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1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errorsTest a design system with complementary checks: use component stories to cover representative states, interaction tests to verify behavior, visual regression checks to catch appearance changes, accessibility audits to find common issues, and selective end-to-end tests for integration risks. Run the relevant checks in CI whenever shared components change; no single test proves a component is correct in every dimension.
Start with the component contract and its important states
For each component, write down its public API and the situations it promises to handle. That contract—not every theoretical combination of props—should guide the tests.
- List supported props, variants, sizes, and responsive modes.
- Include consequential states such as empty, populated, loading, disabled, and error states where they apply.
- Identify meaningful user paths, such as opening a dialog, selecting an option, or submitting a form.
- Note cross-cutting promises such as supported browsers, languages, zoom behavior, and design-token use.
Use stories as reusable, isolated examples of these states. A basic story can serve as a render smoke test: it passes if the component renders and fails if rendering throws an error. Storybook describes component tests as browser-rendered, interactive tests of a single UI unit that can also mock dependencies or manipulate data. Storybook component testing documentation explains the approach.
Test behavior with realistic interactions
A rendered component can still behave incorrectly. For stateful components, test what a user does and what the component should do in response. Storybook play functions can set up state, mock dependencies or network responses, simulate interaction, and assert outcomes.
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- Arrange the story in a meaningful starting state, including any required mocked data or dependencies.
- Perform the user action: type, open, select, submit, or otherwise interact with the rendered UI.
- Assert the observable result at the component boundary, such as a dialog opening or an error message appearing.
- Keep assertions focused on the public behavior rather than incidental implementation details.
These tests are useful for component-level behavior without requiring the entire product to run. They do not replace end-to-end tests when the behavior depends on the application stack.
Use visual regression tests for appearance
Behavior tests do not establish that a component still looks right. Capture representative stories and compare them with an accepted visual baseline. Review differences when component code, styles, or design tokens change. Storybook documents cross-browser visual testing with Chromatic and notes that stories can serve as visual tests. Storybook visual testing documentation
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A screenshot can reveal unintended layout, typography, color, or spacing changes, but it cannot prove keyboard behavior, data handling, or accessibility. Pair visual checks with interaction and accessibility checks rather than treating a matching image as a complete test.
Check accessibility automatically and manually
Automated accessibility checks are useful for finding common problems in a rendered DOM. Storybook’s accessibility addon audits against heuristics informed by WCAG and other accepted practices. The documentation attributes an estimate of up to 57% of WCAG issues detected to axe-core; that is a stated detection estimate, not a guarantee that automation finds all barriers. Storybook accessibility testing documentation
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Run the automated checks alongside component tests and review reported violations. If a result is marked incomplete or requires manual review, treat it as a prompt to inspect the case—not as a pass. Depending on the component, assess keyboard operation, accessible names and semantics, contrast, zoom, and reduced-motion behavior with human review and appropriate assistive technologies.
Test the design system’s broader promises
Some quality requirements are not captured by an isolated render or interaction test. Adapt checks to the system’s own support matrix. The CMS Design System’s component-maturity guidance offers examples rather than universal thresholds. CMS Design System component maturity guidance
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- Responsive support: inspect the breakpoints the system claims to support.
- Zoom: check at 400% zoom and confirm content remains available without overlap or forced horizontal scrolling, where that is part of the system’s accessibility expectations.
- Language: change the language and verify that default text updates appropriately.
- Design-to-code parity: compare code props and options with the corresponding Figma component.
- Token use: verify that styles use existing design tokens in both code and Figma when the system promises token alignment.
Run the right checks in CI
Configure CI to run relevant story-based checks on pull requests that affect shared components. This brings render, interaction, and other configured failures to light before merge. Keep the feedback focused on the changed components and their meaningful states.
Coverage reports can show untested branches or interactions and help identify state gaps. They are a risk-assessment aid, not a target to maximize for its own sake; Storybook cautions against treating 100% coverage as a universal goal. Decide whether missing coverage matters by considering the public API, user impact, and likelihood of regression.
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Reserve end-to-end tests for integration risks
Use Playwright or Cypress when a behavior depends on the running application, real integration boundaries, or a workflow spanning multiple components. Reusing stories can provide known starting states for these tests. Keep isolated component tests for fast feedback on component contracts; choose end-to-end tests for risks that cannot be exercised meaningfully in isolation.
| Method | Best at catching | Environment and interpretation |
|---|---|---|
| Story render smoke test | Render failures and broken representative states | Isolated story; usually straightforward pass/fail |
| Interaction test | Incorrect response to user actions or state changes | Browser story with simulated interaction and assertions |
| Visual regression | Unintended appearance changes | Story snapshots compared with a baseline; differences need review |
| Accessibility audit | Common issues detectable from rendered markup and configured heuristics | Rendered DOM; incomplete findings and broader usability need human review |
| End-to-end test | Integration and full-workflow failures across the application stack | Running product; broader environment and workflow required |
Storybook notes that component tests can be expensive to maintain when applied wholesale to every component. Prioritize consequential public states and combine methods according to the failure modes they catch, rather than adding every test type to every component.
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Quick Recap
Troubleshoot common test failures
- A story fails to render: check its required props, providers, and mocked dependencies; verify the state represented by the story is still supported.
- An interaction assertion fails: confirm the test starts from the expected state and that the assertion describes user-visible behavior, not a private implementation detail.
- A visual comparison reports differences: review the changed story and determine whether the change is intentional. If so, update the accepted baseline through the team’s normal review process; otherwise fix the component or token regression.
- An accessibility check is incomplete: inspect the flagged case manually, including the relevant keyboard, semantic, contrast, or assistive-technology behavior.
- A full workflow fails but the component test passes: investigate integration dependencies and application state; that is the kind of risk an end-to-end test is intended to cover.
- CI reports a coverage gap: assess whether the missing branch represents an important public state or high-impact behavior before adding tests; a coverage percentage alone does not establish quality.
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