Debugging failing Vitest tests
The guide provides methods for investigating test failures, including reading error output, isolating problems, identifying common causes, and using available debugging tools.
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Vitest
https://vitest.devVitest Documentation for AI Search & MCP on Test Configuration and Browser Testing
Vitest documentation provides guidance on configuring testing frameworks, performing browser-based tests, and advanced API usage. It details mocking, benchmarking, and debugging, enabling AI agents to configure test environments, debug failing tests, and integrate advanced testing features.
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Use Vitest Documentation to complete source-specific tasks, make informed decisions, and follow evidence-backed workflows.
Writing robust browser-based assertions
Vitest documentation details a wide range of DOM assertions, forked from @testing-library/jest-dom, with added support for locators and built-in retry-ability to handle asynchronous browser tests.
Mocking classes for isolated unit testing
The documentation provides guidance on how to mock entire classes using vi.fn or vi.spyOn().mockImplementation(), distinguishing between class fields and prototype methods for effective isolation.
Configuring custom module aliases for tests
The documentation explains how to define custom aliases using the alias configuration option, which merges with resolve.alias for module resolution during testing.
Running performance benchmarks with Vitest
The documentation describes how to define and execute benchmarks using the bench fixture within the test context, leveraging Tinybench for performance metrics and comparison tables.
Extending browser locators for custom components
The guide explains how to use locators.extend to add domain-specific locators for custom components, retaining auto-retry and strict-mode protection for enhanced test readability and reliability.
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What's Indexed from Vitest
A quick look at the main areas Bulkgrid has indexed and keeps ready for AI search, MCP, extraction, and change detection.
Config
/docs/config
109 pages
Details various configuration options for Vitest, including module aliasing, test execution behavior, and browser-specific settings, enabling users to customize their testing environment.
Guide
/docs/guide
77 pages
Offers detailed guidance on using Vitest, covering topics from advanced API usage and benchmarking to browser-specific testing, mocking, and debugging strategies.
API
/docs/api
30 pages
Documents the core Vitest API, including assertion functions, test organization utilities like "describe" and "test", and advanced features for browser mode and plugins.
Config — Browser
/docs/config/browser
22 pages
Configures browser-specific settings for Vitest, including custom commands, connection timeouts, and options for headless mode, enabling tailored browser testing environments.
API — Advanced
/docs/api/advanced
13 pages
Explores advanced APIs for extending Vitest functionality, such as managing test artifacts, integrating plugins, customizing reporters, and interacting with the test runner programmatically.
Recipes
/docs/guide/recipes
12 pages
Offers practical solutions and patterns for common testing scenarios, including extending browser locators, managing cancellable resources, and implementing custom assertion helpers.
Learn
/docs/guide/learn
9 pages
Guides users through fundamental testing concepts in Vitest, covering debugging strategies, mocking functions, snapshot testing, and handling asynchronous code effectively.
API — Browser
/docs/api/browser
8 pages
Details the API specifically designed for browser testing, including DOM assertions, custom commands, context API, and integration with frameworks like React, Svelte, and Vue.
Guide — Browser
/docs/guide/browser
8 pages
Explains how to utilize Vitest's browser mode for component testing, ARIA snapshots, visual regression, and integrating with Playwright traces to enhance web application testing.
Mocking
/docs/guide/mocking
8 pages
Provides detailed instructions on creating mocks for various entities like classes, functions, modules, dates, and the file system to isolate code during testing.
Blog
/docs/blog
5 pages
Contains official announcements and release notes for various Vitest versions, highlighting new features, improvements, and important updates for users.
Guide — Advanced
/docs/guide/advanced
5 pages
Guides library authors and advanced users on programmatically running tests, customizing benchmark providers, extending reporters, and managing custom test pools.
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