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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 errorsPlan design-system testing as a set of checks with distinct jobs—not as a single component test or a compliance badge. Define what each component promises, test its logic and documented states, check rendered changes, manually evaluate accessibility, and then test the assembled service. A passing library test is evidence about the library; it does not certify every product that uses it.
Start with a testable contract
Before choosing tools, write down what the system supports and what “working” means. Make the contract specific enough that a developer can turn it into a test, and a reviewer can decide whether a reported failure is real.
For each component, record:
- Purpose and public API: what problem it solves, its inputs and outputs, and supported configuration.
- States and behavior: default, active, disabled, loading, validation or error states as applicable; expected response to pointer, keyboard, and other supported input.
- Semantics and accessibility criteria: required names, roles, relationships, focus behavior, and other acceptance criteria.
- Responsive expectations: supported viewport ranges and what should happen when text is long, content is empty, or layout space is constrained.
- Support boundaries: browsers, operating systems, assistive technologies, and known limitations the system intends to support.
Set the applicable accessibility target explicitly: name the WCAG version and level, relevant jurisdiction, and the date from which the requirement applies. Laws and product obligations vary, and standards evolve; do not treat a system’s general conformance statement as a substitute for checking the requirements that apply to your product. For example, GOV.UK’s Service Manual describes GOV.UK Frontend as meeting WCAG 2.2 AA; that statement applies to that system, not automatically to other libraries or services. See GOV.UK’s accessibility guidance for developers.
Rank risks by consequence and reach. Give priority to legal or regulatory obligations, failures that only the design-system team can fix, and defects likely to spread across many consuming services. Define in advance who assesses disputed findings, how severity is assigned, and which failures block a release.
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No single layer answers every question. Use quick, repeatable checks for component logic and markup, then add checks that cover user tasks, appearance, assistive technology, and the consuming product.
| Layer | Best suited to | Limit to account for |
|---|---|---|
| Unit tests | Isolated logic, state transitions, and code paths within a component. | They do not establish that a rendered interface is understandable or usable. |
| Feature or integration tests | Whether a person can complete an important interaction, such as expanding an accordion or switching a tab. | They take more time to run and diagnose; use them for meaningful journeys rather than enumerating every possible scenario. |
| Automated accessibility checks | Detecting some machine-checkable markup and accessibility-rule violations in rendered examples and states. | A clean result is not proof of conformance or usability; automation cannot judge every label, task, or interaction. |
| Visual regression review | Flagging unintended changes in layout, typography, color, focus appearance, or spacing across selected states and viewports. | A screenshot difference needs human review; rendering changes can be intentional, and a baseline covers only what was captured. |
| Manual accessibility and usability review | Keyboard operation, screen-reader comprehension, magnification, contrast or display modes, and real interaction quality. | Requires planned coverage, appropriate people and platforms, and findings recorded in a way maintainers can act on. |
| Consuming-service tests | Whether the assembled service—including its content, overrides, and application behavior—works for users. | Cannot be replaced by passing tests on the reusable library alone. |
GOV.UK’s developer documentation describes unit tests as the largest-volume layer in its library’s test pyramid, with higher-level feature tests used more selectively because they are slower and harder to debug. Treat that as an implementation example, not a mandatory ratio for every team. The useful principle is to run the broad, fast checks often and reserve higher-cost checks for important behavior and risk.
Cover documented examples and meaningful states
A test suite that exercises only a component’s default example can miss defects in its other documented variants. Build coverage from the public contract: include every documented example that represents a supported configuration, then add meaningful interaction states and edge cases that could change behavior or accessibility.
- Test empty, typical, and unusually long content where the component accepts content.
- Exercise validation and error states for controls that can report errors.
- Check keyboard paths and focus behavior for interactive components.
- Include responsive conditions and supported viewport sizes, rather than assuming a desktop default represents all layouts.
- Verify that documentation examples actually render and run the JavaScript they demonstrate.
GOV.UK’s accessibility strategy says that, by May 2023, its process tested every example code snippet for each component rather than only the first example, and executed JavaScript in examples. Use the same coverage principle where examples are part of your system’s public contract, while choosing examples and test data for your own audience and component API. See the GOV.UK Design System accessibility strategy.
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Run unit and integration tests, HTML validation, and suitable automated accessibility checks in development and continuous integration. Apply accessibility checks to each meaningful example and state that can be rendered reliably. Record exclusions with a reason and an owner; otherwise, an uncovered case can quietly become a permanent blind spot.
GOV.UK describes using jest-axe and @axe-core/puppeteer against design-system examples. Its developer documentation also describes an axe wrapper that can raise JavaScript errors and fail a CI build. These are examples of how a team can wire repeatable checks into its own workflow, not a requirement to use those tools or an assurance that they catch every issue.
Keep percentage claims in context. The GOV.UK strategy attributes a finding of about 30% of issues detected by automated testing tools to a 2017 GDS study. A separate Intelligence Community Design System page gives a different estimate, 30–50% of accessibility problems; the reviewed page does not state a year. These are distinct source formulations, not a universal detection rate for every tool or product. The planning implication is straightforward: automated scans can help find some defects, but they cannot replace manual assessment.
Decide how CI results affect delivery. Some checks can be merge-blocking when their pass condition is stable and their failure has clear ownership. Other results may call for review rather than an automatic block, especially when the check involves visual diffs or requires human judgment. Set the policy per check, including who may approve an exception and where its rationale is recorded.
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Review visual changes against deliberate baselines
Capture relevant components, states, and viewports so an unexpected rendered change can be spotted. The baseline should represent the states you intend to support—not just a single attractive example. When a diff appears, review whether it affects typography, spacing, color, focus indication, content wrapping, or layout, and decide whether the change is expected before updating the baseline.
Choose the merge policy deliberately: a visual check may report differences for human review, or it may block until a reviewer approves them. In GOV.UK’s documented implementation, Percy screenshots run on each pull request, but the visual check is not a mandatory merge condition; a reviewer decides whether highlighted changes are acceptable. This illustrates a review workflow, not a universal standard. Visual comparison can reveal drift, but it does not establish that the new result is accessible or that an interaction works.
Capture a reference image for a visual review
If you want a screenshot of a rendered component example for a baseline or review, you can capture it from a browser yourself or use an API. An image capture supplies an artifact; your test process still needs to compare it with an approved baseline and have someone assess meaningful changes.
Or skip the browser setup
ScreenshotNeo is a website screenshot API and MCP server. Its API can return a screenshot or PDF from one GET request; it is a capture option, not a visual-diff or accessibility-conformance test. The API accepts options including full-page capture, CSS-selector element capture, viewport and device settings, custom CSS, waits, and blocking selected requests or resource types. Check the ScreenshotNeo API documentation for request details.
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Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Manually evaluate accessibility and usability
Plan hands-on checks around the ways people actually perceive and operate the interface. Depending on your supported platforms and audience, include keyboard-only use, visual and sensory inspection, HTML and accessibility-tree inspection, screen readers, screen magnifiers, high-contrast or other display modes, and speech recognition. Record the browser, operating system, assistive technology, and input method used so a finding has reproducible context.
Manual review answers questions a rule scan cannot: whether labels make sense, focus is understandable, a task can be completed with assistive technology, or a component remains usable in a real interaction. User research answers another question—how people with varied access needs experience the design. GOV.UK’s guidance recommends involving disabled participants and people with varied access needs, particularly where additional research is useful because a service is complex or sensitive.
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Best Value
Test the service that consumes the system
After library-level checks, exercise real products that use the components. GOV.UK’s Service Manual puts the distinction plainly: “Using the GOV.UK Design System in a service does not immediately make that service accessible.” A service can introduce barriers through its own HTML, CSS, JavaScript, content, component composition, or overrides, even when the underlying library passes its tests.
Test complete user tasks in the assembled interface, including the content and application logic around components. Check prototypes and designs before production as well as the resulting code; a defect in the chosen composition or interaction model may be easier to fix before it is implemented. Do not infer service-level accessibility from a component’s library test report.
Keep a maintainable test matrix
A concise matrix makes coverage, gaps, and responsibility visible. Tailor it to the users and platforms you support; a public-sector system’s exact browser and assistive-technology combinations may not fit another product.
| Matrix field | What to record |
|---|---|
| Component and state | The component, documented example, interaction state, and relevant content conditions under test. |
| Risk or acceptance criterion | The behavior or accessibility requirement the check is meant to establish. |
| Method | Automated test, visual review, manual assistive-technology check, or service-level task. |
| Platform context | Browser, operating system, viewport, assistive technology, and input method where relevant. |
| Expected result and owner | Observable pass condition and the person or team responsible for review and remediation. |
| Frequency and failure policy | When it runs, whether it blocks a merge, and who adjudicates a failure or visual change. |
| Exception rationale | Why coverage is excluded or deferred, who accepted the risk, and when the decision should be revisited. |
Revisit the plan when supported platforms, standards, APIs, component behavior, or product risks change. Historical GOV.UK process details are useful examples, not a permanent browser matrix or a substitute for checking current obligations.
Troubleshoot common planning failures
- Only the default example is tested: derive cases from all documented variants and meaningful states, and make examples executable where possible.
- CI is green but a task remains difficult: add a feature-level task test and manual review with relevant assistive technology; a rule scan checks only what it can evaluate.
- A visual diff repeatedly produces noise: verify that the baseline, test data, viewport, and rendering conditions are intentional, then assign a reviewer and explicit approval policy rather than automatically accepting every update.
- A component passes in isolation but fails in a product: investigate the consuming service’s markup, CSS overrides, JavaScript, content, and composition, then add a service-level task test for the failure.
- Teams disagree about an accessibility finding: record evidence and test context, assess severity against the stated acceptance criteria, and name who decides whether remediation or an exception is appropriate.
Frequently Asked Questions
Does a design system that meets WCAG make every product using it accessible?
No. Conformance claims apply to a defined system and scope; a consuming product must be assessed in its own context.
Should every visual difference fail a pull request?
Not automatically. Set a policy that routes diffs to an accountable reviewer, or blocks only when your team can define a reliable pass condition.
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