fix warnings found in test_importlib.test_windows

Author: graingert

Lib/test/test_importlib/test_windows.py

@@ -91,23 +91,46 @@ class WindowsRegistryFinderTests:
     test_module = "spamham{}".format(os.getpid())
 
     def test_find_spec_missing(self):
-        spec = self.machinery.WindowsRegistryFinder.find_spec('spam')
+        with self.assertWarnsRegex(
+            DeprecationWarning,
+            r"importlib\.machinery\.WindowsRegistryFinder is deprecated; "
+            r"use site configuration instead\. Future versions of Python may "
+            r"not enable this finder by default\."
+        ):
+            spec = self.machinery.WindowsRegistryFinder.find_spec('spam')
         self.assertIsNone(spec)
 
     def test_module_found(self):
         with setup_module(self.machinery, self.test_module):
-            spec = self.machinery.WindowsRegistryFinder.find_spec(self.test_module)
+            with self.assertWarnsRegex(
+                DeprecationWarning,
+                r"importlib\.machinery\.WindowsRegistryFinder is deprecated; "
+                r"use site configuration instead\. Future versions of Python may "
+                r"not enable this finder by default\."
+            ):
+                spec = self.machinery.WindowsRegistryFinder.find_spec(self.test_module)
             self.assertIsNotNone(spec)
 
     def test_module_not_found(self):
         with setup_module(self.machinery, self.test_module, path="."):
-            spec = self.machinery.WindowsRegistryFinder.find_spec(self.test_module)
+            with self.assertWarnsRegex(
+                DeprecationWarning,
+                r"importlib\.machinery\.WindowsRegistryFinder is deprecated; "
+                r"use site configuration instead\. Future versions of Python may "
+                r"not enable this finder by default\."
+            ):
+                spec = self.machinery.WindowsRegistryFinder.find_spec(self.test_module)
             self.assertIsNone(spec)
 
     def test_raises_deprecation_warning(self):
         # WindowsRegistryFinder is not meant to be instantiated, so the
         # deprecation warning is raised in the 'find_spec' method instead.
-        with self.assertWarns(DeprecationWarning):
+        with self.assertWarnsRegex(
+            DeprecationWarning,
+            r"importlib\.machinery\.WindowsRegistryFinder is deprecated; "
+            r"use site configuration instead\. Future versions of Python may "
+            r"not enable this finder by default\."
+        ):
             self.machinery.WindowsRegistryFinder.find_spec('spam')
 
 (Frozen_WindowsRegistryFinderTests,