issue_comments: 542938278

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https://github.com/pydata/xarray/pull/3238#issuecomment-542938278 https://api.github.com/repos/pydata/xarray/issues/3238 542938278 MDEyOklzc3VlQ29tbWVudDU0MjkzODI3OA== 5635139 2019-10-16T23:56:26Z 2019-10-16T23:56:26Z MEMBER

I think these tests are unrelated and we can merge?

```python

=================================== FAILURES =================================== ____ testdatetime_reduce[False] ______

dask = False

@arm_xfail
@pytest.mark.parametrize("dask", [False, True])
def test_datetime_reduce(dask):
    time = np.array(pd.date_range("15/12/1999", periods=11))
    time[8:11] = np.nan
    da = DataArray(np.linspace(0, 365, num=11), dims="time", coords={"time": time})

    if dask and has_dask:
        chunks = {"time": 5}
        da = da.chunk(chunks)

    actual = da["time"].mean()

  assert not pd.isnull(actual)

E AssertionError: assert not True E + where True = <function isna at 0x7fcbdefdbae8>(<xarray.DataArray 'time' ()>\narray('NaT', dtype='datetime64[ns]')) E + where <function isna at 0x7fcbdefdbae8> = pd.isnull

xarray/tests/test_duck_array_ops.py:288: AssertionError ____ test_datetime_reduce[True] ______

dask = True

@arm_xfail
@pytest.mark.parametrize("dask", [False, True])
def test_datetime_reduce(dask):
    time = np.array(pd.date_range("15/12/1999", periods=11))
    time[8:11] = np.nan
    da = DataArray(np.linspace(0, 365, num=11), dims="time", coords={"time": time})

    if dask and has_dask:
        chunks = {"time": 5}
        da = da.chunk(chunks)

    actual = da["time"].mean()

  assert not pd.isnull(actual)

E AssertionError: assert not True E + where True = <function isna at 0x7fcbdefdbae8>(<xarray.DataArray 'time' ()>\narray('NaT', dtype='datetime64[ns]')) E + where <function isna at 0x7fcbdefdbae8> = pd.isnull ```

 
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