Issue #20097: Fix bad use of "self" in importlib's WindowsRegistryFinder.

Lib/test/test_importlib/test_windows.py

@@ -0,0 +1,29 @@
+from . import util
+frozen_machinery, source_machinery = util.import_importlib('importlib.machinery')
+
+import sys
+import unittest
+
+
+@unittest.skipUnless(sys.platform.startswith('win'), 'requires Windows')
+class WindowsRegistryFinderTests:
+
+    # XXX Need a test that finds the spec via the registry.
+
+    def test_find_spec_missing(self):
+        spec = self.machinery.WindowsRegistryFinder.find_spec('spam')
+        self.assertIs(spec, None)
+
+    def test_find_module_missing(self):
+        loader = self.machinery.WindowsRegistryFinder.find_module('spam')
+        self.assertIs(loader, None)
+
+
+class Frozen_WindowsRegistryFinderTests(WindowsRegistryFinderTests,
+                                        unittest.TestCase):
+    machinery = frozen_machinery
+
+
+class Source_WindowsRegistryFinderTests(WindowsRegistryFinderTests,
+                                        unittest.TestCase):
+    machinery = source_machinery