try without setting python path

.github/workflows/code-cov.yml

@@ -25,13 +25,10 @@ jobs:
 
       - name: Install dependencies
         run: pip install pytest pytest-cov 
-        
+
       - name: Install pydartdiags
         run: python -m pip install .
 
-      - name: Set PYTHONPATH
-        run: echo "PYTHONPATH=$PYTHONPATH:$(pwd)" >> $GITHUB_ENV
-
       - name: Run tests
         run: pytest --cov