Attempt to add cf_units checker

Author: DocOtak

.github/workflows/ci.yml

@@ -45,13 +45,16 @@ jobs:
       uses: actions/setup-python@v2
       with:
         python-version: ${{ matrix.python-version }}
+    - name: Install udunits
+      run: sudo apt-get install -y libudunits2-dev
     - name: Run image
       uses: abatilo/[email protected]
       with:
         poetry-version: ${{ matrix.poetry-version }}
     - name: Install dependencies
       run: |
         poetry install
+        poetry run pip install cf_units==3.0.1
     - name: Test with pytest
       run: |
         poetry run pytest gsw_xarray/tests

gsw_xarray/tests/test_units.py

@@ -28,3 +28,18 @@ def test_unit_pint(func_name):
     for a in attrs:
         print(a["units"])
         ureg.Unit(a["units"])
+
+@pytest.mark.parametrize("func_name", gsw_base)
+def test_unit_cf_units(func_name):
+    cf_units = pytest.importorskip("cf_units")
+    if func_name in ["indexer", "match_args_return", "pchip_interp"]:
+        # Internal gsw cookery or non wrapped functions
+        return
+    attrs = _func_attrs[func_name]
+    if isinstance(attrs, dict):
+        attrs = [
+            attrs,
+        ]
+    for a in attrs:
+        print(a["units"])
+        cf_units.Unit(a["units"])