Run JavaScript/TypeScript unit and integration tests with Vitest, including mocked external dependencies and React hooks/API checks.
npx skills add https://github.com/fcalell/dotfiles --skill vitest-fcalell
Please help me install this Agent Skill. Skill: vitest Source: https://github.com/fcalell/dotfiles/tree/main/dot_claude/skills/vitest Command: npx skills add https://github.com/fcalell/dotfiles --skill vitest-fcalell
Writing robust tests for functions, API handlers, and React hooks can be verbose and brittle; Vitest provides fast, modern testing for JavaScript/TypeScript projects to keep code reliable.
Install Vitest in your project and run tests to verify unit and integration logic.
High-intent search queries and answers about installing and using this skill.
Unit tests for TypeScript functions using Vitest are written as co-located files next to source code, such as placing calculate.test.ts directly beside calculate.ts, to verify logic quickly and reliably.
Testing React hooks with Vitest is fully supported by utilizing lightweight utilities like testing-library alongside Vitest-compatible async patterns to validate hook behavior and state changes.
The best way to mock external dependencies for integration tests in Vitest is by configuring mock environments within the test runner to isolate API handlers and produce snapshot-friendly outputs.
Vitest requires a project structure that places tests next to source files, meaning your test files should sit directly alongside the modules they verify within your TypeScript project directories.
API handler tests with Vitest work by mocking external dependencies within integration test patterns to validate request processing and response logic across your TypeScript project endpoints.
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