Try unittest anyway if flake8 fails.

.github/workflows/test.yaml

@@ -34,6 +34,7 @@ jobs:
         # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
         flake8 . --count --max-complexity=10 --max-line-length=127 --statistics
     - name: Test with unittest
+      if: ${{ always() }}
       timeout-minutes: 10
       run: |
         python -m sounddevice