fix test-cmd multi-resource test

hack/test-cmd.sh

@@ -2031,7 +2031,7 @@ __EOF__
     fi
     kubectl describe -f "${file}" "${kube_flags[@]}"
     # Command
-    kubectl replace -f $replace_file --force "${kube_flags[@]}"
+    kubectl replace -f $replace_file --force --cascade "${kube_flags[@]}"
     # Post-condition: mock service (and mock2) and mock rc (and mock2) are replaced
     if [ "$has_svc" = true ]; then
       kube::test::get_object_assert 'services mock' "{{${labels_field}.status}}" 'replaced'

hack/testdata/multi-resource-yaml-modify.yaml

@@ -19,6 +19,8 @@ metadata:
   name: mock
 spec:
   replicas: 1
+  selector:
+    app: mock
   template:
     metadata:
       labels:

hack/testdata/multi-resource-yaml.yaml

@@ -18,6 +18,8 @@ metadata:
   name: mock
 spec:
   replicas: 1
+  selector:
+    app: mock
   template:
     metadata:
       labels: