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Vitest 4 supports visual regression testing in Browser Mode with toMatchScreenshot. Run a real browser through a Vitest browser provider, capture a page or element, review the first screenshot as a baseline, then commit that baseline so later runs can detect visual changes. The key to useful results is a stable browser and operating-system environment—not a permissive diff threshold.
What Vitest 4 visual regression testing does
A visual regression test compares a screenshot from the current run with a saved reference image. It can catch changes in styling, layout, viewport rendering, and other visual details that functional assertions may not detect. Vitest 4 adds this capability in Browser Mode through the toMatchScreenshot assertion. Vitest 4 release announcement · Visual regression testing guide.
This is not a replacement for unit or interaction tests: it answers whether the rendered result changed, not whether the change is correct. A mismatch is a review prompt. Inspect it, decide whether the new appearance is intended, and update the baseline only when that change is accepted.
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Set up a dedicated Browser Mode project
Install a browser provider such as @vitest/browser-playwright, then configure Vitest Browser Mode according to the provider setup in the official guide. Keep visual tests in a dedicated project and run that project separately from unit tests. A filename convention such as [name].vrt.test.[ext] makes the purpose of the tests easy to recognize.
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The exact provider configuration can depend on the provider and the rest of your Vitest setup, so use the current provider-specific setup instructions rather than copying a configuration for a different provider. For repeatable comparisons, run the browser headlessly and keep its version and settings fixed between baseline creation and comparison.
Write a screenshot assertion
In a Browser Mode test, import expect and test from vitest, and page from vitest/browser. Navigate to or render the UI, then assert on the page or a specific element:
import { expect, test } from 'vitest'
import { page } from 'vitest/browser'
test('product page matches its visual baseline', async () => {
await page.goto('/products/widget')
await expect(page).toMatchScreenshot('product-page')
})
test('navigation matches its visual baseline', async () => {
await page.goto('/products/widget')
const navigation = page.getByRole('navigation')
await expect(navigation).toMatchScreenshot('product-navigation')
})The example illustrates the assertion flow; adapt navigation and element selection to your application and Browser Mode setup. Use a page assertion when the whole view matters. Use an element assertion when you want a smaller, more focused baseline—for example, for a navigation bar whose appearance can be reviewed independently.
toMatchScreenshot accepts a name or options. The name gives the reference a recognizable identity; options can be supplied per assertion when a particular capture or comparison needs different settings. The official guide also documents global comparator configuration in vitest.config.ts and per-assertion configuration.
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Create, review, and maintain baselines
- Run the visual test for the first time. Vitest captures a screenshot and creates a reference baseline. The first run reports that the image must be reviewed.
- Inspect the initial image. Confirm it shows the intended UI at the intended state and that dynamic content has not made it unsuitable as a reference.
- Commit the approved baseline. Vitest stores images in
__screenshots__folders beside the tests. Include the reviewed files in version control so other developers and CI compare against the same reference. - Review future mismatches before updating. A changed image may indicate a regression or an intentional design change. Accept the visual change first; only then replace the baseline and commit that update.
- Clean up obsolete files yourself. Vitest does not automatically remove screenshots belonging to deleted or renamed tests. Remove stale images manually after confirming they are no longer needed.
Read a failure and its diff
On a mismatch, Vitest can show the reference image, the newly captured actual image, and a diff image when the image dimensions permit. Use them together: the reference says what the test expected, the actual says what this run rendered, and the diff highlights where they differ.
- Red pixels indicate changed areas.
- Yellow pixels indicate anti-aliasing differences when anti-aliasing is not ignored.
- Different dimensions can point to a viewport, layout, or capture-scope change; a diff image may not be available in that case.
Start by checking whether the change is real and repeatable, then look for environment drift or dynamic content. Only after stabilizing those inputs should you adjust comparator tolerance.
Choose tolerances without hiding regressions
The documented pixelmatch example uses a color threshold and an allowedMismatchedPixelRatio. The guide illustrates values of threshold: 0.2 and allowedMismatchedPixelRatio: 0.01; these are example settings, not measured defaults or guarantees. Configure the comparator globally in vitest.config.ts or on the individual assertion, depending on whether the policy should apply broadly or only to one capture.
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Make screenshots consistent between a laptop and CI
A screenshot can vary even when application code has not changed. Relevant sources of rendering differences include GPU and drivers, hardware acceleration, operating system, font rendering, browser version and settings, headed versus headless mode, screen scaling, and color profile. Keep the baseline and CI comparison in the same browser and platform configuration wherever possible.
- Pin the browser version and use the same browser settings in baseline and CI runs.
- Standardize the operating system, fonts, screen scaling, and color profile.
- Use a fixed viewport and consistent test data and UI state.
- Run visual tests headlessly in a controlled environment.
- When a developer machine cannot match CI reliably, consider a standardized Docker container or cloud browser environment. The Vitest v4 guide specifically points to services such as Azure App Testing and Docker containers as options for standardizing execution: Vitest v4 Browser Mode guide.
Standardization is generally more useful than broadening the mismatch allowance: it reduces avoidable variation while preserving sensitivity to real changes.
Choose the scope and execution approach
| Decision | When it fits | Trade-off |
|---|---|---|
| Browser provider: Playwright, WebdriverIO, or preview | Choose a provider that fits your existing Browser Mode setup and the browser context your test needs. | Provider setup and the execution environment affect repeatability; follow the provider-specific configuration. |
| Environment: developer machine, container, or cloud | A local run is convenient during development; a container or cloud environment can standardize execution for CI. | Local convenience may mean more variation across machines. A standardized environment adds setup but helps align baseline and CI rendering. |
| Assertion scope: element or page | Use a page for a full-view check or an element for an independently meaningful component. | A focused element capture narrows what is reviewed; a page capture includes more surrounding layout. |
| Comparator and tolerance | Use comparator options for a known, limited source of harmless pixel variation. | Excessive tolerance may conceal a real regression. Stabilize the environment first. |
| Baseline review and updates | Commit approved images and review diffs as part of the change that alters the UI. | Baseline updates are deliberate maintenance work; obsolete screenshots need manual cleanup. |
Troubleshoot common failures
The first run fails because a reference is missing
This is the expected baseline-creation step, not necessarily a test defect. Review the generated screenshot, then commit it if it represents the intended UI. Do not accept a baseline without checking its content.
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Compare browser version and settings, operating system, fonts, GPU and driver behavior, headless or headed mode, screen scaling, and color profile. Standardize the execution environment and viewport before changing tolerance.
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The diff contains small scattered changes
Check font availability and rendering, browser settings, color profile, and whether anti-aliasing is ignored. If the variation is understood and genuinely harmless, adjust comparator behavior narrowly; avoid raising a global allowance without considering what changes it could let through.
The mismatch appears to come from changing page content
Make the test state deterministic: use stable test data and ensure the page is at the intended state before capture. If content is still changing or a component has not rendered, the screenshot may be capturing different moments rather than a code regression.
The diff image is absent or difficult to interpret
Vitest provides a diff when dimensions permit. Compare the reference and actual images directly if dimensions changed, then inspect viewport and layout configuration. A changed size can itself be the visual regression.
Old screenshot files remain after a test rename or deletion
Vitest does not automatically prune those files. Check the adjacent __screenshots__ directory and remove confirmed stale baselines manually.
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Frequently Asked Questions
Can Vitest visual regression tests replace functional tests?
No. They check rendered appearance against an image baseline; functional tests still verify behavior and application logic.
Does Vitest automatically delete baselines for removed tests?
No. Remove obsolete screenshots from the test’s adjacent __screenshots__ directory manually after confirming they are stale.
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