Actually deploy metric server

CHANGELOG.md

@@ -2,11 +2,12 @@
 
 *Enhancements*
 - Add Job resource class ([#295](https://github.com/Shopify/kubernetes-deploy/pull/296))
-- Add CustomResourceDefinition resource class ([#305](https://github.com/Shopify/kubernetes-deploy/pull/306))
+- Add CustomResourceDefinition resource class ([#306](https://github.com/Shopify/kubernetes-deploy/pull/306))
 - Officially support Kubernetes 1.10 ([#308](https://github.com/Shopify/kubernetes-deploy/pull/308))
 - SyncMediator will only batch fetch resources when there is a sufficiently large enough set of resources
 being tracked ([#316](https://github.com/Shopify/kubernetes-deploy/pull/316))
 - Allow CRs to be pruned based on `kubernetes-deploy.shopify.io/prunable` annotation on the custom resource definitions ([312](https://github.com/Shopify/kubernetes-deploy/pull/312))
+- Add HorizontalPodAutoscaler resource class ([#305](https://github.com/Shopify/kubernetes-deploy/pull/305))
 
 ### 0.20.4
 *Enhancements*

test/test_helper.rb

@@ -285,8 +285,13 @@ def self.prepare_pv(name)
 
     def self.deploy_metric_server
       # Set-up the metric server that the HPA needs https://github.com/kubernetes-incubator/metrics-server
+      logger = KubernetesDeploy::FormattedLogger.build("default", KubeclientHelper::MINIKUBE_CONTEXT, $stderr)
+      kubectl = KubernetesDeploy::Kubectl.new(namespace: "kube-system", context: KubeclientHelper::MINIKUBE_CONTEXT,
+        logger: logger, log_failure_by_default: true, default_timeout: '5s')
+
       Dir.glob("test/setup/metrics-server/*.{yml,yaml}*").map do |resource|
-        Kubeclient::Resource.new(YAML.safe_load(File.read(resource))).create
+        found = kubectl.run("get", "-f", resource).last.success?
+        kubectl.run("create", "-f", resource) unless found
       end
     end
   end