@@ -972,10 +972,25 @@ def test_python_legacy_windows_fs_encoding(self):
972972
973973@unittest .skipUnless (support .MS_WINDOWS ,'Test only applicable on Windows' )
974974def test_python_legacy_windows_stdio (self ):
975- code = "import sys; print(sys.stdin.encoding, sys.stdout.encoding)"
976- expected = 'cp'
977- rc ,out ,err = assert_python_ok ('-c' ,code ,PYTHONLEGACYWINDOWSSTDIO = '1' )
978- self .assertIn (expected .encode (),out )
975+ # Test that _WindowsConsoleIO is used when PYTHONLEGACYWINDOWSSTDIO
976+ # is not set.
977+ # We cannot use PIPE becase it prevents creating new console.
978+ # So we use exit code.
979+ code = "import sys; sys.exit(type(sys.stdout.buffer.raw).__name__ != '_WindowsConsoleIO')"
980+ env = os .environ .copy ()
981+ env ["PYTHONLEGACYWINDOWSSTDIO" ]= ""
982+ p = subprocess .run ([sys .executable ,"-c" ,code ],
983+ creationflags = subprocess .CREATE_NEW_CONSOLE ,
984+ env = env )
985+ self .assertEqual (p .returncode ,0 )
986+
987+ # Then test that FIleIO is used when PYTHONLEGACYWINDOWSSTDIO is set.
988+ code = "import sys; sys.exit(type(sys.stdout.buffer.raw).__name__ != 'FileIO')"
989+ env ["PYTHONLEGACYWINDOWSSTDIO" ]= "1"
990+ p = subprocess .run ([sys .executable ,"-c" ,code ],
991+ creationflags = subprocess .CREATE_NEW_CONSOLE ,
992+ env = env )
993+ self .assertEqual (p .returncode ,0 )
979994
980995@unittest .skipIf ("-fsanitize" in sysconfig .get_config_vars ().get ('PY_CFLAGS' , ()),
981996"PYTHONMALLOCSTATS doesn't work with ASAN" )