CI build failures

[andersy005]

Currently, the CI fails due to the entry point functionality. I don't know what's going on... It's worth looking into this ASAP...

entrypoints = [EntryPoint(name='wrf', value='xwrf.io_plugin:WRFBackendEntrypoint', group='xarray.backends'), EntryPoint(name='wrf', ...roup='xarray.backends'), EntryPoint(name='xwrf', value='xwrf.io_plugin:WRFBackendEntrypoint', group='xarray.backends')]

    def remove_duplicates(entrypoints):
        # sort and group entrypoints by name
        entrypoints = sorted(entrypoints, key=lambda ep: ep.name)
        entrypoints_grouped = itertools.groupby(entrypoints, key=lambda ep: ep.name)
        # check if there are multiple entrypoints for the same name
        unique_entrypoints = []
        for name, matches in entrypoints_grouped:
            matches = list(matches)
            unique_entrypoints.append(matches[0])
            matches_len = len(matches)
            if matches_len > 1:
>               selected_module_name = matches[0].module_name
E               AttributeError: 'EntryPoint' object has no attribute 'module_name'

/usr/share/miniconda3/envs/xwrf-dev/lib/python3.8/site-packages/xarray/backends/plugins.py:29: AttributeError

xref: https://github.com/NCAR/xwrf/runs/4303994962?check_suite_focus=true

[lpilz]

Is the CI using xarray 0.20.0? If not, it would be worth to update to that. For some earlier versions, the backend functionality is quite buggy.

[lpilz]

Some quick googling showed that it is a known issue pydata/xarray#5944. A PR for this is already merged.

A quick fix seems to be using pytest with --import-mode="append" outside the package directory.

[andersy005]

A quick fix seems to be using pytest with --import-mode="append" outside the package directory.

I ended up opting for excluding the buggy versions...