maybe final test workflow?

.github/workflows/test.yaml

@@ -4,21 +4,27 @@ on:
   push:
     branches:
       - main
+  pull_request:
+    branches:
+      - main
 
 jobs:
   build:
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ["3.5", "3.6", "3.7", "3.8", "3.9", "3.10"]
 
     steps:
     - name: Checkout repository
       uses: actions/checkout@v2
 
-    - name: Set up Python
+    - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v2
       with:
-        python-version: 3.x
+        python-version: "${{ matrix.python-version }}"
 
-    - name: Install dependencies
+    - name: Install pytest
       run: |
         python -m pip install --upgrade pip
         pip install pytest