gh-156376: Make test_environ_path_cwd independent of the ambient environment - #156377
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gh-156376: Make test_environ_path_cwd independent of the ambient environment#156377KindPinningFinalBoss wants to merge 1 commit into
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…t environment shutil.which() only inserts the current directory into the search path when _winapi.NeedCurrentDirectoryForExePath() returns true, and that consults the NoDefaultCurrentDirectoryInExePath environment variable. On a machine where that variable is set, TestWhich.test_environ_path_cwd and TestWhichBytes.test_environ_path_cwd failed because which() correctly declined to search the current directory. Unset the variable inside the EnvironmentVarGuard the test already uses, so an ambient value cannot change what the test exercises.
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TestWhich.test_environ_path_cwdandTestWhichBytes.test_environ_path_cwdfail on Windows when
NoDefaultCurrentDirectoryInExePathis set in theenvironment the test suite runs in.
The test clears
PATHso thatshutil.which()falls back to the currentdirectory, then asserts the result is
.\<file>. Butshutil.which()onlyinserts the current directory into the search path when
_win_path_needs_curdir()returns true, which delegates to_winapi.NeedCurrentDirectoryForExePath(). That API consultsNoDefaultCurrentDirectoryInExePath, so when the variable is presentwhich()correctly declines to search the current directory and theassertion fails.
The test already opens an
os_helper.EnvironmentVarGuardto setPATH;this unsets
NoDefaultCurrentDirectoryInExePathin the same guard so theambient environment cannot change what the test exercises.
TestWhich.test_win_path_needs_curdirin the same class already accountsfor this mechanism by patching
_winapi.NeedCurrentDirectoryForExePath.Verified on Windows 11,
mainat 04242c0:No behaviour change to
shutil; test-only.