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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:

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:

vitest.config.ts

import { defineConfig } from 'vitest/config'

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