bpo-36264: Don't honor POSIX HOME in os.path.expanduser on Windows (GH-12282)

tests/test_config.py

@@ -60,6 +60,7 @@ class BasePyPIRCCommandTestCase(support.TempdirManager,
         super(BasePyPIRCCommandTestCase, self).setUp()
         self.tmp_dir = self.mkdtemp()
         os.environ['HOME'] = self.tmp_dir
+        os.environ['USERPROFILE'] = self.tmp_dir
         self.rc = os.path.join(self.tmp_dir, '.pypirc')
         self.dist = Distribution()
 

tests/test_dist.py

@@ -463,7 +463,7 @@ class MetadataTestCase(support.TempdirManager, support.EnvironGuard,
             # win32-style
             if sys.platform == 'win32':
                 # home drive should be found
-                os.environ['HOME'] = temp_dir
+                os.environ['USERPROFILE'] = temp_dir
                 files = dist.find_config_files()
                 self.assertIn(user_filename, files,
                               '%r not found in %r' % (user_filename, files))