fix: don't crash when calling useFakeTimers in VM pool

packages/vitest/src/runtime/vm.ts

@@ -89,6 +89,9 @@ export async function run(ctx: WorkerContext) {
   context.process = process
   context.global = context
   context.console = createCustomConsole(state)
+  // TODO: don't hardcode setImmediate in fake timers defaults
+  context.setImmediate = setImmediate
+  context.clearImmediate = clearImmediate
 
   if (ctx.invalidates) {
     ctx.invalidates.forEach((fsPath) => {

test/core/test/timers.test.ts → test/core/test/fixtures/timers.suite.ts

@@ -11,7 +11,7 @@
  */
 
 import { afterEach, describe, expect, it, vi } from 'vitest'
-import { FakeTimers } from '../../../packages/vitest/src/integrations/mock/timers'
+import { FakeTimers } from '../../../../packages/vitest/src/integrations/mock/timers'
 
 class FakeDate extends Date {}
 

test/core/test/timers-jsdom.test.ts

@@ -0,0 +1,3 @@
+// @vitest-environment jsdom
+
+import './fixtures/timers.suite'

test/core/test/timers-node.test.ts

@@ -0,0 +1,3 @@
+// @vitest-environment node
+
+import './fixtures/timers.suite'