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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchReliable Cypress tests are independent, use selectors that survive styling changes, and wait for observable application state instead of guessed delays. Start each test with explicit setup, let Cypress retry queries and assertions, and treat any pass-on-retry as a clue to investigate—not proof that a flaky test is fixed.
Build tests that pass on their own
Make each test establish the state it needs, exercise one behavior, and assert the result. A test that only passes after another test has run is vulnerable to order changes and can give misleading results. Cypress recommends that tests run independently: Writing and organizing Cypress tests and Cypress best practices.
Between tests, Cypress resets aliases, clock mocks, intercepts, spies, stubs, and viewport changes. For end-to-end tests with the default testIsolation: true, it also visits about:blank and clears cookies, localStorage, and sessionStorage. That does not clear IndexedDB or every other possible storage mechanism, so applications that use those stores may need explicit cleanup or setup. See Test isolation in Cypress.
Set up required state deliberately
Use a test’s setup to create or select the data it needs, rather than relying on a prior test’s side effects. If repeated UI login is unnecessary, consider cy.session() or programmatic setup while keeping the required session state explicit. Disabling end-to-end isolation with testIsolation: false may reduce setup work, but it permits state leakage; first check that tests pass individually and in a different order.
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Component tests are different
Cypress component tests reset the rendered component and the named browser stores described in the isolation documentation. The testIsolation configuration is not supported for component testing, so do not assume the end-to-end setting controls component-test isolation.
Choose selectors for meaning, not appearance
For elements used as test targets, prefer dedicated attributes such as data-cy. They are separate from styling and application behavior, so a CSS redesign is less likely to break the test. Avoid generic tags and styling classes as the only locator when those details are incidental. Cypress explains its selector guidance in Cypress best practices.
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Use text when text is the behavior
A text selector is appropriate when the test is meant to verify user-visible wording—for example, that a button says “Save changes.” If the test only needs to click the button, a stable test attribute is less coupled to copy changes.
Teams that want a guardrail can use the cypress/require-data-selectors rule from eslint-plugin-cypress to enforce data attributes where appropriate.
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Synchronize on application state, not a guessed sleep
Cypress retries linked queries and assertions while waiting for an asynchronous interface to reach the expected state. A fixed delay such as cy.wait(2000) does not know whether the page is ready: it can waste time when the app responds quickly and still fail when it responds more slowly. Prefer a query followed by an assertion that describes the state the test needs. See Retry-ability in Cypress.
Keep the query/action/assertion boundary clear
Queries and their linked assertions can retry; actions such as .click() run once. Put an action at the end of its query chain, then start a fresh query to check its effect. This avoids assuming that Cypress will safely repeat a state-changing action.
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cy.get('[data-cy="submit"]').click();
cy.get('[data-cy="confirmation"]').should('be.visible');The first query finds the intended control, the click happens once, and the next query retries while checking for the resulting confirmation. Choose assertions that represent the actual condition needed by the next step rather than adding an arbitrary pause. Cypress also cautions against relying on conditional testing when the application’s state is not known deterministically; see Conditional testing in Cypress.
Use test retries as a diagnostic signal
Cypress test retries are off by default. Enabling them can help expose intermittent failures or reduce disruption from transient problems, but a test that passes only on a retry has demonstrated instability. Track retry-pass tests and investigate race conditions, uncontrolled state, or dependencies that behave differently across runs. Retries add execution time and should not be treated as a substitute for correcting the cause. See Test retries in Cypress.
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Make CI wait until the app is ready
A CI job should start the application server and confirm it responds before Cypress begins. Launching Cypress immediately after a background server command introduces a startup race; replacing that race with a fixed sleep is still unreliable. The Cypress continuous integration guide documents the GitHub Action’s start and wait-on options, which can start the server and wait without extra packages when that workflow fits your setup.
Investigate failures with evidence
When a failure persists, review available screenshots, video, or Test Replay, then reduce the problem to a smaller reproducer. Compare local and CI behavior and, where relevant, browser-specific results. Cypress’s troubleshooting guide covers these investigation paths.
Common reliability problems and fixes
| Symptom | Likely cause | Practical fix |
|---|---|---|
| A test passes only after another test | Shared state or order dependency. | Run it alone, establish its data and session in its own setup, and inspect storage that Cypress does not clear, including IndexedDB. |
| A selector breaks after a visual redesign | The locator depends on a styling class or generic markup. | Use a dedicated data-cy attribute; use visible text only when the wording itself matters. |
| An element is intermittently missing | The test assumes the UI is ready after a fixed delay or does not assert the required state. | Query the element and assert the needed condition so Cypress can retry the query/assertion chain. |
| A failure disappears on retry | An intermittent race, unstable dependency, or uncontrolled state may be present. | Keep the retry-pass visible in tracking and investigate the first failure rather than treating the later pass as clean evidence. |
| CI fails before the page loads | Cypress starts before the background server is ready. | Use an explicit readiness check, such as the Cypress GitHub Action’s start and wait-on options, instead of a fixed sleep. |
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