Fix pytest workflow

Author: maresb

.github/workflows/pytest.yaml

@@ -29,10 +29,18 @@ jobs:
 
     - name: Install test dependencies
       run: |
-        python -m pip install pytest pytest-xdist
-    - name: List pip package versions
-      run: python -m pip freeze --local
+        python -m pip install --upgrade pip
+        python -m pip install pytest pytest-xdist --editable .
+        python -m pip freeze --local
 
-    - name: Run tests
+    - name: Run tests not requiring xarray
       run: |
-        python -m pytest tests -v -n auto
+        python -m pytest -n auto --ignore run_sample.py --ignore tests/test_run_sample.py
+
+    - name: Install xarray
+      run: |
+        python -m pip install xarray h5netcdf
+
+    - name: Run tests requiring xarray
+      run: |
+        python -m pytest -n auto tests/test_run_sample.py