Do these 3 things before closing this tab:
1Scan for outdated or missing drivers - takes under a minute2Repair Windows errors before they cause bigger problems3Fix the driver behind crashes, sound loss and screen glitchesUse Cypress Component Testing to mount an individual React component in a real browser, provide the props and dependencies it needs, and assert its rendered output or interactions. Configure Cypress’s component dev server for Next.js with framework: 'next' and bundler: 'webpack'. Use end-to-end tests instead when the behavior depends on a complete Next.js page or server-only page methods such as getServerSideProps or getStaticProps.
Check Next.js and Cypress compatibility first
Cypress’s React Component Testing documentation lists Next.js 15 and 16 as supported. The compatibility floor depends on the Cypress release: as of Cypress 16.0.0, component testing requires Next.js 15.0.4 or newer, or Next.js 16. Next.js 14 is not supported by that Cypress release. Check the migration guidance for your installed Cypress version before configuring the project; do not assume a version requirement for Cypress 16 applies unchanged to every earlier release.
The compatibility statement is about Cypress component testing with Next.js; it does not mean every page-level Next.js feature runs inside a component test.
Set up Cypress component testing for Next.js
- Open Cypress’s component-testing setup flow. Cypress’s Launchpad detects the framework and bundler during setup and can scaffold the configuration.
- Verify the component dev-server settings. In
cypress.config.jsorcypress.config.ts, configure the component dev server for Next.js and Webpack. The documented configuration is:import { defineConfig } from 'cypress' export default defineConfig({ component: { devServer: { framework: 'next', bundler: 'webpack', }, }, }) - Use the project’s component support setup. Follow the setup Cypress generates for the project and ensure the component test environment makes
cy.mount()available. If your app needs context providers or other setup, arrange for the mounted component to receive them; a component test does not automatically recreate the whole Next.js application runtime. - Open the component-testing runner and run a spec. Cypress starts a development server to compile and serve component specs. Tests mount in a browser through this configured server; they do not run against the production site. The server shuts down when the Cypress app closes or a run finishes.
See Cypress’s component framework configuration and component-testing setup guide for the setup flow and configuration details.
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Write a first mount-and-assert test
Import the component, mount it with the input values the test needs, then assert what the browser renders. This illustrative example follows Cypress’s documented React mount-and-assert pattern; adapt the import and selector to your application.
import { Stepper } from './stepper'
describe('Stepper', () => {
it('renders its initial count', () => {
cy.mount(<Stepper initial={2} />)
cy.get('[data-cy=counter]').should('have.text', '2')
})
})The test asks a narrow question: when Stepper receives initial={2}, does the element identified by data-cy="counter" display 2? Choose stable selectors for your own components and add assertions for the UI behavior that matters, such as the result of a user interaction. Cypress mounts the JSX in a real browser, rather than a simulated DOM. See the official React examples.
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If the component reads context, uses a provider, or depends on application-specific initialization, supply that dependency in the test harness or mount setup. The test should represent the component inputs and dependencies it actually needs, not assume that mounting one component recreates the full app.
Load global styles in component tests
For the documented Next.js styling setup, the component index HTML needs a CSS injection marker in its <head>:
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<div id="__next_css__DO_NOT_USE__"></div>Import the application’s global stylesheet from the component support file, commonly cypress/support/component.js. Use the stylesheet path that exists in your project; this example path is not universal.
import '../../src/index.css'If global styles are missing or mounting fails while setting up styles, verify both that the marker is present in the component index HTML and that the stylesheet import points to the right file. Cypress documents this setup in Test your component’s styles.
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Choose component testing or end-to-end testing by behavior
| Test type | What it exercises | Best fit |
|---|---|---|
| Component testing | An individual component mounted in Cypress’s component dev server, with the props and dependencies you supply. | Isolated UI output and interactions. |
| End-to-end testing | A page or flow exercised through the application, including server-side page behavior. | Next.js pages whose behavior depends on server execution or page-level integration. |
In particular, getServerSideProps and getStaticProps run on the server; they do not run in a component test. A page that depends on those methods can therefore receive undefined props when tested as a component. Cypress’s React Component Testing documentation recommends: “Because of this, we recommend using E2E Testing over Component Testing for Next.js pages and Component Testing for individual components in a Next.js app.” Treat a component test as evidence about the mounted component, not validation of server-rendered behavior.
Troubleshoot common setup and test failures
- The Next.js project is outside the documented compatibility range. Check both the installed Cypress release and the Next.js version. For Cypress 16, use Next.js 15.0.4 or newer, or Next.js 16; consult the matching Cypress migration guide if using another release.
- The component dev server does not start with the expected framework. Check the component section of
cypress.config.jsorcypress.config.tsforframework: 'next'andbundler: 'webpack'. Revisit the Launchpad-generated setup and the configuration guide. cy.mount()is unavailable or the component lacks app context. Check the project’s component support setup and make sure the test harness supplies any provider or context dependency the component uses.- Global CSS is absent or mounting fails after adding styles. Confirm the Next.js CSS injection marker is in the component index HTML’s head and the component support file imports the correct global stylesheet.
- A page test has missing or undefined props. If the page relies on
getServerSidePropsorgetStaticProps, switch that test to end-to-end coverage. Those server-only methods do not execute during component testing. - An assertion fails despite a successful mount. Verify the test passes the expected props, that its selector matches the rendered component, and that the assertion reflects the component’s actual visible output. A component test only covers the mounted inputs and dependencies provided to it.
Or skip the browser setup
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