Prevent intermittent GitHub Actions failures on Windows by setting MPLBACKEND=Agg per https://github.com/orgs/community/discussions/26434#discussioncomment-3251926 - NREL#365

Author: softwareengineerprogrammer

.github/workflows/github-actions.yml

@@ -119,6 +119,10 @@ jobs:
     - name: test
       env:
         TOXPYTHON: '${{ matrix.toxpython }}'
+
+        # Prevent intermittent GitHub Actions Windows failures per https://github.com/NREL/GEOPHIRES-X/issues/365
+        MPLBACKEND: 'Agg'
+
       run: >
         tox -e ${{ matrix.tox_env }} -v
 

tests/__init__.py

@@ -0,0 +1,5 @@
+import matplotlib
+
+# Backend should be 'Agg' in GitHub Actions to prevent intermittent Windows failures
+# per https://github.com/NREL/GEOPHIRES-X/issues/365
+print(f'[DEBUG] matplotlib backend: {matplotlib.get_backend()}')