update in installing package.

.github/workflows/unit_testing.yml

@@ -28,9 +28,8 @@ jobs:
           if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
         shell: bash
       - name: Install package with pip
-        run: |
-          pip freeze
-          pip install .
+        run:
+          python setup.py install
         shell: bash
       - name: Test with pytest
         run: |