append test to end of format workflow

.github/workflows/format.yml

@@ -22,3 +22,12 @@ jobs:
         with:
           message: 'Commit automated formatter changes'
           add: '.'
+      - uses: actions/setup-python@v5
+        with:
+          python-version: '3.9'
+      - name: Install test requirements
+        run: |
+          python3 -m pip install -r requirements.txt
+      - name: Run tests
+        run: |
+          make test