Tests for list Object store added

Earlier commit was "Added integration test for SG" instead of
"Tests for SG Create and SG rules create and delete added"

cloudbridge/cloud/providers/azure/mock_azure_client.py

@@ -97,6 +97,9 @@ class MockAzureClient:
                 return container
         return None
 
+    def list_containers(self):
+        return self.containers
+
     def create_container(self, container_name):
         new_container = Container()
         new_container.name = container_name

test/test_azure_object_store_service.py

@@ -22,6 +22,13 @@ class AzureObjectStoreServiceTestCase(ProviderTestBase):
             container.name == container_name,
             "Name of the container should be {0}".format(container_name))
 
+    @helpers.skipIfNoService(['object_store'])
+    def test_azure_bucket_list(self):
+        containerList = self.provider.object_store.list()
+        print("List Container - " + str(containerList))
+        self.assertEqual(
+            len(containerList), 1)
+
     @helpers.skipIfNoService(['object_store'])
     def test_azure_bucket_find_Exist(self):
         container = self.provider.object_store.find("container1")