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Percy adds visual checkpoints to an existing test workflow: instrument meaningful page or component states, make the Percy project token available securely, run the appropriate Percy integration in pull-request CI, and review the resulting visual changes before accepting them. A visual difference is a prompt for human review—not proof of a defect.
How Percy fits into pull-request testing
Percy supplements functional tests rather than replacing them. Your existing tests drive the application or render components; Percy captures selected visual states and compares later builds with an approved baseline. That lets reviewers consider whether a UI change is intended alongside the code review.
The useful unit is not every possible screen. It is a focused set of important, stable views: a page after its key content has loaded, a component in a meaningful state, or a step in a user journey that the team wants to protect. There is no universal snapshot count established by the vendor tutorials; choose coverage based on the interface and the risks of changing it.
Plan snapshots that reviewers can interpret
Choose stable, user-visible checkpoints
Add a snapshot after the page or component reaches the state you intend to compare. Capturing too early can record loading placeholders, incomplete content, or asynchronous changes. Animations and other changing content can also create noisy differences, so stabilize the relevant state before capturing it.
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Name snapshots descriptively
Use a consistent naming pattern that identifies the page or component and the state, such as Checkout - shipping details or Product card - sale price. Clear names help reviewers locate the affected view and understand what the test represents.
Choose component stories, end-to-end journeys, or both
Storybook is suited to capturing component states in isolation. End-to-end tests cover pages or user journeys in the running application. A team can use either approach or both; the choice depends on what its pull-request review needs to exercise and which framework is already part of its workflow.
Set up a Cypress integration
Percy’s Cypress vendor tutorial demonstrates installing @percy/cli and @percy/cypress, adding cy.percySnapshot(...) at a meaningful point in a test, supplying the project token through an environment variable, and wrapping the Cypress run with Percy. These package names and commands are tutorial examples, not a guarantee that they are current for every project or CLI version. Confirm the current Percy integration instructions for your framework before adopting them.
1. Install the integration packages
For the Cypress integration demonstrated by Percy, the tutorial uses:
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npm install --save-dev @percy/cli @percy/cypressCheck the current Cypress integration documentation for supported package names, setup requirements, and any version-specific instructions.
2. Add a snapshot at a meaningful test checkpoint
After the test has navigated to the target page and established the state you want to protect, add a snapshot call. For example, the Cypress integration uses this form:
cy.percySnapshot('Checkout - shipping details')Place the call only after the required content is ready. If your test reaches the same view in different states, give each checkpoint a name that distinguishes the state rather than reusing an ambiguous label.
3. Supply the project token securely
Create or select the Percy project and make its project token available to the run as an environment variable. The Cypress tutorial demonstrates environment-variable configuration. In CI, store the token in the CI provider’s secret mechanism and expose it to the job; do not commit it to source control or embed it in a test file. The exact secret-setting steps depend on your CI provider.
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4. Run the Cypress test through Percy
The vendor Cypress example runs:
npx percy exec -- cypress runThis is specifically the demonstrated Cypress wrapper. Do not assume it is the right command for Storybook, Playwright, Selenium, another framework, or every version of the Cypress integration. Verify the current instructions for the integration you use.
Run Percy from pull-request CI
Add the Percy-enabled test command to the CI job that runs for pull requests. The job should make the project token available as a secret, execute the relevant instrumented tests, and publish the resulting visual build for review. Percy’s vendor material describes CI as part of this workflow, but it does not establish a universal configuration or exact status-check behavior for every CI provider and repository.
- Choose the existing pull-request test job. Use the job that already installs dependencies and runs the relevant Cypress tests, or create a dedicated visual-testing job if that better fits your CI design.
- Configure the token as a CI secret. Reference the secret through the provider’s environment-variable mechanism; avoid printing it in logs.
- Use the integration-specific command. For the Cypress tutorial example, the command is
npx percy exec -- cypress run. For another framework or Storybook, follow its current Percy integration guide instead of copying this command. - Open the visual build during review. Reviewers should inspect the changed snapshots in the context of the pull request and decide whether each difference is expected.
Storybook and other framework workflows
Storybook
Percy’s vendor tutorial describes building a static Storybook, setting the Percy token, running Percy against the Storybook output, and integrating that command into CI. The exact current commands and options are not established here, so use Percy’s current Storybook instructions rather than adapting the Cypress wrapper. This approach is useful for component states; it does not automatically cover complete end-to-end journeys.
Playwright, Selenium, and other frameworks
Percy’s vendor material mentions frameworks including Playwright and Selenium, but no verified current commands for those integrations are established here. Follow the current Percy guide for the framework and CI provider you use. Keep the same general workflow—capture deliberate stable states, supply the project token securely, run from pull-request CI, and review the resulting differences—without assuming Cypress-specific setup applies.
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Review visual changes and update the baseline carefully
The first accepted visual state establishes the comparison point. Later builds report differences from that baseline. A difference may be an intended design update, an unintended regression, or capture noise; the diff alone cannot tell you which.
- For an intended change: inspect it in context and approve the new appearance so it becomes the expected visual state.
- For an unintended change: fix the UI or test setup, rerun the relevant checks, and review the new result.
- For a noisy difference: check whether the snapshot ran before the interface stabilized or included animation or asynchronous content, then make the capture state more deterministic.
Do not approve diffs mechanically. A passing functional test does not establish that the interface still looks right; visual review is a separate judgment in pull-request review.
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No visual build appears for a pull request
Check that the pull-request CI job actually runs the Percy-enabled command, that the project token is available to that job, and that the command matches the integration in use. Also verify the current integration instructions and CI configuration; the Cypress command shown above is not universal.
The run cannot connect to the intended Percy project
Confirm that the token belongs to the project you meant to use and that CI exposes it under the environment variable expected by the current integration. Ensure the secret is configured for the pull-request job and is not accidentally missing from the relevant execution context.
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Snapshots show inconsistent or noisy differences
Move the snapshot checkpoint until after the relevant content is ready. Review whether asynchronous data, animation, or other changing UI is being captured. Use descriptive names and keep the snapshot set focused on important user-facing states.
The documented package or command does not work
The Cypress installation and wrapper in this guide come from a vendor tutorial and may not match current package versions or every project configuration. Verify package names, setup steps, and options in Percy’s current documentation for your framework, then use that integration’s command rather than extrapolating from Cypress.
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Does Percy replace functional tests?
No. It adds visual snapshots to an existing test workflow; functional tests still check behavior.
How many Percy snapshots should a pull request include?
There is no universal optimal count established by the vendor tutorials. Select important, stable states that give reviewers useful coverage without capturing every possible view.
Can I use Percy’s Cypress command with Storybook or Playwright?
Do not assume so. Use the current integration instructions for the framework you are running; the command shown here is the Cypress tutorial example.
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