adding some basic GKE tests

lookup/gke.go

@@ -44,7 +44,7 @@ func getClusterInfo(c *clientcmdapi.Config, kubeContext string) *gkeClusterInfo
 
 	ci := gkeClusterInfo{}
 
-	if context.Cluster != "" {
+	if context != nil && context.Cluster != "" {
 		s := strings.Split(context.Cluster, "_")
 		if s[0] == "gke" {
 			ci.ClusterName = s[3]

lookup/gke_test.go

@@ -0,0 +1,41 @@
+// Copyright 2018 ReactiveOps
+//
+// 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.
+
+package lookup
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+
+	clientcmdapi "k8s.io/client-go/tools/clientcmd/api"
+)
+
+func TestGetClusterInfo(t *testing.T) {
+	config1 := clientcmdapi.Config{
+		Contexts: map[string]*clientcmdapi.Context{
+			"not-gke": {
+				Cluster: "helloworld",
+			},
+			"actual-gke": {
+				Cluster: "gke_reactiveopsio_us-central1-a_rbac-lookup-testing",
+			},
+		},
+		CurrentContext: "bar",
+	}
+
+	assert.Equal(t, getClusterInfo(&config1, "").ClusterName, "")
+	assert.Equal(t, getClusterInfo(&config1, "not-gke").ClusterName, "")
+	assert.Equal(t, getClusterInfo(&config1, "actual-gke").ClusterName, "rbac-lookup-testing")
+}