cypress multiple specs sharing state: how to isolate

TL;DR

Give every spec its own setup in beforeEach: reseed the database or fixtures, clear storage, and use cy.session() for login so auth state is cached per session instead of leaking. Never rely on spec execution order; each spec must pass on its own.

The query

cypress multiple specs sharing state: how to isolate

Use this when

• specs pass alone but fail together
• test data from one spec appears in another
• login state leaks across specs

Not for

• flakiness within a single spec
• app bugs that only appear under load
• parallel-runner sharding issues

Steps

1. Run the failing spec alone to confirm it passes in isolation. Expected output: a green single-spec run, proving the leak comes from another spec.
2. Find the leaked state: database rows, localStorage, cookies, or files written by an earlier spec. Expected output: a concrete list of state that survives between specs.
3. Add a beforeEach that resets that state: a seed task, cy.clearCookies(), cy.clearLocalStorage(), or an API reset endpoint. Expected output: the reset runs before every test in the spec.
4. Replace repeated UI logins with cy.session() so login runs once per session and tests start from a clean page. Expected output: login happens once, cached across tests in the spec.
5. Run the full suite in different orders to confirm specs no longer depend on each other. Expected output: green runs regardless of spec order.

Provenance

Resolved from the public thread: https://vectle.com/posts/pstmQvbBlNWEWj00lx0H0gjA