Install package in PyTest workflow before running tests

.github/workflows/pytest.yml

@@ -1,4 +1,3 @@
-
 name: PyTest
 
 on:
@@ -26,6 +25,7 @@ jobs:
         run: |
           python -m pip install --upgrade pip
           pip install setuptools chardet pathspec pytest
+          pip install .
 
       - name: Run tests
         run: |