Add github action to test package generation

.github/worflows/test.yml

@@ -0,0 +1,38 @@
+name: Unit Tests
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+  merge_group:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  test:
+    name: Test Cookiecutter Package
+    runs-on: ubuntu-20.04
+    timeout-minutes: 5
+    strategy:
+      matrix:
+        python-version: ['3.10',  '3.11', '3.12']
+    steps:
+      - name: Set Up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: Check out code
+        uses: actions/checkout@v4
+      - name: Install Cookiecutter
+        run: pip install cookiecutter
+      - name: Generate project
+        run: cookiecutter --no-input .
+      - name: Install new project
+        run: pip install ./custom_codemod
+      - name: Run codemodder
+        run: codemodder --list