Correct async assertions, mocking, snapshots, and CI configuration in Vitest test suites.
npx skills add https://github.com/selfagency/agentsy --skill vitest-selfagency
Please help me install this Agent Skill. Skill: vitest Source: https://github.com/selfagency/agentsy/tree/main/.agents/skills/vitest Command: npx skills add https://github.com/selfagency/agentsy --skill vitest-selfagency
It eliminates flaky or misleading Vitest results caused by incorrect async handling, leaking mocks/state across tests, unstable snapshots, and slow CI performance patterns.
Use the vitest skill to rewrite your failing or flaky test by applying the relevant rule from the async patterns or test setup categories, then re-run the test suite to confirm it becomes deterministic.
High-intent search queries and answers about installing and using this skill.
Flaky Vitest tests often stem from incorrect async handling, such as not returning promises or missing vi.waitFor conditions. Applying proper async assertion patterns and fake timers makes time-dependent logic deterministic and test results reliable.
To stop mock state leaking across Vitest tests, clean up shared mutable state in afterEach hooks and restore mocks after each test. Resetting module cache when needed and choosing vi.spyOn versus vi.mock appropriately ensures strict test isolation.
Migrating from Jest to Vitest requires updating vi.* helpers and ensuring stable snapshot serialization. Keeping snapshots reviewable and correctly configuring execution environments prevents silent regressions and maintains consistent test behavior.
Configuring Vitest pools and environments directly improves CI performance. Optimizing execution through run mode, bail, and sharding configurations significantly reduces overall test runtime while maintaining reliable test outcomes.
Use fake timers in Vitest when testing time-dependent logic to make assertions deterministic. vi.useFakeTimers controls time progression, preventing race conditions and ensuring async operations settle predictably without arbitrary delays.
anderskevConfigure Vitest projects with unit and integration tests using mocking and snapshots.
lorenzogmGenerate CI/CD configurations for GitHub Actions, GitLab CI, Azure DevOps, and Harness.
hieutrtrStandardize React component and hook tests with Testing Library, Vitest, and MSW.
botPhUConfigure and optimize Vitest for Vite-based projects, including Jest migration.
