bpo-42208: Add _locale._get_locale_encoding() (GH-23052)

* Add a new _locale._get_locale_encoding() function to get the
  current locale encoding.
* Modify locale.getpreferredencoding() to use it.
* Remove the _bootlocale module.

1 files changed, 9 insertions, 9 deletions

diff --git a/Lib/test/test_mimetypes.py b/Lib/test/test_mimetypes.py
index ddeae38..d63f6b6 100644
--- a/Lib/test/test_mimetypes.py
+++ b/Lib/test/test_mimetypes.py
@@ -3,7 +3,7 @@ import locale
 import mimetypes
 import pathlib
 import sys
-import unittest
+import unittest.mock
 
 from test import support
 from test.support import os_helper
@@ -71,14 +71,14 @@ class MimeTypesTestCase(unittest.TestCase):
         # bpo-41048: read_mime_types should read the rule file with 'utf-8' encoding.
         # Not with locale encoding. _bootlocale has been imported because io.open(...)
         # uses it.
-        with os_helper.temp_dir() as directory:
-            data = "application/no-mans-land  Fran\u00E7ais"
-            file = pathlib.Path(directory, "sample.mimetype")
-            file.write_text(data, encoding='utf-8')
-            import _bootlocale
-            with support.swap_attr(_bootlocale, 'getpreferredencoding', lambda do_setlocale=True: 'ASCII'):
-                mime_dict = mimetypes.read_mime_types(file)
-            eq(mime_dict[".Français"], "application/no-mans-land")
+        data = "application/no-mans-land  Fran\u00E7ais"
+        filename = "filename"
+        fp = io.StringIO(data)
+        with unittest.mock.patch.object(mimetypes, 'open',
+                                        return_value=fp) as mock_open:
+            mime_dict = mimetypes.read_mime_types(filename)
+            mock_open.assert_called_with(filename, encoding='utf-8')
+        eq(mime_dict[".Français"], "application/no-mans-land")
 
     def test_non_standard_types(self):
         eq = self.assertEqual