Update python-package.yml

.github/workflows/python-package.yml

@@ -35,6 +35,9 @@ jobs:
         flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
         # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
         flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
+    - name: Install as package
+      run: |
+        python setup.py develop
     - name: Test with pytest
       run: |
         pytest