Flaky test

[adswa]

I've seen this test past and fail over many reruns of the test battery.

=================================================================================================================== FAILURES ===================================================================================================================
______________________________________________________________________________________________________________ test_too_long_pso _______________________________________________________________________________________________________________
    def test_too_long_pso():
        samp = ut.mk_gaze_sample(
            pre_fix=1000,
            post_fix=1000,
            sacc=20,
            sacc_dist=200,
            # just under 30deg/s (max smooth pursuit)
            pso=80,
            pso_dist=100)
        data = ut.expand_samp(samp, y=0.0)
        clf = d.EyegazeClassifier(
            max_initial_saccade_freq=.2,
            **common_args)
        p = clf.preproc(data, dilate_nan=0)
        events = clf(p)
        events = ut.events2df(events)
        # there is no PSO detected
>       assert list(events['label']) == ['FIXA', 'SACC', 'FIXA']
E       AssertionError: assert ['FIXA', 'SAC...PURS', 'FIXA'] == ['FIXA', 'SACC', 'FIXA']
E         Left contains 2 more items, first extra item: 'PURS'
E         Full diff:
E         - ['FIXA', 'SACC', 'FIXA']
E         + ['FIXA', 'SACC', 'FIXA', 'PURS', 'FIXA']
E         ?                  ++++++++++++++++
remodnav/tests/test_detect.py:83: AssertionError
=============================================================================================================== warnings summary ===============================================================================================================