diff --git a/.github/workflows/dev.yml b/.github/workflows/dev.yml
index e53902b..803b448 100644
--- a/.github/workflows/dev.yml
+++ b/.github/workflows/dev.yml
@@ -86,6 +86,20 @@ jobs:
           touch ./application-test.yml
           echo '${{ secrets.TEST_YML }}' > ./application-test.yml
         shell: bash
+      
+      # application-test.yml sanity check (do not print secrets/values)
+      - name: Debug application-test.yml (safe)
+        run: |
+          if [ ! -s src/main/resources/application-test.yml ]; then echo "application-test.yml: empty"; else echo "application-test.yml: present"; fi
+          if grep -Eq "^[[:space:]]*datasource[[:space:]]*:" src/main/resources/application-test.yml; then echo "datasource: present"; else echo "datasource: missing"; fi
+          if grep -Eq "^[[:space:]]*spring[[:space:]]*:" src/main/resources/application-test.yml; then echo "spring: present"; else echo "spring: missing"; fi
+          if grep -Eq "^[[:space:]]*config[[:space:]]*:" src/main/resources/application-test.yml; then echo "config: present"; else echo "config: missing"; fi
+          if grep -Eq "^[[:space:]]*activate[[:space:]]*:" src/main/resources/application-test.yml; then echo "activate: present"; else echo "activate: missing"; fi
+          if grep -Eq "^[[:space:]]*on-profile[[:space:]]*:" src/main/resources/application-test.yml; then echo "on-profile: present"; else echo "on-profile: missing"; fi
+          if grep -Eq "^[[:space:]]*url[[:space:]]*:" src/main/resources/application-test.yml; then echo "url: present"; else echo "url: missing"; fi
+          if grep -Eq "^[[:space:]]*username[[:space:]]*:" src/main/resources/application-test.yml; then echo "username: present"; else echo "username: missing"; fi
+          if grep -Eq "^[[:space:]]*password[[:space:]]*:" src/main/resources/application-test.yml; then echo "password: present"; else echo "password: missing"; fi
+        shell: bash
 
       # gradle wrapper 파일에 실행 권한을 부여
       # gradle wrapper = 개발자가 특정 버전의 Gradle을 미리 설치하지 않고도 Gradle 빌드를 실행할 수 있게 해주는 편리한 도구
@@ -126,4 +140,4 @@ jobs:
             sudo docker rm "${{ secrets.SERVICE_NAME }}" || true
             sudo docker pull "${{ secrets.DOCKERHUB_USERNAME }}"/"${{ secrets.DOCKERHUB_DEV_REPO_NAME }}":"${{ github.run_number }}"
             sudo docker run -d --name "${{ secrets.SERVICE_NAME }}" -p "${{ secrets.DEVELOP_SERVICE_PORT }}":"${{ secrets.DEVELOP_SERVICE_PORT }}" --network "${{ secrets.DEVELOP_DOCKER_NETWORK }}" "${{ secrets.DOCKERHUB_USERNAME }}"/"${{ secrets.DOCKERHUB_DEV_REPO_NAME }}":"${{ github.run_number }}"
-            sudo docker image prune -a -f
\ No newline at end of file
+            sudo docker image prune -a -f