fix test with pseudonetcdf 3.2

[mathause]

Fixes one part of #5872

pseudoNETCDF adds two attrs to ict files, which breaks the following two tests:

Test 1:

xarray/xarray/tests/test_backends.py

Line 3944 in 07de257

def test_ict_format(self):

Test 2:

xarray/xarray/tests/test_backends.py

Line 4030 in 07de257

def test_ict_format_write(self):

I reproduced the test file so that the tests pass again. To reproduce the file I used the following bit of code:

import xarray as xr
from xarray.tests import test_backends

fN = "xarray/tests/data/example.ict"
fmtkw = {"format": "ffi1001"}

ds = xr.open_dataset(fN, engine="pseudonetcdf", backend_kwargs={"format": "ffi1001"})

c = test_backends.TestPseudoNetCDFFormat()
c.save(ds, fN, **fmtkw)

The save method is here:

xarray/xarray/tests/test_backends.py

Line 4124 in 07de257

def save(self, dataset, path, **save_kwargs):

@barronh I would appreciate your review here - I am not sure if this is the right approach.

[github-actions]

Unit Test Results

         6 files           6 suites   53m 22s ⏱️
16 230 tests 14 494 ✔️ 1 736 💤 0 ❌
90 576 runs  82 396 ✔️ 8 180 💤 0 ❌

Results for commit d72c3be.

[barronh]

This makes sense to me. These attributes more fully describe the independent variable. They were added due to a lack of clarity and to allow better unit handling on the independent variable. Thank you for updating the test.

[mathause]

Thanks for the feedback - so I suggest to merge soonish as this breaks the tests on main.

[Illviljan]

Looks good to me. Shall we merge?

[mathause]

Jup, let's merge. Thanks!