Intermitted error in test_datasaver_scalars

[jenshnielsen]

    @settings(max_examples=5, deadline=None,
              suppress_health_check=(HealthCheck.function_scoped_fixture,))
    @given(breakpoint=hst.integers(min_value=1, max_value=19),
           write_period=hst.floats(min_value=0.1, max_value=1.5),
           set_values=hst.lists(elements=hst.floats(), min_size=20, max_size=20),
           get_values=hst.lists(elements=hst.floats(), min_size=20, max_size=20))
    @pytest.mark.usefixtures('set_default_station_to_none')
    def test_datasaver_scalars(experiment, DAC, DMM, set_values, get_values,
                               breakpoint, write_period):
        no_of_runs = len(experiment)
    
        station = qc.Station(DAC, DMM)
    
        meas = Measurement(station=station)
        meas.write_period = write_period
    
        assert meas.write_period == write_period
    
        meas.register_parameter(DAC.ch1)
        meas.register_parameter(DMM.v1, setpoints=(DAC.ch1,))
    
        with meas.run() as datasaver:
            for set_v, get_v in zip(set_values[:breakpoint],
                                    get_values[:breakpoint]):
                datasaver.add_result((DAC.ch1, set_v), (DMM.v1, get_v))
    
            assert datasaver._dataset.number_of_results == 0
            sleep(write_period * 1.1)
            datasaver.add_result((DAC.ch1, set_values[breakpoint]),
                                 (DMM.v1, get_values[breakpoint]))
>           assert datasaver.points_written == breakpoint + 1
E           assert 0 == (1 + 1)
E            +  where 0 = <qcodes.dataset.measurements.DataSaver object at 0x000002006588C8B0>.points_written

See details in the log below.

errorlog.txt