Use Cypress Component Testing to mount an Angular component in a real browser, provide the inputs and dependencies it needs, then interact with its rendered UI and assert what a user can see. First confirm your Angular version is supported: Cypress’s current Angular overview lists Angular ^21.0.0 and ^22.0.0.
Check Angular compatibility and prerequisites
Cypress’s Angular overview currently lists support for Angular ^21.0.0 and ^22.0.0. These ranges are version-sensitive; check the current Cypress Angular overview before setting up a project on another Angular version.
- The Cypress Angular harness requires
@angular-devkit/build-angular, including in projects that use@angular/build. - As of Cypress 16, the harness supports zoneless testing without additional configuration or
zone.js. The overview notes that zoneless is the default in Angular 21 and 22.
Use Cypress’s official Angular Component Testing overview for the current compatibility and setup details. Its Component Testing setup starts a development server to compile and serve the specs; it does not visit your deployed production or staging application.
Install Cypress and configure Component Testing
-
From your Angular project directory, install Cypress as a development dependency:
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Open the Cypress app with
npx cypress open. -
Choose Component Testing. Cypress says its app detects an Angular CLI project and configures the component-testing setup. Follow the app’s prompts to select the browser and complete configuration.
-
Create a component spec, for example
stepper.component.cy.ts, alongside or in the spec location your project uses. Import the component using a path valid from that file.
The precise generated configuration depends on the project. Prefer the Angular configuration Cypress generates over copying a generic setup into every project: standalone components and NgModule-based components do not have identical dependency setup needs.
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Mount a component and test what it renders
A minimal Cypress component test imports the component and calls cy.mount():
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describe('StepperComponent', () => {
it('mounts', () => {
cy.mount(StepperComponent)
})
})Run the spec in the Cypress Component Testing runner. Cypress’s mount() API yields a wrapper that includes the component and its Angular fixture. Once mounted, select rendered elements, perform the same kinds of interactions a user would, and assert the resulting UI.
Cypress Documentation describes Component Testing as mounting components “directly in a real browser — not a simulated DOM.” That makes it useful for checking browser-rendered templates and interactions. It does not mean one component test replaces class-level tests or end-to-end tests; choose the test scope based on the behavior you need to verify.
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Provide inputs, providers, and imports
Set initial component properties
Pass values using the componentProperties mount option. This is useful when a component’s rendered state depends on an input or other property. For example, adapt the property name to the component:
cy.mount(StepperComponent, {
componentProperties: {
count: 3,
},
})For a legacy @Input() that the test needs to change after mounting, Cypress’s examples use fixture.componentRef.setInput(...). This lets Angular process the input change and run change detection correctly:
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cy.mount(StepperComponent).then(({ fixture }) => {
fixture.componentRef.setInput('count', 5)
fixture.detectChanges()
})Use the actual input name and the component’s expected value type. Then assert the changed, user-visible output rather than relying only on the internal property value.
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Supply collaborators where the component needs them
For components that depend on providers, declarations, or imports, configure the relevant mount options. The required setup depends on the Angular project style and the component’s dependencies; do not assume a single provider or module configuration fits every component.
Standalone components carry their imports in their own component metadata, so many can be mounted directly. Cypress’s examples note that mount options such as declarations and imports do not apply to standalone components in the same way they do to other component setups. If mounting fails because Angular cannot resolve a dependency, check the component’s metadata and provide the missing collaborator in the appropriate place.
Test outputs and signal-based inputs
Assert output events with a spy
Pass a Cypress spy as an output property, trigger the UI action that emits the event, and assert that the spy received the expected value. Cypress’s Angular examples also provide createOutputSpy() for this pattern.
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const changed = cy.spy().as('changed')
cy.mount(StepperComponent, {
componentProperties: {
changed,
},
})
cy.get('button').click()
cy.get('@changed').should('have.been.calledWith', 1)Replace changed, the button selector, and the expected value with the component’s actual output name and behavior. Prefer a selector and assertion that represent the interaction and result the user cares about.
Use writable signals when changing a bound value
Cypress’s examples cover Angular input and model signals. Plain values are suitable for initial values; if the test needs to change a bound value after mounting, use a writable signal so the test can update it. Match the signal type and binding to the component’s actual API rather than treating a signal like a legacy input property.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Choose the right testing layer
| Test scope | Environment | Best fit |
|---|---|---|
| Class-only test | No DOM is needed for the behavior being checked. | Validate logic that does not depend on template rendering or browser interaction. Angular notes these tests can be simpler for such behavior. |
| Cypress component test | A component mounted in a real browser. | Check rendered output, user interaction, and the component’s browser-visible behavior with its relevant dependencies. |
| End-to-end test | The larger application flow. | Check behavior that depends on integration across the application rather than a single mounted component. |
Angular’s testing guide describes a component as its template and class working together. DOM tests help verify rendering, responses to user input, and integration with parent and child components. For behavior that does not need a DOM, a class-only test may be enough. Use both component and broader application tests when their different scopes matter; component testing is not a substitute for every other test layer.
Troubleshoot common setup and test failures
- The project or component-testing setup is not detected: Confirm you opened Cypress from the Angular project directory and selected Component Testing. Check the current Cypress Angular overview for supported Angular versions.
- The Angular builder cannot be resolved: The Cypress Angular harness requires
@angular-devkit/build-angular, even when the project uses@angular/build. Check the project’s installed dependencies and build configuration. - A component fails to mount because an import or provider is missing: Review the component’s dependencies. Add the required providers or imports using the mount configuration appropriate to the project style; for a standalone component, first check its own metadata.
- An input change does not appear in the rendered UI: For a legacy
@Input()changed after mount, usefixture.componentRef.setInput()and allow Angular change detection to run. For a signal-based bound value that must change, use a writable signal. - An output assertion never fires: Check that the spy is passed to the actual output property, that the test triggers the action that emits it, and that the expected argument matches the emitted value.
- A zoneless setup expects
zone.js: Cypress 16 and later supports zoneless testing without extra configuration orzone.js; confirm the project and Cypress versions against the current Angular overview before changing project-wide settings.
Or skip the browser setup
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curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpScreenshotNeo accepts cookie and consent banners as a visitor and removes more than 60 known consent platforms, newsletter popups, and chat widgets before capture; each step can be turned off. Bot checks and CAPTCHAs, blank pages, timeouts, failed loads, and cache hits are not billed, and responses identify the page verdict and billing status in headers. Its MCP server provides take_screenshot, get_page_info, and capture_pdf tools for AI agents. The Free plan includes 1,000 screenshots a month with no card; paid plans start at $5 for 3,000.
Sign up for ScreenshotNeo’s free plan to try it without a card.
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