def test_call_complex(self):
        """Supervise an op with args and see all is reported ok."""
        root_id = self.gw.get_root().id
        self.gw.make_file(root_id, 'filename')
        self.gw.get_child_by_name(root_id, 'filename', with_content=False)
        for informed in self.informed:
            if informed[0] == 'get_child_by_name':
                self.assertTrue(isinstance(informed[1], float))
                break
        else:
            self.fail('Timing was not informed for this method.')