javascript-testing

To set up JavaScript testing with Vitest or Jest for TypeScript, you configure the test runner with TypeScript support and use utility test helpers. This skill automates that configuration for Vite-based and standard JS projects.

Yes, component testing in SvelteKit, React, and Vue is fully supported. The workflow provides standardized examples and test helpers to validate components using mocks, spies, and coverage reporting.

The best way to standardize mocks and spies is to use shared utility test helpers. This approach applies consistent mocking patterns to improve reliability and maintainability across Vitest or Jest environments.

Vitest is designed for Vite-based projects, so installing it in a Vite environment is the recommended quick start path. However, Jest is also supported as an alternative for standard JavaScript and TypeScript testing workflows.

Generating coverage reports when testing TypeScript code involves enabling the coverage reporting feature in your Vitest or Jest configuration. This workflow supports coverage reporting to help track and validate code execution across your tests.

Component tests may fail to apply mocks correctly if the test configuration lacks proper TypeScript support or utility test helpers. Standardizing your mocks and spies through the configured test environment ensures reliable execution.