[AIRFLOW-5335] Simplify GCSHook test (#5958)

tests/contrib/hooks/test_gcs_hook.py

@@ -71,16 +71,28 @@ class TestGoogleCloudStorageHook(unittest.TestCase):
             self.gcs_hook = gcs_hook.GoogleCloudStorageHook(
                 google_cloud_storage_conn_id='test')
 
-    def test_storage_client_creation(self):
-        with mock.patch('google.cloud.storage.Client') as mock_client:
-            gcs_hook_1 = gcs_hook.GoogleCloudStorageHook()
-            gcs_hook_1.get_conn()
-
-            # test that Storage Client is called with required arguments
-            mock_client.assert_called_once_with(
-                client_info=mock.ANY,
-                credentials=mock.ANY,
-                project=mock.ANY)
+    @mock.patch(
+        'airflow.contrib.hooks.gcp_api_base_hook.GoogleCloudBaseHook.client_info',
+        new_callable=mock.PropertyMock,
+        return_value="CLIENT_INFO"
+    )
+    @mock.patch(
+        BASE_STRING.format("GoogleCloudBaseHook._get_credentials_and_project_id"),
+        return_value=("CREDENTIALS", "PROJECT_ID")
+    )
+    @mock.patch('google.cloud.storage.Client')
+    def test_storage_client_creation(self,
+                                     mock_client,
+                                     mock_get_creds_and_project_id,
+                                     mock_client_info):
+        hook = gcs_hook.GoogleCloudStorageHook()
+        result = hook.get_conn()
+        # test that Storage Client is called with required arguments
+        mock_client.assert_called_once_with(
+            client_info="CLIENT_INFO",
+            credentials="CREDENTIALS",
+            project="PROJECT_ID")
+        self.assertEqual(mock_client.return_value, result)
 
     @mock.patch(GCS_STRING.format('GoogleCloudStorageHook.get_conn'))
     def test_exists(self, mock_service):