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A complete roadmap for Vitest, the Vite-native test runner with a Jest-compatible API. The series covers first tests, assertions, lifecycle hooks, async testing, and the full mocking system—vi.fn(), vi.spyOn(), vi.mock(), and the mockReset semantics that differ from Jest. It moves into configuration, environments, coverage, parameterized and concurrent tests, then into v4 features: stable Browser Mode, component testing, visual regression with toMatchScreenshot, and the projects configuration that replaces the deprecated workspace option. It closes with type testing, test fixtures, soft assertions, migration from Jest, and CI integration.
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