=================================== FAILURES ===================================
___________________________ test_tick_add_sub[Micro] ___________________________

cls = <class 'pandas.tseries.offsets.Micro'>

    @pytest.mark.parametrize('cls', tick_classes)
>   @example(n=2, m=3)
    @example(n=800, m=300)
    @example(n=1000, m=5)
    @given(n=st.integers(-999, 999), m=st.integers(-999, 999))
    def test_tick_add_sub(cls, n, m):

pandas/tests/tseries/offsets/test_ticks.py:41: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
/opt/conda/envs/pandas-dev/lib/python3.6/site-packages/hypothesis/core.py:552: in execute
    ) % (test.__name__, text_repr[0],))
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = <hypothesis.core.StateForActualGivenExecution object at 0x7f7503574c50>
message = 'Hypothesis test_tick_add_sub(cls=Micro, n=-138, m=721) produces unreliable results: Falsified on the first call but did not on a subsequent one'

    def __flaky(self, message):
        if len(self.falsifying_examples) <= 1:
>           raise Flaky(message)
E           hypothesis.errors.Flaky: Hypothesis test_tick_add_sub(cls=Micro, n=-138, m=721) produces unreliable results: Falsified on the first call but did not on a subsequent one

/opt/conda/envs/pandas-dev/lib/python3.6/site-packages/hypothesis/core.py:727: Flaky
---------------------------------- Hypothesis ----------------------------------
Falsifying example: test_tick_add_sub(cls=Micro, n=-138, m=721)
Unreliable test timings! On an initial run, this test took 1058.10ms, which exceeded the deadline of 500.00ms, but on a subsequent run it took 0.08 ms, which did not. If you expect this sort of variability in your test timings, consider turning deadlines off for this test by setting deadline=None.

2018-11-29T22:55:51.8190144Z At D:\a\_temp\44684352-d085-41e0-85fc-7478797d5ded.ps1:3 char:1
2018-11-29T22:55:51.8190207Z + $wc.Downloadfile("https://download.microsoft.com/download/7/9/6/796EF ...
2018-11-29T22:55:51.8190284Z + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
2018-11-29T22:55:51.8190343Z     + CategoryInfo          : NotSpecified: (:) [], ParentContainsErrorRecordException
2018-11-29T22:55:51.8191084Z     + FullyQualifiedErrorId : WebException