Merge pull request #38844 from nikhiljindal/fednewkubectlTests

Automatic merge from submit-queue

Adding test-federation-cmd.sh to test kubectl with federation apiserver

There are 2 parts to the PR:
* Adding ability to run kubectl tests for a subset of resources.
* Adding test-federation-cmd.sh that runs kubectl tests for resources that are supported by federation-apiserver.

cc @kubernetes/sig-federation @kubernetes/sig-api-machinery 

```release-note
Adding kubectl tests for federation
```

Makefile

@@ -257,6 +257,7 @@ else
 test-cmd: generated_files
 	hack/make-rules/test-kubeadm-cmd.sh
 	hack/make-rules/test-cmd.sh
+	hack/make-rules/test-federation-cmd.sh
 endif
 
 define CLEAN_HELP_INFO

hack/lib/test.sh

@@ -23,7 +23,12 @@ readonly   red=$(tput setaf 1)
 readonly green=$(tput setaf 2)
 
 kube::test::clear_all() {
-  kubectl delete "${kube_flags[@]}" rc,pods --all --grace-period=0 --force
+  if kube::test::if_supports_resource "rc" ; then
+    kubectl delete "${kube_flags[@]}" rc --all --grace-period=0 --force
+  fi
+  if kube::test::if_supports_resource "pods" ; then
+    kubectl delete "${kube_flags[@]}" pods --all --grace-period=0 --force
+  fi
 }
 
 # Force exact match of a returned result for a object query.  Wrap this with || to support multiple
@@ -223,3 +228,21 @@ kube::test::if_has_string() {
     return 1
   fi
 }
+
+# Returns true if the required resource is part of supported resources.
+# Expects env vars:
+#   SUPPORTED_RESOURCES: Array of all resources supported by the apiserver. "*"
+#   means it supports all resources. For ex: ("*") or ("rc" "*") both mean that
+#   all resources are supported.
+#   $1: Name of the resource to be tested.
+kube::test::if_supports_resource() {
+  SUPPORTED_RESOURCES=${SUPPORTED_RESOURCES:-""}
+  REQUIRED_RESOURCE=${1:-""}
+
+  for r in "${SUPPORTED_RESOURCES[@]}"; do
+    if [[ "${r}" == "*" || "${r}" == "${REQUIRED_RESOURCE}" ]]; then
+      return 0
+    fi
+  done
+  return 1
+}