Fixture Scopes, Overrides & Object Syntax in Vitest
From the Vitest cheat sheet · Test Context & Fixtures · verified Nov 2026
Fixture Scopes, Overrides & Object Syntax
Share fixtures per file or worker, override them per suite, or use the Playwright-style object API
typescript
const test = base
.extend('port', { scope: 'worker' }, 5432) // per worker
.extend('db', { scope: 'file' }, ({ port }) => connect(port)) // per file
.extend('role', 'viewer') // per test
describe('admins', () => {
test.override({ role: 'admin' }) // this suite only
})🔍 Scopes are test (default), file and worker; wider ones are shared
📌 test.override must be called at the top of a describe block
🎭 The object syntax matches Playwright fixtures; see the Playwright sheet
⚠️ In non-isolated runs a worker fixture override leaks to later files
fixturesscopetest.override
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