Regression: window.parent is undefined

[potty]

Describe the bug

window.parent was not undefined in Vitest v0.12.6 and below.
It is now undefined in Vitest v0.12.7+.

Reproduction

https://stackblitz.com/edit/vitest-dev-vitest-hrrsok?file=test/basic.test.ts

System Info

System:
    OS: macOS 12.3.1
    CPU: (8) x64 Apple M1
    Memory: 26.05 MB / 16.00 GB
    Shell: 5.8 - /bin/zsh
  Binaries:
    Node: 18.3.0 - /usr/local/bin/node
    Yarn: 1.22.17 - /usr/local/bin/yarn
    npm: 8.11.0 - /usr/local/bin/npm
    Watchman: 4.9.0 - /usr/local/bin/watchman
  Browsers:
    Chrome: 102.0.5005.61
    Chrome Canary: 105.0.5118.3
    Firefox Developer Edition: 102.0
    Safari: 15.4
  npmPackages:
    vite: ^2.9.12 => 2.9.12 
    vitest: 0.14.2 => 0.14.2

Used Package Manager

pnpm

Validations

• Follow our Code of Conduct
• Read the Contributing Guidelines.
• Read the docs.
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• Check that this is a concrete bug. For Q&A open a GitHub Discussion or join our Discord Chat Server.
• The provided reproduction is a minimal reproducible example of the bug.