test_reproject_with_extra_dims sometimes fails on Python3.5

[jnhansen]

test_reproject_with_extra_dims sometimes fails:

---

___________________________________ test_reproject_with_extra_dims[dims4] ___________________________________

dims = {'band': 5, 'extra': 2, 'time': 10, 'x': 20, ...}

    @pytest.mark.parametrize('dims', [
        {'y': 20, 'x': 20, 'time': 10, 'band': 5},
        {'x': 20, 'y': 20, 'time': 10, 'band': 5},
        {'time': 10, 'band': 5, 'x': 20, 'y': 20},
        {'time': 10, 'x': 20, 'band': 5, 'y': 20},
        {'y': 20, 'x': 20, 'time': 10, 'band': 5, 'extra': 2}
    ])
    def test_reproject_with_extra_dims(dims):
        crs1 = _parse_crs('+init=epsg:4326')
        crs2 = _parse_crs('+init=epsg:3395')
        ds = generate_test_dataset(
            dims=dims, crs=crs1
        )
    
        proj = Reprojection(crs=crs2)
        reprojected = proj.apply(ds)
    
        # Check that a reprojected slice of the dataset is the same as
        # the slice of the reprojection of the entire dataset.
        slices = [
            {'band': 3},
            {'time': slice(1, 3)}
        ]
        for s in slices:
            xr_assert_equal(
                proj.apply(ds.isel(**s)),
>               reprojected.isel(**s)
            )
E           AssertionError: Left and right Dataset objects are not equal
E           
E           
E           Differing data variables:
E           L   C12__im  (time, extra, y, x) float64 -0.4385 0.295 0.5144 ... 0.0594 -0.1833
E           R   C12__im  (time, y, x, extra) float64 -0.4385 0.7736 ... -0.1302 -0.1833
E           L   C12__re  (time, extra, y, x) float64 0.5077 0.1089 0.2545 ... 0.6105 0.2276
E           R   C12__re  (time, y, x, extra) float64 0.5077 0.1572 0.1089 ... -0.51 0.2276
E           L   C22      (time, extra, y, x) float64 -0.1661 -1.155 ... -0.6713 -0.06515
E           R   C22      (time, y, x, extra) float64 -0.1661 -0.3903 ... 0.1816 -0.06515
E           L   C11      (time, extra, y, x) float64 -0.6673 0.6047 -0.325 ... 0.5696 0.1056
E           R   C11      (time, y, x, extra) float64 -0.6673 0.03727 ... 0.01081 0.1056

nd/tests/test_warp.py:535: AssertionError