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Use Angular component tests to verify behavior and DOM output, then use Happo’s Storybook integration to catch visual regressions. Keep the two checks complementary: the available documentation supports a Storybook-based Happo workflow, not a direct Happo adapter for Angular’s TestBed.
What each test should cover
An Angular component combines a TypeScript class with an HTML template. Angular’s component-testing guidance recommends checking that those parts work together as intended in the rendered DOM. Use those tests for behavior: for example, whether an action updates state, whether the right text appears, or whether a control is disabled in the expected condition. Angular documents component testing with TestBed.
Happo’s documented component-oriented route is different: render representative UI states as Storybook stories, capture screenshots, and compare them with earlier captures. That makes it useful for appearance changes such as layout, spacing, typography, and responsive presentation. It does not replace functional assertions.
Check the Angular test runner in your project
Do not assume every Angular project uses the same runner. Angular’s current testing overview says newly created Angular CLI projects use Vitest and jsdom by default; Karma remains supported for existing projects. The ng test command runs the project’s configured test target.
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- Check the Angular version and the test target in
angular.json. - Run the project’s existing command, commonly
ng test, and confirm which runner it invokes. - Keep the established runner and component assertions; add visual checks separately through Storybook and Happo.
This avoids changing a working test setup merely to add screenshot comparisons.
Set up a Storybook-based visual workflow
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Keep behavioral component tests
Use the project’s Angular test setup to instantiate components and assert important rendered behavior. Include the states and interactions that represent real requirements; screenshots alone cannot prove that logic is correct.
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Expose useful states as stories
Create Storybook stories for component states that reviewers need to see. Depending on the component, that might include its default, loading, error, disabled, or expanded state. These are practical examples, not a mandatory Happo list.
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Configure Happo’s Storybook integration
Happo documents a Storybook screenshot-testing integration: stories are captured and compared with prior captures. Configure the integration using its current documentation and the setup appropriate to your project; the available sources do not establish exact package versions or an Angular-specific installation command.
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Run visual checks in CI and review changes
Run the relevant story captures in your CI workflow. Happo describes review links and side-by-side, diff, and swipe comparison views. Inspect a difference before treating it as a defect: rendering changes can be intentional, and image noise can create insignificant diffs. Happo also describes a tolerance setting for reducing insignificant image noise.
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Use interactions when a story needs to reach a state
Happo describes interaction-driven screenshots, which can drive a story into a UI state before capture. Use that when the state cannot be represented just by rendering the story as-is, and retain Angular tests for the underlying behavior.
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What Happo adds—and what it does not
| Need | Use | Boundary |
|---|---|---|
| Verify component logic and interactions | Angular component tests | A screenshot comparison does not establish that event handling or state transitions are correct. |
| Spot changes in rendered appearance | Happo captures of Storybook stories | Review diffs; not every pixel difference indicates a user-visible defect. |
| Check multiple browser and viewport renderings | Happo’s documented browser and viewport options | These are vendor-described capabilities, not an independent compatibility test result. |
| Review visual changes in CI | Happo review links and comparison views | Use the current integration documentation for project-specific configuration. |
| Include accessibility regression checks | Happo describes an option to include them with screenshot runs | This does not replace functional tests or a complete accessibility audit. |
Direct TestBed integration is not established
The sources available for this workflow document Happo’s Storybook integration, but do not verify a direct integration that runs Happo inside Angular TestBed tests. Happo’s project repository describes its package as an integration library and points readers to current documentation for comprehensive instructions. Before using any Angular-specific package command or claiming direct TestBed compatibility, confirm it in Happo’s current integration documentation. Avoid treating a generic setup example as proof of Angular support.
Troubleshoot common workflow problems
ng testruns a different runner than expected: inspect the Angular version andangular.jsontest target. New CLI projects and existing projects may have different runner setups.- A component looks right in tests but has no visual comparison: behavioral tests and Happo’s documented Storybook workflow are separate. Add the component state as a Storybook story and configure Happo to capture it.
- A screenshot diff appears noisy: compare the before and after views, check whether the change is intentional, and consider Happo’s documented tolerance option for insignificant image noise.
- You cannot find a verified Angular install command: consult Happo’s current Storybook documentation. The available documentation does not establish Angular-specific package versions or a direct TestBed adapter.
- You want to test an interaction-dependent state: make that state reachable in the story, using Happo’s described interaction-driven captures where appropriate. Keep a component test for the behavior itself.
Or skip the browser setup
If you need a standalone website screenshot rather than a Storybook visual-regression workflow, ScreenshotNeo is a screenshot API and MCP server for developers. A single GET request can return an image or PDF; it is not a replacement for Angular component tests or Happo’s story-based comparisons.
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See the ScreenshotNeo API documentation for request options. Cookie banners, popups, and chat widgets are removed before capture; bot checks, blank pages, and failed loads are never billed. Its MCP server lets AI agents take screenshots. The free plan includes 1,000 screenshots a month with no card, and paid plans start at $5 for 3,000. Sign up for ScreenshotNeo free.
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