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diff --git a/azure/aria/aria-extension-cloudify/src/aria/tests/test_extension.py b/azure/aria/aria-extension-cloudify/src/aria/tests/test_extension.py
new file mode 100644
index 0000000..f0378fd
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+++ b/azure/aria/aria-extension-cloudify/src/aria/tests/test_extension.py
@@ -0,0 +1,156 @@
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import pytest
+
+from aria import extension
+
+# #pylint: disable=no-member,no-method-argument,unused-variable
+
+
+class TestRegistrar(object):
+
+    def test_list_based_registrar_with_single_element_registration(self):
+        class ExtensionRegistration(extension._ExtensionRegistration):
+            @extension._registrar
+            def list_based_registrar(*_):
+                return []
+        extension_registration = ExtensionRegistration()
+
+        @extension_registration
+        class Extension(object):
+            def list_based_registrar(self):
+                return True
+
+        assert extension_registration.list_based_registrar() == []
+        extension_registration.init()
+        assert extension_registration.list_based_registrar() == [True]
+
+    def test_list_based_registrar_with_sequence_element_registration(self):
+        class ExtensionRegistration(extension._ExtensionRegistration):
+            @extension._registrar
+            def list_based_registrar1(*_):
+                return []
+
+            @extension._registrar
+            def list_based_registrar2(*_):
+                return []
+
+            @extension._registrar
+            def list_based_registrar3(*_):
+                return []
+        extension_registration = ExtensionRegistration()
+
+        @extension_registration
+        class Extension(object):
+            def list_based_registrar1(*_):
+                return [True, True]
+
+            def list_based_registrar2(*_):
+                return True, True
+
+            def list_based_registrar3(*_):
+                return set([True])
+
+        extension_registration.init()
+        assert extension_registration.list_based_registrar1() == [True, True]
+        assert extension_registration.list_based_registrar2() == [True, True]
+        assert extension_registration.list_based_registrar3() == [True]
+
+    def test_dict_based_registrar(self):
+        class ExtensionRegistration(extension._ExtensionRegistration):
+            @extension._registrar
+            def dict_based_registrar(*_):
+                return {}
+        extension_registration = ExtensionRegistration()
+
+        @extension_registration
+        class Extension1(object):
+            def dict_based_registrar(self):
+                return {
+                    'a': 'a',
+                    'b': 'b'
+                }
+
+        @extension_registration
+        class Extension2(object):
+            def dict_based_registrar(self):
+                return {
+                    'c': 'c',
+                    'd': 'd'
+                }
+
+        assert extension_registration.dict_based_registrar() == {}
+        extension_registration.init()
+        assert extension_registration.dict_based_registrar() == {
+            'a': 'a',
+            'b': 'b',
+            'c': 'c',
+            'd': 'd'
+        }
+
+    def test_invalid_duplicate_key_dict_based_registrar(self):
+        class ExtensionRegistration(extension._ExtensionRegistration):
+            @extension._registrar
+            def dict_based_registrar(*_):
+                return {}
+        extension_registration = ExtensionRegistration()
+
+        @extension_registration
+        class Extension1(object):
+            def dict_based_registrar(self):
+                return {
+                    'a': 'val1',
+                }
+
+        @extension_registration
+        class Extension2(object):
+            def dict_based_registrar(self):
+                return {
+                    'a': 'val2',
+                }
+
+        with pytest.raises(RuntimeError):
+            extension_registration.init()
+
+    def test_unsupported_registrar(self):
+        with pytest.raises(RuntimeError):
+            class ExtensionRegistration(extension._ExtensionRegistration):
+                @extension._registrar
+                def unsupported_registrar(*_):
+                    return set()
+            extension_registration = ExtensionRegistration()
+
+            @extension_registration
+            class Extension(object):
+                def unsupported_registrar(self):
+                    return True
+
+            extension_registration.init()
+
+    def test_unimplemented_registration(self):
+        class ExtensionRegistration(extension._ExtensionRegistration):
+            @extension._registrar
+            def list_based_registrar(*_):
+                return []
+        extension_registration = ExtensionRegistration()
+
+        @extension_registration
+        class Extension(object):
+            pass
+
+        assert extension_registration.list_based_registrar() == []
+        extension_registration.init()
+        assert extension_registration.list_based_registrar() == []