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-rw-r--r--Lib/test/test_mimetypes.py9
1 files changed, 9 insertions, 0 deletions
diff --git a/Lib/test/test_mimetypes.py b/Lib/test/test_mimetypes.py
index 4098a22..392ddd2 100644
--- a/Lib/test/test_mimetypes.py
+++ b/Lib/test/test_mimetypes.py
@@ -159,6 +159,15 @@ class MimeTypesTestCase(unittest.TestCase):
# Poison should be gone.
self.assertEqual(mimetypes.guess_extension('foo/bar'), None)
+ @unittest.skipIf(sys.platform.startswith("win"), "Non-Windows only")
+ def test_guess_known_extensions(self):
+ # Issue 37529
+ # The test fails on Windows because Windows adds mime types from the Registry
+ # and that creates some duplicates.
+ from mimetypes import types_map
+ for v in types_map.values():
+ self.assertIsNotNone(mimetypes.guess_extension(v))
+
def test_preferred_extension(self):
def check_extensions():
self.assertEqual(mimetypes.guess_extension('application/octet-stream'), '.bin')