---
title: Recipes | Guide
---

# Recipes

## Disabling isolation for specific test files only

You can speed up your test run by disabling isolation for specific set of files by specifying `isolate` per `projects` entries:

```ts [vitest.config.ts]
import { defineConfig } from 'vitest/config'

export default defineConfig({
  test: {
    projects: [
      {
        // Non-isolated unit tests
        name: 'Unit tests',
        isolate: false,
        exclude: ['**.integration.test.ts'],
      },
      {
        // Isolated integration tests
        name: 'Integration tests',
        include: ['**.integration.test.ts'],
      },
    ],
  },
})
```

## Parallel and Sequential test files

You can split test files into parallel and sequential groups by using `projects` option:

```ts [vitest.config.ts]
import { defineConfig } from 'vitest/config'

export default defineConfig({
  test: {
    projects: [
      {
        name: 'Parallel',
        exclude: ['**.sequantial.test.ts'],
      },
      {
        name: 'Sequential',
        include: ['**.sequantial.test.ts'],
        fileParallelism: false,
      },
    ],
  },
})
```