diff --git a/importlib_resources/tests/test_files.py b/importlib_resources/tests/test_files.py
index 36992d6..5de129b 100644
--- a/importlib_resources/tests/test_files.py
+++ b/importlib_resources/tests/test_files.py
@@ -35,5 +35,12 @@ class OpenZipTests(FilesTests, util.ZipSetup, unittest.TestCase):
     pass
 
 
+class OpenNamespaceTests(FilesTests, unittest.TestCase):
+    def setUp(self):
+        from . import namespacedata01
+
+        self.data = namespacedata01
+
+
 if __name__ == '__main__':
     unittest.main()
diff --git a/importlib_resources/tests/test_read.py b/importlib_resources/tests/test_read.py
index 5422eea..2616fbf 100644
--- a/importlib_resources/tests/test_read.py
+++ b/importlib_resources/tests/test_read.py
@@ -56,5 +56,12 @@ def test_read_submodule_resource_by_name(self):
         self.assertEqual(result, b'\0\1\2\3')
 
 
+class ReadNamespaceTests(ReadTests, unittest.TestCase):
+    def setUp(self):
+        from . import namespacedata01
+
+        self.data = namespacedata01
+
+
 if __name__ == '__main__':
     unittest.main()