vitest-testing

Vitest provides fast unit and integration testing for TypeScript/JavaScript with native ESM support and Vite-powered HMR. Install Vitest, configure your test environment and include patterns, write tests using Vitest's utilities, and run with coverage thresholds to validate code quality.

Vitest includes rich mocking capabilities for unit tests, supporting module mocks and assertions. Configure mocking directly in your test files and use Vitest's built-in mock utilities to isolate dependencies and validate behavior.

Vitest offers configurable options for test environment, include patterns, reporters, and coverage thresholds. Set these in your Vitest config file to match your project structure and reporting needs, then run tests with `vitest` to get fast feedback on code changes.

Vitest supports both TypeScript and JavaScript projects with full ESM compatibility. It integrates with Vite-based projects and works alongside your existing build tooling without requiring additional configuration for language support.

Vitest supports configurable coverage thresholds to enforce code quality standards. Set coverage targets in your Vitest configuration, run tests with coverage reporting enabled, and Vitest will generate reports and validate against your defined thresholds.