Update reusable-test.yaml

Author: Woody4618

.github/workflows/reusable-test.yaml

@@ -12,6 +12,9 @@ jobs:
   test:
     runs-on: ubuntu-latest
     steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
       - uses: ./.github/actions/run-tests/
         with:
           program: ${{ github.event.inputs.program }}