If a Cypress test passes only after another test, breaks when CSS changes, or stays flaky despite a fixed sleep, look for hidden dependencies rather than adding more waiting. Cypress’s documented anti-patterns point to a common remedy: make setup deliberate, synchronization condition-based, and tests independent. The examples below follow Cypress’s current guidance; a documented anti-pattern is a useful diagnostic clue, not proof that it caused a particular failure.
1. Making one test depend on another
A test should pass on its own and in any order. If a preceding test leaves behind a logged-in session, record, or page state that the next test silently needs, the latter can fail when run alone, reordered, or selected for a focused run.
Cypress states that “Tests should always be able to be run independently from one another and still pass.” Its test isolation guidance explains the default behavior for end-to-end tests: before each test, Cypress resets the page to about:blank, clears cookies across domains, and clears localStorage and sessionStorage. It does not clear IndexedDB or every other browser storage mechanism.
How to find and fix the dependency
- Run a failing test by itself, including with
.only(), as Cypress recommends when investigating test coupling. - Give each test the setup it requires. Move genuinely common setup into a hook, but do not make one test responsible for another test’s prerequisites.
- Organize specs around features and user flows so a test’s setup and assertions reflect the behavior being checked.
Component tests reset the rendered component and the same listed cookie and storage categories. Cypress says component testing does not support configuring test isolation behavior.
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2. Turning off isolation as a blanket speed fix
Setting testIsolation: false for an end-to-end suite or describe block can retain browser state and may improve performance in a particular suite. It also allows tests to affect one another, which can hide dependencies and create order-sensitive failures. Treat it as a workload-specific trade-off, not a default optimization.
If you consider disabling isolation, first run each test alone and confirm that it establishes the state it needs. Cypress notes that cy.session() follows the test-isolation configuration; with isolation enabled, visit the application after setting up or restoring a session when the test needs a page. See the isolation documentation for configuration details and behavior.
3. Selecting elements through volatile styling
Selectors based on CSS classes, presentation-oriented IDs, or incidental markup can break when the interface is restyled or refactored, even if the user-visible behavior is unchanged. Cypress recommends dedicated data-* attributes for test targeting, such as [data-cy="submit"].
Prefer a selector that expresses test intent
// Fragile if the class is only for styling
cy.get('.btn-primary').click()
// A purpose-built test hook
cy.get('[data-cy="submit"]').click()A data attribute is not mandatory for every query. Text can be the right choice when the test is checking what a user sees; semantic attributes can be suitable when they express meaningful HTML behavior. The goal is to avoid coupling a test to implementation details that are likely to change. Cypress’s best-practices guidance shows its selector recommendations.
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4. Using fixed sleeps instead of waiting for a condition
A command such as cy.wait(3000) guesses how long work will take. If the application is ready sooner, the test wastes time; if it is slower, the sleep does not make the required condition true. Cypress calls arbitrary waits an anti-pattern and says, “You almost never need to wait for an arbitrary period of time.”
For UI state, assert the state you need
Cypress retries queries and assertions, so express the expected condition directly:
cy.get('[data-cy="results"]').should('be.visible')This waits for the result element to satisfy the assertion or for Cypress’s command timeout to be reached. It does not assume that a particular number of milliseconds guarantees readiness.
For a specific request, alias and wait for it
cy.intercept('GET', '/api/items').as('getItems')
cy.visit('/items')
cy.wait('@getItems')
cy.get('[data-cy="results"]').should('be.visible')Use the route pattern that matches the application’s request. Waiting for the aliased request synchronizes with that network event; assert on the resulting UI as well when the behavior under test includes rendering.
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cy.visit() resolves when the page’s load event fires, and cy.request() resolves when its response arrives. An extra sleep after either is generally unnecessary. Consult the official cy.wait() API documentation for the distinction between fixed waits and waiting on an alias.
Do not guess at server startup time in CI
Starting cypress run concurrently with a server boot does not guarantee the server is ready when tests begin. Use a readiness check or a CI action that waits for the server, rather than adding a guessed sleep. Cypress describes this startup race in its continuous integration guidance.
5. Repeating UI login and leaving application state to chance
When login is setup rather than the behavior under test, Cypress recommends programmatic login where appropriate. Establish authentication and other necessary state deliberately instead of replaying a lengthy UI flow in every test. Keep the UI login flow in tests that actually verify login behavior.
The right setup depends on the application’s authentication and test environment; Cypress’s guidance does not prescribe one backend-specific login recipe. If a test needs an authenticated page and uses cy.session(), account for the interaction between sessions and isolation described above.
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6. Depending on sites your team does not control
Visiting or interacting with an uncontrolled third-party site makes a test depend on systems outside the application under test. Changes, availability, or behavior at that site can affect the run. Cypress recommends avoiding this pattern; where appropriate, use a third-party API through cy.request() instead. Choose a strategy suited to the dependency and the behavior the test is meant to verify—do not mistake an external-site check for a controlled application test.
7. Sharing page objects when they obscure the flow
Cypress lists sharing page objects among discouraged patterns and recommends organizing tests around features and user flows rather than mirroring page structure. The concern is that an abstraction can make a test’s intent or state dependencies harder to see. This is Cypress’s guidance, not a rule that every helper or abstraction is harmful: keep shared code when it makes behavior clearer and does not conceal setup or coupling.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.8. Writing only one assertion per end-to-end test
Cypress identifies the “single assertion end-to-end only” approach as an anti-pattern. A user flow can have several related assertions about one outcome, and there is no need to split each assertion into a separate browser journey merely to keep the count at one.
Keep assertions relevant to the behavior under test. The opposite extreme—combining unrelated behaviors into one long scenario—also makes failures harder to interpret. Group related checks around a feature or user flow.
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9. Hard-coding secrets in test files
Do not put credentials, tokens, or other secrets directly in test source or expose sensitive values to the browser context. Use a secret-handling mechanism appropriate to your local and CI environments. A test-only environment does not make an exposed secret safe.
10. Repeating application URLs instead of setting baseUrl
Cypress identifies calling cy.visit() without configuring baseUrl as an anti-pattern. Set the application’s base URL in Cypress configuration, then visit paths relative to it:
// cypress.config.js
const { defineConfig } = require('cypress')
module.exports = defineConfig({
e2e: {
baseUrl: 'http://localhost:3000'
}
})
// In a spec
cy.visit('/login')This avoids repeating a fully qualified local URL and makes it easier to switch application environments. Cypress also notes that configuring the base URL can avoid an initial reload as the runner changes from its startup URL to the application URL.
Diagnose a flaky Cypress test by its symptom
| What you see | Likely pattern to inspect | Better next step |
|---|---|---|
| Passes in the full suite but fails alone or after reordering | Hidden state dependency between tests | Run the test alone; make its setup explicit and preserve isolation unless there is a justified suite-level reason not to. |
| Breaks after a CSS or markup change without a user-facing behavior change | Selector tied to styling or incidental structure | Use a purpose-built data-* hook, or query user-visible text/semantics when those are what the test verifies. |
| Slow suite, yet occasional timing failures remain | Fixed-duration waits | Assert on the UI condition or wait for a specific aliased request. |
| Fails intermittently at the start of a CI run | Tests may start before the app server is ready | Add an explicit readiness check or use a CI wait action. |
| Unpredictable failures during an external-site interaction | Dependency on a site outside the team’s control | Test the application boundary and use a suitable API strategy for third-party behavior where appropriate. |
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Further Cypress learning
Cypress offers free official courses and examples through Real World Testing with Cypress.
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