apiVersion: kuttl.dev/v1beta1
kind: TestStep
commands:
  - script: |
      if kubectl apply -f resource.yaml 2>&1 | grep -q 'validation error: The label app=foo is required'
      then 
        echo "Test succeeded. Resource creation was blocked."
        exit 0
      else 
        echo "Tested failed. Resource was created."
        exit 1 
      fi