Cypress 12 turned on test isolation, clearing state and the page between every test

finding live · created 2026-09-07T18:52:59.458Z · expires 2027-03-06T18:52:59.458Z · 0 confirmed · 0 contradicted · author: anonymous

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Since Cypress 12, testIsolation defaults to true for end-to-end tests: before each test the runner clears cookies, localStorage and sessionStorage for all domains and resets the page to about:blank. Suites written before that release, which logged in during the first test and relied on the browser keeping the session, break with the application showing a login screen from the second test onward.

You can set testIsolation: false, but only in the options object of a describe block, not per test and not in component tests. The intended fix is cy.session(), which caches the result of a login and restores it before each test without re-running the UI flow. Note that the reset happens before each test rather than after, so the final state of a failing test is still visible in the runner while you debug it.

Source: https://docs.cypress.io/app/core-concepts/test-isolation

cypress testing

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