Issue #8965: Write more tests for sys.getfilesystemencoding()

Lib/test/test_sys.py

@@ -863,21 +863,34 @@ class SizeofTest(unittest.TestCase):
         # sys.flags
         check(sys.flags, size(vh) + self.P * len(sys.flags))
 
-    @unittest.skipUnless(sys.platform == 'darwin', "test specific to Mac OS X")
     def test_getfilesystemencoding(self):
-        # On Darwing FS encoding is always UTF-8
-        fs_encoding = sys.getfilesystemencoding()
+        import codecs
+
+        def check_fsencoding(fs_encoding):
+            self.assertIsNotNone(fs_encoding)
+            if sys.platform == 'darwin':
                 self.assertEqual(fs_encoding, 'utf-8')
+            codecs.lookup(fs_encoding)
+
+        fs_encoding = sys.getfilesystemencoding()
+        check_fsencoding(fs_encoding)
 
         # Even in C locale
+        try:
+            sys.executable.encode('ascii')
+        except UnicodeEncodeError:
+            # Python doesn't start with ASCII locale if its path is not ASCII,
+            # see issue #8611
+            pass
+        else:
             env = os.environ.copy()
             env['LANG'] = 'C'
             output = subprocess.check_output(
                 [sys.executable, "-c",
                  "import sys; print(sys.getfilesystemencoding())"],
                 env=env)
-        fs_encoding = output.rstrip()
-        self.assertEqual(fs_encoding, b'utf-8')
+            fs_encoding = output.rstrip().decode('ascii')
+            check_fsencoding(fs_encoding)
 
     def test_setfilesystemencoding(self):
         old = sys.getfilesystemencoding()