In Cypress Component Testing, inject a dependency through props when it is a normal component input; wrap the component in a provider when it reads React context. A shared custom cy.mount() command can apply recurring providers, accept test-specific values such as a router configuration or Redux store, and keep each test’s mutable state isolated.
Choose props or a provider based on how the component receives the dependency
| Approach | Use it when | Trade-off |
|---|---|---|
| Pass a dependency as a prop | The dependency is a normal component input, such as data, a callback, or a service function, and the component API reasonably exposes it. | Explicit and local to the test, but may add a prop to the component API. |
| Wrap the component in a provider | The component consumes React context or relies on app-level state, such as a router or Redux store. | Matches the context the component expects and avoids repeating setup, but the mount helper needs suitable options and isolated state. |
These are complementary seams, not competing rules: use the component’s ordinary inputs for props and supply context through the provider the component normally consumes. Cypress documents both approaches in its React component-testing examples.
Inject a simple service through props
When a component accepts a service function as a prop, supply a test implementation directly to the JSX passed to cy.mount(). A Cypress spy lets the test check that the component called the dependency with the expected input.
import { cy } from 'cypress'
import { UserLookup } from '../../src/UserLookup'
describe('UserLookup', () => {
it('passes the entered name to the lookup service', () => {
const lookupUser = cy.spy().as('lookupUser')
cy.mount(<UserLookup lookupUser={lookupUser} />)
cy.get('input').type('Ada')
cy.get('button').click()
cy.get('@lookupUser').should('have.been.calledWith', 'Ada')
})
})Adapt the component, selectors, and prop names to your application. If the service returns data that affects what is rendered, pass a test function with the return behavior your component expects and assert the resulting UI as well as any relevant call.
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Wrap context consumers in a custom mount command
For context-based dependencies, make a custom mount command that places the component under the required provider. The following TypeScript example illustrates a Redux pattern: it defaults to a newly created store and allows a test to supply a prepared store. Treat the code as illustrative; align the store factory, Cypress command typings, and mount option types with your application and installed Cypress version.
// cypress/support/component.tsx
import { mount } from 'cypress/react'
import { Provider } from 'react-redux'
import { makeStore } from '../../src/store'
Cypress.Commands.add('mount', (component, options = {}) => {
const { store = makeStore(), ...mountOptions } = options
return mount(<Provider store={store}>{component}</Provider>, mountOptions)
})Register the support file through your Cypress component-testing configuration, then use cy.mount(<YourComponent />) in component specs. Cypress’s mount command documentation describes the custom command pattern and provider wrappers; its React API reference documents the React mount function and options, including strict mode.
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Accept per-test provider settings
A shared helper can accept options for provider setup instead of hard-coding one value for every test. For example, Cypress’s React examples show patterns for router props and for supplying a prepared Redux store. This keeps common wrapping in one place while letting a test set the context state or configuration needed for its specific scenario.
Create mutable state separately for each test
Do not reuse a mutable Redux store across component tests. Create a fresh store for each test, typically by calling a store factory from the mount helper, or pass a newly created prepared store when a test needs explicit initial state. Otherwise, dispatches and other mutations from an earlier test can affect a later one.
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Run the component test in Cypress’s browser workflow
Cypress Component Testing mounts the component in a browser. Cypress’s component dev-server flow compiles the component spec and support files and serves them for the test run; it is intended for checking rendered UI and browser interactions. A dependency factory that contains no browser behavior can still be tested separately as ordinary unit logic. See Cypress’s React component-testing overview and component framework configuration guide for setup details.
The React overview lists React 18 and 19, with React/Vite, React/Webpack, and Next.js configurations. That page was marked last updated August 26, 2026; support and setup can change, so verify the current overview against your installed Cypress, React, and bundler versions before applying its compatibility details.
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Troubleshoot dependency-injection test failures
- A context consumer fails because context is missing: mount it under the provider it expects, either in the shared custom command or in a test-specific wrapper. Props do not populate React context.
- One test appears to inherit another test’s state: check whether a mutable provider value, especially a Redux store, is shared. Construct it per test or pass a fresh prepared store.
- A dependency spy has no recorded call: confirm the test exercised the UI path that invokes the dependency, that the component received the spy through the correct prop, and that the assertion uses the expected arguments.
- The custom mount command rejects options or has typing errors: match the helper’s option shape and Cypress command typings to the application’s types and the current React mount API. The example above is a pattern, not a complete application-specific typing declaration.
- The spec does not compile or the component server does not start: check the component framework and dev-server configuration for the project’s bundler and React setup, then compare it with Cypress’s current framework configuration guide.
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