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Use Storybook’s @storybook/addon-vitest to run stories as browser-based component tests with Vitest. To compare screenshots against accepted visual baselines, add Storybook’s separate visual-testing workflow—running the Vitest component tests alone does not create screenshot comparisons.
First, know which kind of test you need
Storybook’s Vitest addon turns stories into component tests. It checks that a story renders and, when the story defines a play function, runs that interaction and its assertions in a browser. The documented default browser is Playwright Chromium.
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Visual tests answer a different question: does the rendered appearance still match an accepted screenshot baseline? Storybook documents a separate visual-testing workflow using the @chromatic-com/storybook addon and Chromatic. With that visual addon installed, its results can appear alongside component tests in Storybook’s testing widget, but screenshot comparison is not an automatic feature of running Vitest component tests.
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| What you want to verify | Workflow | What you review |
|---|---|---|
| Stories render and interactions behave as expected | Storybook Vitest addon | Test status, assertions, and story failure/debug links |
| Story screenshots have not changed unexpectedly | Storybook visual testing with Chromatic | Highlighted screenshot changes compared with accepted baselines |
Storybook describes the goal succinctly: “Visual tests catch bugs in UI appearance.” See its Visual tests documentation.
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Check compatibility before installing
- Your Storybook framework must be Vite-based. Storybook lists React, Vue, Preact, SvelteKit, and Next.js Vite among its examples.
- Use Vitest 3.0 or newer, as specified in the current addon guide.
- For the documented Next.js Vite path, use Next.js 14.1 or newer with
@storybook/nextjs-vite. - If your project uses MSW, the guide says to use MSW 2.0 or newer to avoid conflicts with Vitest’s dependency.
- If your Storybook project uses Webpack or Rsbuild, the Vitest addon route is not the documented fit. Storybook’s migration guide says to continue with
@storybook/test-runnerunless you move to a supported Vite framework.
These are the compatibility requirements stated in Storybook’s documentation checked on October 3, 2026; consult the current Vitest addon guide before upgrading because supported versions can change.
Install and run the Vitest addon
- From your project root, run
npx storybook add @storybook/addon-vitest. The setup command installs and registers the addon, checks the project’s Vite/Vitest configuration, configures defaults where needed, and enables browser mode with Playwright Chromium. It may prompt you to install Playwright browser binaries. - Run the generated Storybook Vitest project with
npx vitest --project=storybook. The addon’s project can run without starting a Storybook server. - To make the command easy to use locally and in CI, add a package script such as
"test-storybook": "vitest --project=storybook", then runnpm run test-storybook.
The command and project name are the documented setup path; if the add command cannot configure your repository, use the manual setup steps below rather than layering guesses onto the generated config.
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What the addon tests in each story
The addon uses portable stories to transform your stories into tests. A story that renders successfully can pass its render check. If a story has a play function, the test executes it and validates its assertions as part of the story test. This makes the workflow useful for component behavior as well as basic rendering; it does not, by itself, establish a screenshot baseline.
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Browser mode runs the test in a real browser rather than a simulated DOM such as JSDOM or Happy DOM. Storybook recommends browser mode for component work because browser-dependent APIs and behavior are better represented there. Playwright Chromium is the default setup described by the addon documentation.
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Add screenshot-based visual tests and baselines
- Set up Storybook’s
@chromatic-com/storybookvisual-testing addon and link the Storybook project to Chromatic. This is a separate setup from adding@storybook/addon-vitest. - Run the initial visual build. The first build creates screenshot baselines for the stories.
- On later runs, inspect the Visual Tests panel for highlighted changes. Compare each change with the intended UI update.
- Accept intentional appearance changes as new baselines. If the change is unintended, fix the component or story and run the visual tests again.
Storybook also points to storybook-addon-vis as a local option for image snapshot testing. The documented workflow and review experience differ, so choose the approach that fits whether you want the hosted Chromatic flow or a local snapshot option. See Storybook’s visual-testing guide for its Chromatic setup and baseline review.
Manual setup when the automatic command does not work
Use Storybook’s manual addon instructions rather than copying a generic Vitest configuration: the exact setup depends on the existing Vite configuration and Vitest version.
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- Confirm that Vite and Vitest are configured for the project.
- Configure Vitest browser mode and make Playwright Chromium available.
- Install and register
@storybook/addon-vitestin Storybook’s configuration. - Create
.storybook/vitest.setup.tsas described in the addon guide. - Include the Storybook plugin in the Vitest configuration and run the Storybook project.
If the repository already has ordinary Vitest tests, Storybook recommends isolating the Storybook tests in a separate Vitest project or workspace configuration. Configuration details vary by Vitest version; use the current addon instructions for the version installed in your project.
Run the tests in CI and make failures easier to open
Use the same vitest --project=storybook command in CI that you use locally. The CI environment must have Playwright and its browser dependencies available; Storybook’s CI examples use Playwright container images. See Storybook’s testing-in-CI guide for its setup examples.
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- Clickable links while watching locally: configure
storybookScriptso the addon can start Storybook and provide links from test failures to the relevant stories. - Links to a published Storybook in CI: build and publish Storybook first, then configure
storybookUrlwith the published URL. Without the published Storybook, CI cannot link failures to that deployed story view. - Different results between interfaces: Storybook notes that Vitest CLI/addon execution can differ from results in the Interactions panel. When behavior disagrees, verify the execution path and environment before treating it as a product regression.
Troubleshoot common setup failures
- The addon setup or tests fail on a Webpack or Rsbuild project. The documented Vitest addon path requires a Vite-based Storybook framework. Continue with
@storybook/test-runneror migrate Storybook to a supported Vite framework; see the migration guide. - Playwright cannot launch in CI. The browser or its system dependencies may be missing from the CI image. Use an environment with Playwright installed and available browser dependencies, following Storybook’s CI guidance.
- Existing tests conflict with Storybook’s generated project. Separate Storybook’s tests into an isolated Vitest project/workspace configuration. Follow the addon guide for your Vitest version rather than assuming all versions use identical workspace syntax.
- MSW-related dependency conflicts appear. If MSW is in use, check that it is version 2.0 or newer, as required by the addon guidance to avoid conflicts with Vitest’s dependency.
- A failed test has no useful story link. In watch mode, configure
storybookScript; for CI links, publish Storybook and configurestorybookUrl. - A component test passes but a visual change is missed. The Vitest component test is not a screenshot-baseline comparison. Add and run the separate visual-testing addon workflow.
Or skip the browser setup
For a screenshot of a URL without configuring a browser test project, ScreenshotNeo provides a one-call screenshot API. It is a separate service from Storybook’s story-based component and visual-testing workflows; it captures a webpage URL rather than running your Storybook stories against Chromatic baselines.
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ScreenshotNeo API documentation
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpScreenshotNeo removes cookie banners, newsletter popups, and chat widgets before capture; bot checks, blank pages, failed loads, timeouts, and cache hits are not billed. Its MCP server provides screenshot tools for AI agents, and the Free plan includes 1,000 screenshots per month without a card; paid plans start at $5 for 3,000 screenshots. See ScreenshotNeo or sign up for 1,000 free screenshots a month with no card.
Sources
- Storybook: Vitest addon
- Storybook: How to test UIs with Storybook
- Storybook: Testing in CI
- Storybook: Visual tests
- Storybook: Migrating to Vitest addon from test-runner
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