fix: add simple test class for action validation.

.github/workflows/report.yml

@@ -0,0 +1,16 @@
+name: Report
+on:
+  workflow_run:
+    workflows: ['Tests']
+    types:
+      - completed
+jobs:
+  junit:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: dorny/test-reporter@v1
+        with:
+          artifact: test-results
+          name: JUnit Tests
+          path: '*.xml'
+          reporter: java-junit

.github/workflows/tests.yml

@@ -0,0 +1,44 @@
+name: Tests
+
+on:
+  pull_request:
+    types: [ opened, synchronize ]
+    branches:
+      - main
+
+concurrency:
+  group: ${{ github.ref }}-${{ github.workflow }}
+  cancel-in-progress: true
+
+jobs:
+  Test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up JDK
+        uses: actions/setup-java@v3
+        with:
+          java-version: '20'
+          distribution: 'zulu'
+
+      - uses: aws-actions/setup-sam@v2
+        with:
+          use-installer: true
+
+      - name: Maven Package
+        run: mvn clean package
+
+      - name: Upload Results
+        uses: actions/upload-artifact@v3
+        if: success() || failure()
+        with:
+          name: test-results
+          path: target/surefire-reports/**/*.xml
+
+      - name: Validate AWS Template
+        run: |
+          cd infra/layer
+          sam validate --lint
+          sam build