fix test-cmd.sh

hack/make-rules/test-cmd.sh

@@ -2313,8 +2313,9 @@ __EOF__
   kubectl-with-retry rollout resume deployment nginx "${kube_flags[@]}"
   # The resumed deployment can now be rolled back
   kubectl rollout undo deployment nginx "${kube_flags[@]}"
-  # Check that the new replica set (nginx-618515232) has all old revisions stored in an annotation
-  kubectl get rs nginx-618515232 -o yaml | grep "deployment.kubernetes.io/revision-history: 1,3"
+  # Check that the new replica set has all old revisions stored in an annotation
+  newrs="$(kubectl describe deployment nginx | grep NewReplicaSet | awk '{print $2}')"
+  kubectl get rs "${newrs}" -o yaml | grep "deployment.kubernetes.io/revision-history: 1,3"
   # Check that trying to watch the status of a superseded revision returns an error
   ! kubectl rollout status deployment/nginx --revision=3
   cat hack/testdata/deployment-revision1.yaml | $SED "s/name: nginx$/name: nginx2/" | kubectl create -f - "${kube_flags[@]}"