def test_readonly_datetime(helpers):
        with pytest.raises(exceptions.ValidationError) as excinfo:
            pytest.app.records.create(
                **{"Required Date & Time": pendulum.now(), "Read-only Date & Time": pendulum.now()})
        assert str(excinfo.value) == 'Validation failed for <Record: %s - New>. Reason: Cannot set readonly field \'Read-only Date & Time\'' % pytest.app.acronym