CI involves improving test isolation and coverage meaningfully. You get specific guidance on CI performance improvements and deterministic workflows, ensuring fast, reliable test execution across your JavaScript and TypeScript projects.

Yes, this testing guidance applies to unit, integration, and end-to-end tests in JavaScript and TypeScript projects. It helps design clear test boundaries and reusable utilities to reduce duplication, ensuring reliable practices across your entire test suite.

Intermittent Playwright e2e test failures usually stem from improper awaiting, timing issues, or non-deterministic test runs. This Skill identifies unreliable testing practices and provides async best practices and concrete steps to eliminate flakiness with minimal disruption.