A Cypress test is an automated specification that opens an application in a browser (or mounts a component in one), performs actions, and checks the resulting behavior with assertions. Cypress places those commands on an asynchronous command queue, runs them in order, and automatically retries linked queries and assertions while the application is still rendering. It is not Selenium, its commands are not awaitable Promises, and its optional test retries are different from the normal command-retry mechanism.
What a Cypress test is
Most Cypress tests are written in JavaScript or TypeScript. A test describes a behavior a user or an API client should observe, so the file acts as an executable specification rather than a collection of low-level browser instructions.
describe('checkout', () => {
it('submits a valid order', () => {
cy.visit('/checkout')
cy.get('[data-cy=email]').type('sam@example.com')
cy.get('[data-cy=submit]').click()
cy.get('[data-cy=confirmation]')
.should('be.visible')
.and('contain', 'Order received')
})
})The example visits a page, finds an input, types into it, clicks a button, and verifies the confirmation. Cypress can run this as an end-to-end test against a local or deployed application. It can also mount an individual UI component in a real browser for component testing, call an API directly with cy.request(), and control network traffic with interception and stubbing.
How Cypress executes commands
Cypress coordinates a browser-side runner with a Node server process and executes close to the application in the same run loop. Commands are placed into a central asynchronous queue and are executed serially; writing a command does not execute it immediately.
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The queue is not a Promise chain
Cypress states that “Cypress commands are not Promises and cannot be awaited.” Do not write const value = await cy.get(...). Instead, place dependent work in a .then() callback or make the next Cypress command consume the yielded subject.
cy.get('[data-cy=total]').invoke('text').then((text) => {
expect(text).to.match(/$[0-9]/)
})
// Keep the value in the Cypress chain when possible:
cy.get('[data-cy=total]').should('contain', '$')A Cypress command may yield a subject to the next command, but that subject is not returned synchronously to the surrounding JavaScript function. Mixing ordinary Promises and Cypress commands without understanding this scheduling is a common source of confusing results.
A typical end-to-end sequence
cy.visit()loads the application URL.cy.get()orcy.contains()queries the DOM.- An action such as
.type()or.click()changes application state. .should()or another assertion checks the resulting UI.
Cypress performs actionability checks before an action: the element must be in a usable state according to Cypress’s rules. Once the action executes, Cypress does not repeat a state-changing click merely because a later assertion fails; repeating it could submit a form or trigger another side effect.
Does Cypress wait automatically?
Yes, but the precise behavior matters. Cypress automatically retries linked queries and assertions. In this chain, Cypress repeatedly re-queries the button and evaluates the assertion until it passes or the timeout expires:
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.should('be.visible')
.and('not.be.disabled')The retry starts from the beginning of the linked query/assertion chain, allowing a framework-rendered element or updated text to appear without a hard-coded sleep. The documented default command timeout is 4 seconds. You can override one command:
cy.get('[data-cy=report]', { timeout: 10000 })
.should('contain', 'Complete')You can configure a global timeout, but Cypress’s retry guidance favors changing the individual command when only one operation is slow. A fixed cy.wait(5000) can make a suite slower and still fail if the application needs longer; prefer an assertion on the state that proves the work finished.
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What is not retried
Actions such as click() and type() are checked for actionability and then run once. If an action starts a request, wait for a meaningful UI result or intercept the request and assert on it rather than expecting Cypress to click again.
Command retry-ability versus test retries
These are separate features.
| Mechanism | Purpose | What runs again |
|---|---|---|
| Command retry-ability | Handles expected asynchronous rendering and state changes | Linked queries and assertions, until they pass or the command timeout is reached |
| Whole-test retries | Provides another attempt after a test fails | The test attempt, including its hooks |
With retries: 2, Cypress permits one initial attempt plus two additional attempts (up to three total). beforeEach and afterEach run again for each attempt. Test retries can expose intermittent failures, but they do not repair a test that depends on a previous test’s state or uses an incorrect assertion.
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const { defineConfig } = require('cypress')
module.exports = defineConfig({
retries: 2,
e2e: {
baseUrl: 'http://localhost:3000'
}
})End-to-end, component and API tests
End-to-end tests
Use an end-to-end test for a user-visible workflow: sign in, create a record, submit a form, or navigate between pages. It exercises the running application and its integration points.
Component tests
A component test mounts a component directly in a real browser. It is useful for checking rendered behavior, styles, and interactive states without navigating through the whole application.
import Button from './Button.jsx'
describe('<Button />', () => {
it('emits a click', () => {
const onClick = cy.stub().as('onClick')
cy.mount(<Button onClick={onClick}>Save</Button>)
cy.contains('Save').click()
cy.get('@onClick').should('have.been.calledOnce')
})
})API tests with cy.request()
cy.request() calls a REST or GraphQL endpoint directly and lets you assert status, headers, body, and timing. It is also useful for seeding data before a UI flow.
it('creates an invoice through the API', () => {
cy.request('POST', '/api/invoices', { amount: 2500 })
.then((response) => {
expect(response.status).to.eq(201)
expect(response.body).to.have.property('id')
})
})Network interception
Cypress supports request interception and stubbing. Documentation describes native network interception for Chrome, Chromium, and Edge beginning with Cypress 16; because this is version-specific, verify the behavior against the release documentation for the Cypress version installed in your project.
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Isolation, browsers and repeatability
End-to-end test isolation is enabled by default. Before each test Cypress resets aliases, clock mocks, intercepts, spies, stubs, and viewport changes, and starts from a clean browser context. A test should therefore create its own data and setup rather than relying on a preceding test.
Cypress launches its own browser instance and isolated profile; it does not attach to your personal browser session. Current documentation lists Chrome-family browsers, Firefox, and experimental WebKit. The selected browser must be installed locally or in CI.
Why independent tests matter
- A test can run alone and still establish all required state.
- Failures identify the behavior under test instead of an earlier test’s leftovers.
- Parallel CI runs are less likely to collide through shared browser state.
Authoring and debugging with cypress open
Run cypress open to launch the interactive runner. It opens tests in a real browser, watches relevant files, reruns the active spec after edits, and shows each command in a time-travel-style UI. Selecting a command lets you inspect the application and the state Cypress observed at that point.
npx cypress openFor an automated run, use the headless runner and choose a browser installed in the environment:
npx cypress run --browser chromeKeep selectors stable with attributes intended for testing, such as data-cy, instead of coupling tests to presentation classes. Assert user-observable outcomes, not implementation details that can change during a refactor.
Common failures and precise fixes
“Timed out retrying”
Cause: The linked query or assertion never reached its expected state within the timeout. Fix: Confirm the selector, verify that the test loaded the intended URL, wait on a state-changing request or visible result, and increase the timeout only for the genuinely slow command.
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“Cannot await a Cypress command”
Cause: A command was treated as a native Promise. Fix: Remove await and continue the Cypress chain or use .then() for dependent JavaScript.
A click appears to do nothing
Cause: The element is covered, disabled, detached, or otherwise fails actionability checks. Fix: Assert visibility and enabled state, wait for the covering UI to disappear, and target the element that a user would actually click. Do not add repeated clicks to mask a state problem.
Tests pass only in a sequence
Cause: Hidden dependence on state left by an earlier test. Fix: Run the spec or test alone, move setup into the test or its hooks, and use API setup where it is faster and clearer.
Browser or CI launch errors
Cause: The requested browser is not installed or the CI environment cannot launch it. Fix: Install the selected Chrome-family browser, Firefox, or supported experimental WebKit build in the environment, then run Cypress with that browser name.
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Reliable Cypress suites minimize unnecessary page visits, use API calls to seed predictable data, and replace arbitrary sleeps with assertions. Keep tests independent so they can be selected, rerun, or distributed by CI without ordering assumptions.
Cypress Cloud is the adjacent service for recording CI results, replaying tests, parallelizing runs, prioritizing specs, and auto-canceling runs. Those capabilities are separate from Cypress’s local command queue and browser execution.
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FAQ
Does Cypress use Selenium?
No. Cypress uses its own browser-side runner coordinated with Node rather than Selenium/WebDriver’s remote-command model.
Can Cypress test APIs?
Yes. Use cy.request() to call REST or GraphQL endpoints and assert the response, or seed state before a UI test.
What is the default Cypress command timeout?
The documented default is 4 seconds; override a slow command locally when possible.
Can a Cypress test run in my everyday browser profile?
No. Cypress launches its own browser instance and isolated profile.
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