To test a Vue.js app with Cypress, choose whether you need to mount one component in a real browser or exercise the running app end to end. For a focused component test, install Cypress, configure its Vue component runner with your project’s bundler, register cy.mount(), then mount the component and assert on what a user sees and does.
Choose component testing or end-to-end testing
| Approach | What runs | Best fit |
|---|---|---|
| Component Testing | An individual Vue component mounted directly in a real browser within Cypress’s test environment. | Check how a component renders, responds to props, and reacts to user actions. |
| End-to-end (E2E) testing | The application as a whole in a browser. | Check a user journey that depends on startup, routing, or integration across features. |
Cypress describes Component Testing as mounting components directly in a real browser rather than a simulated DOM. The two approaches answer different questions; a focused component test does not establish that the entire application workflow works, and an E2E test is not a substitute for every isolated component check. Cypress component testing overview · Cypress testing types.
Check Vue and bundler compatibility
As of October 2026, Cypress’s Vue component testing documentation describes support for Vue 3+ projects using Vite 8.x or Webpack 5+. These compatibility details can change; check the current Vue component testing guide against your project before configuring the runner.
The component dev server compiles spec and support files with the app’s development transforms and serves them to Cypress. Consequently, bundler configuration—including aliases and CSS transforms—can affect whether a component mounts successfully. See Cypress component framework configuration.
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Install Cypress and configure Vue Component Testing
-
Add Cypress as a development dependency using your package manager. For npm, run
npm install --save-dev cypress. -
Open the Cypress app with
npx cypress open. In the Launchpad, choose Component Testing and follow its setup flow. Cypress’s getting-started guide covers the setup: Get started with component testing. -
Choose Vue as the framework and the bundler used by the project, Vite or Webpack. The component configuration identifies these with
framework: 'vue'and the relevant bundler configuration. Keep the test bundler settings aligned with the app’s actual transforms and aliases. -
Confirm that the generated component support and spec files are included in the configuration Cypress creates. Put reusable mount setup in the component support file; write component specs in the component test location configured for the project.
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The exact generated file paths can vary with the project and Cypress setup, so use the paths shown by your Launchpad configuration rather than assuming a particular directory layout.
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Register and use cy.mount()
Cypress exports Vue’s mount helper from cypress/vue. In the component support file, expose it as a Cypress command:
import { mount } from 'cypress/vue'
Cypress.Commands.add('mount', mount)With TypeScript, Cypress may need a command type declaration matching the version and setup in use. Follow the current Vue API documentation for the supported declaration pattern.
A first test can mount a component, locate its visible control, interact with it, and assert on an observable result. For example, with a Stepper.vue component that accepts a starting value prop and emits change with the updated value:
import Stepper from './Stepper.vue'
describe('Stepper', () => {
it('emits the updated value when the user increments', () => {
const onChange = cy.spy().as('onChange')
cy.mount(Stepper, {
props: {
value: 3,
onChange,
},
})
cy.contains('button', 'Increment').click()
cy.get('@onChange').should('have.been.calledWith', 4)
})
})This pattern checks the component’s public behavior: initialize it through a prop, perform a user action, and verify the event value. Cypress’s Vue examples use this style of prop, click, and spy assertion. Adapt the event prop and accessible query to the component’s actual API and rendered labels.
Provide the app setup a component needs
A component mounted by itself does not automatically inherit every plugin, global component, or parent wrapper registered by the application. Add only the setup that the component under test requires. If many tests need the same setup, customize the shared mount command rather than repeating registrations in every test.
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Pinia, Vue I18n, and global components
Register required plugins and global components through the mount options or a customized mount command. Cypress’s Vue examples cover Pinia, Vue I18n, and global components; use the current examples to match the options supported by your Cypress and Vue versions.
Vue Router
When a component depends on router context, create a router for the test and install it when mounting. Cypress’s example uses memory history, avoiding dependence on a real browser navigation session. The test should provide the routes and initial location needed for the component’s behavior.
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Vuex
For a Vuex-dependent component, create and register a store as part of test setup. Cypress notes that initializing a store per test avoids state changes leaking from one test into another.
Vuetify and required wrappers
Some UI frameworks expect components to sit inside a particular application hierarchy. Cypress’s Vuetify example wraps the mounted component in VApp; provide equivalent required wrappers for your own framework or component.
Nuxt
Cypress’s Vue component integration does not consume nuxt.config and has no dedicated Nuxt framework definition. For Nuxt 3+ component tests, configure the Vue/Vite component path directly. Nuxt aliases such as ~ and @, auto-imports, and plugins are not automatically available when mounting a component alone; add the needed aliases, imports, or plugin setup explicitly. Details are in the Cypress Vue overview.
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Write assertions around user-visible behavior
-
Pass props or mount options to represent the state the component should handle.
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Query the rendered interface using a label, role, or visible text that reflects how a user would find the control.
-
Perform the interaction that matters, such as clicking a button.
-
Assert on a result the user or another part of the application can observe: changed text, an enabled control, navigation state, or an emitted event.
A passing isolated component test demonstrates that behavior under the setup and state supplied to the test. It does not by itself verify that the full application starts correctly or that all integrated features work together; use an E2E test when that broader path is the claim.
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Troubleshoot common component-test failures
The component cannot be imported or mounted
Check that the Cypress component configuration uses Vue and the same bundler family as the app, and that the project meets the documented Vue and bundler compatibility. Also inspect bundler aliases and transforms: component specs and support files are compiled by the component dev server, so an app-only transform may not be applied automatically.
A plugin or global component is missing
Mount the component with the plugin or global registration it relies on, or add that setup to a shared mount command. If the component expects an application wrapper, reproduce that hierarchy in the test.
A Nuxt alias or auto-import is unresolved
Do not expect Cypress to read nuxt.config or provide Nuxt auto-imports in a standalone component test. Configure the needed alias or explicitly import and register the dependency in the component-test setup.
Tests affect one another through store state
Create a fresh store for each test when testing Vuex state. Apply the same isolation principle to other mutable test setup so one case does not depend on a previous test’s changes.
The event assertion never fires
Verify that the component actually emits the event prop used in the test, that the test passes the spy under the correct prop name, and that the click targets the intended rendered control. Assert the emitted value that the component contract promises.
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