multiple tests with different environment options comment not working on vmThreads

[hi-ogawa]

Describe the bug

We have flaky test with vmThreads and this is reproducible with following commands. This runs two happy-dom tests with different @vitest-environment-options specified as file comment on vmThreads in single worker:

$ pnpm -C test/core test:vmThreads test/happy-dom --maxWorkers=1
...
 DEV  v4.0.15 /home/hiroshi/code/others/vitest/test/core
      API started at http://localhost:3023/

 ✓  vmThreads  test/happy-dom.test.ts (8 tests | 1 skipped) 5ms
 ❯  vmThreads  test/happy-dom-custom.test.ts (2 tests | 2 failed) 4ms
   × custom URL is changed to my-website:5435 3ms
   × accepts custom environment options 1ms

⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯ Failed Tests 2 ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯

 FAIL   vmThreads  test/happy-dom-custom.test.ts:15:1 > custom URL is changed to my-website:5435
AssertionError: expected 'http://localhost:3000/' to be 'http://my-website:5435/' // Object.is equality

Expected: "http://my-website:5435/"
Received: "http://localhost:3000/"

 ❯ test/happy-dom-custom.test.ts:16:25
     14| 
     15| it('custom URL is changed to my-website:5435', () => {
     16|   expect(location.href).toBe('http://my-website:5435/')
       |                         ^
     17| })
     18| 

⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯[1/2]⎯

It appears that environment are not reset properly between test files when different environment options are specified in file comment.

vitest/test/core/test/happy-dom.test.ts

Lines 1 to 3 in fa34701

	/**
	* @vitest-environment happy-dom
	*/

vitest/test/core/test/happy-dom-custom.test.ts

Lines 1 to 4 in fa34701

	/**
	* @vitest-environment happy-dom
	* @vitest-environment-options { "url": "http://my-website:5435", "settings": { "disableCSSFileLoading": true } }
	*/

Reproduction

See above

System Info

System:
    OS: Linux 6.17 Arch Linux
    CPU: (16) x64 12th Gen Intel(R) Core(TM) i7-12650H
    Memory: 21.54 GB / 31.05 GB
    Container: Yes
    Shell: 5.3.3 - /usr/bin/bash
  Binaries:
    Node: 22.21.1 - /home/hiroshi/.volta/tools/image/node/22.21.1/bin/node
    npm: 10.9.4 - /home/hiroshi/.volta/tools/image/node/22.21.1/bin/npm
    pnpm: 10.24.0 - /home/hiroshi/.volta/bin/pnpm
    bun: 1.2.20 - /home/hiroshi/.local/bin/bun
    Deno: 2.4.5 - /home/hiroshi/.local/bin/deno
  Browsers:
    Chromium: 142.0.7444.175
    Firefox: 145.0.1
    Firefox Developer Edition: 145.0.1
  npmPackages:
    @vitest/browser: workspace:* => 4.0.15 
    @vitest/coverage-istanbul: workspace:* => 4.0.15 
    @vitest/coverage-v8: workspace:* => 4.0.15 
    @vitest/ui: workspace:* => 4.0.15 
    vite: ^7.1.5 => 7.1.5 
    vitest: workspace:* => 4.0.15

Used Package Manager

pnpm

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