Update workflow

.github/workflows/ci.yml

@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        py: [ 3.9 ]
+        python-version: [ "3.9", "3.10", "3.11" ]
     steps:
     - uses: actions/checkout@v4
     - name: Install Python ${{ matrix.py }}
@@ -32,6 +32,8 @@ jobs:
       run: |
         python -m pip install --upgrade pip
         python -m pip install -e .[test]
-    - name: Run unittest
+    - name: Test with pytest
       shell: bash
-      run: pytest
+      run: | 
+        pip install pytest 
+        pytest