Add e2e scenario for metrics-server

tests/e2e/scenarios/metrics-server/run-test.sh

@@ -0,0 +1,37 @@
+#!/usr/bin/env bash
+
+# Copyright 2021 The Kubernetes Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+REPO_ROOT=$(git rev-parse --show-toplevel);
+source "${REPO_ROOT}"/tests/e2e/scenarios/lib/common.sh
+
+kops-acquire-latest
+
+OVERRIDES="$OVERRIDES --override=cluster.spec.metricsServer.enabled=true"
+OVERRIDES="$OVERRIDES --override=cluster.spec.certManager.enabled=true"
+
+kops-up
+
+# shellcheck disable=SC2164
+cd "$(mktemp -dt kops.XXXXXXXXX)"
+
+git clone --branch v0.4.4 https://github.com/kubernetes-sigs/metrics-server.git .
+
+# The prometheus test expects to have only one metrics-server pod, but we use two
+# We scale down to meet test expectation
+kubectl scale -n kube-system deploy --replicas=1
+
+# shellcheck disable=SC2164
+go test -v ./test/e2e_test.go -count=1