---
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: [
      {
        test: {
          // Non-isolated unit tests
          name: 'Unit tests',
          isolate: false,
          exclude: ['**.integration.test.ts'],
        },
      },
      {
        test: {
          // 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: [
      {
        test: {
          name: 'Parallel',
          exclude: ['**.sequential.test.ts'],
        },
      },
      {
        test: {
          name: 'Sequential',
          include: ['**.sequential.test.ts'],
          fileParallelism: false,
        },
      },
    ],
  },
})
```
