1 files changed, 24 insertions, 0 deletions
diff --git a/Lib/test/test_importlib/test_windows.py b/Lib/test/test_importlib/test_windows.py
index 46e23be..c893bcf 100644
--- a/Lib/test/test_importlib/test_windows.py
+++ b/Lib/test/test_importlib/test_windows.py
@@ -2,9 +2,11 @@ from . import util as test_util
 machinery = test_util.import_importlib('importlib.machinery')
 
 import os
+import re
 import sys
 import unittest
 from test import support
+from distutils.util import get_platform
 from contextlib import contextmanager
 from .util import temp_module
 
@@ -83,3 +85,25 @@ class WindowsRegistryFinderTests:
 (Frozen_WindowsRegistryFinderTests,
  Source_WindowsRegistryFinderTests
  ) = test_util.test_both(WindowsRegistryFinderTests, machinery=machinery)
+
+@unittest.skipUnless(sys.platform.startswith('win'), 'requires Windows')
+class WindowsExtensionSuffixTests:
+    def test_tagged_suffix(self):
+        suffixes = self.machinery.EXTENSION_SUFFIXES
+        expected_tag = ".cp{0.major}{0.minor}-{1}.pyd".format(sys.version_info,
+            re.sub('[^a-zA-Z0-9]', '_', get_platform()))
+        try:
+            untagged_i = suffixes.index(".pyd")
+        except ValueError:
+            untagged_i = suffixes.index("_d.pyd")
+            expected_tag = "_d" + expected_tag
+
+        self.assertIn(expected_tag, suffixes)
+
+        # Ensure the tags are in the correct order
+        tagged_i = suffixes.index(expected_tag)
+        self.assertLess(tagged_i, untagged_i)
+
+(Frozen_WindowsExtensionSuffixTests,
+ Source_WindowsExtensionSuffixTests
+ ) = test_util.test_both(WindowsExtensionSuffixTests, machinery=machinery)