Pytest changes default environment variables when running a file.

[KDot227]

For example with the following code

def test_env_vars():
    GOOD_ENV_VARS = {
        "PATHEXT": ".COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH;.MSC",
        "PUBLIC": r"C:\Users\Public",
        "COMMONPROGRAMFILES(X86)": r"C:\Program Files (x86)\Common Files",
        "PROGRAMFILES": r"C:\Program Files",
        "PROGRAMFILES(X86)": r"C:\Program Files (x86)",
        "DRIVERDATA": r"C:\Windows\System32\Drivers\DriverData",
        "COMMONPROGRAMFILES": r"C:\Program Files\Common Files",
        "COMMONPROGRAMW6432": r"C:\Program Files\Common Files",
        "COMMONPROGRAMFILES(X86)": r"C:\Program Files (x86)\Common Files",
    }
    for env_var, value in GOOD_ENV_VARS.items():
        assert os.environ[env_var] == value, f"{env_var} is not set correctly {os.environ[env_var]}"

On windows 11 on my current machine this will error along with all other latest windows version (I believe). Basically the only issue is that the PATHEXT env variable has .CPL appended to it which it shouldn't be default.

[RonnyPfannschmidt]

Pytest itself doesn't change environment variables besides the one denoting the current test