Add tests for `cleanup_python_site_packages`.
Add tests for `cleanup_python_site_packages`.

MikeMcQuaid/brew,MikeMcQuaid/brew,JCount/brew,Homebrew/brew,nandub/brew,nandub/brew,Homebrew/brew,Homebrew/brew,nandub/brew,Homebrew/brew,JCount/brew,JCount/brew,JCount/brew,MikeMcQuaid/brew,nandub/brew,MikeMcQuaid/brew