diff --git a/importlib_resources/tests/test_compatibilty_files.py b/importlib_resources/tests/test_compatibilty_files.py
index c6ece7e..d92c7c5 100644
--- a/importlib_resources/tests/test_compatibilty_files.py
+++ b/importlib_resources/tests/test_compatibilty_files.py
@@ -3,7 +3,10 @@
 
 import importlib_resources as resources
 
-from importlib_resources._adapters import CompatibilityFiles
+from importlib_resources._adapters import (
+    CompatibilityFiles,
+    wrap_spec,
+)
 
 from . import util
 
@@ -81,6 +84,10 @@ def test_orphan_path_invalid(self):
         with self.assertRaises(ValueError):
             CompatibilityFiles.OrphanPath()
 
+    def test_wrap_spec(self):
+        spec = wrap_spec(self.package)
+        self.assertIsInstance(spec.loader.get_resource_reader(None), CompatibilityFiles)
+
 
 class CompatibilityFilesNoReaderTests(unittest.TestCase):
     @property