gistfile1.txt

    @mock.patch('nova.utils.get_image_from_system_metadata')
    def test_get_image_meta_cached_uses_system_metadata(self, mock_get_image):
        mock_get_image.return_value = self.image

        instance = self.instance_obj
        instance.image_ref = 'fake-image-1'
        with mock.patch('nova.utils.instance_sys_meta') as mock_inst_sys_meta:
            mock_inst_sys_meta.return_value = mock.sentinel.inst_sys_meta
            image_meta = compute_utils.get_image_metadata(
                self.ctx, self.mock_image_api, 'fake-image-1', instance)
            mock_inst_sys_meta.assert_called_once_with(instance)

        self.image['properties'] = 'DONTCARE'
        self.assertThat(self.image, matchers.DictMatches(image_meta))
        mock_get_image.assert_called_once_with(mock.sentinel.inst_sys_meta)
        self.assertFalse(self.mock_image_api.get.called)