kube-prometheus: Add e2e tests

tests/e2e/travis-e2e.sh

@@ -0,0 +1,24 @@
+#!/usr/bin/env bash
+# exit immediately when a command fails
+set -e
+# only exit with zero if all commands of the pipeline exit successfully
+set -o pipefail
+# error on unset variables
+set -u
+# print each command before executing it
+set -x
+
+SCRIPT_DIR=$(dirname "${BASH_SOURCE[0]}")
+
+"${SCRIPT_DIR}"/../../../../scripts/create-minikube.sh
+
+# waiting for kube-dns to be ready
+JSONPATH='{range .items[*]}{@.metadata.name}:{range @.status.conditions[*]}{@.type}={@.status};{end}{end}'; until kubectl -n kube-system get pods -lk8s-app=kube-dns -o jsonpath="$JSONPATH" 2>&1 | grep -q "Ready=True"; do sleep 1;echo "waiting for kube-dns to be available"; kubectl get pods --all-namespaces; done
+
+(
+    cd "${SCRIPT_DIR}"/../.. || exit
+    kubectl apply -f manifests
+    KUBECONFIG=~/.kube/config make test-e2e
+)
+
+"${SCRIPT_DIR}"/../../../../scripts/delete-minikube.sh