5 docs tagged with "vitest"

Why testing matters, the testing pyramid, cost of bugs, coverage as a metric, and a tooling overview for JavaScript/TypeScript and Java projects.

jest.fn(), jest.spyOn(), jest.mock() for modules, clearing and resetting mocks, mocking fetch and axios, and testing async code.

End-to-end exercise — build and test a small TypeScript utility library with Vitest (unit and integration tests), full coverage report, and GitHub Actions CI.

React Testing Library setup, render/screen/fireEvent/userEvent, querying by role and text, testing forms, and testing components that fetch async data.

Setting up Jest and Vitest, writing describe/it/test blocks, using expect matchers, lifecycle hooks, and running your test suite.