Add a test for semantically equal DaemonSet updates

hack/make-rules/test-cmd-util.sh

@@ -66,6 +66,7 @@ static="static"
 storageclass="storageclass"
 subjectaccessreviews="subjectaccessreviews"
 thirdpartyresources="thirdpartyresources"
+daemonsets="daemonsets"
 
 
 # Stops the running kubectl proxy, if there is one.
@@ -2574,6 +2575,22 @@ run_rs_tests() {
   fi
 }
 
+run_daemonset_tests() {
+  kube::log::status "Testing kubectl(v1:daemonsets)"
+
+  ### Create a rolling update DaemonSet
+  # Pre-condition: no DaemonSet exists
+  kube::test::get_object_assert daemonsets "{{range.items}}{{$id_field}}:{{end}}" ''
+  # Command
+  kubectl apply -f hack/testdata/rollingupdate-daemonset.yaml "${kube_flags[@]}"
+  # Template Generation should be 1
+  kube::test::get_object_assert 'daemonsets bind' "{{${template_generation_field}}}" '1'
+  kubectl apply -f hack/testdata/rollingupdate-daemonset.yaml "${kube_flags[@]}"
+  # Template Generation should stay 1
+  kube::test::get_object_assert 'daemonsets bind' "{{${template_generation_field}}}" '1'
+  kubectl delete -f hack/testdata/rollingupdate-daemonset.yaml "${kube_flags[@]}"
+}
+
 run_multi_resources_tests() {
   kube::log::status "Testing kubectl(v1:multiple resources)"
 
@@ -2798,6 +2815,7 @@ runTests() {
   deployment_second_image_field="(index .spec.template.spec.containers 1).image"
   change_cause_annotation='.*kubernetes.io/change-cause.*'
   pdb_min_available=".spec.minAvailable"
+  template_generation_field=".spec.templateGeneration"
 
   # Make sure "default" namespace exists.
   if kube::test::if_supports_resource "${namespaces}" ; then
@@ -3180,6 +3198,14 @@ runTests() {
   fi
 
 
+  ##################
+  # DaemonSets     #
+  ##################
+
+  if kube::test::if_supports_resource "${daemonsets}" ; then
+    run_daemonset_tests
+  fi
+
   ###########################
   # Replication controllers #
   ###########################

hack/testdata/rollingupdate-daemonset.yaml

+apiVersion: extensions/v1beta1
+kind: DaemonSet
+metadata:
+  name: bind
+spec:
+  updateStrategy:
+    type: RollingUpdate
+    rollingUpdate:
+      maxUnavailable: 10%
+  template:
+    metadata:
+      labels:
+        service: bind
+    spec:
+      affinity:
+        podAntiAffinity:
+          requiredDuringSchedulingIgnoredDuringExecution:
+            - labelSelector:
+                matchExpressions:
+                - key: "service"
+                  operator: "In"
+                  values: ["bind"]
+              topologyKey: "kubernetes.io/hostname"
+              namespaces: []
+      containers:
+      - name: kubernetes-pause
+        image: gcr.io/google-containers/pause:2.0