add tests for polymorphichelpers pkg

pkg/kubectl/polymorphichelpers/mapbasedselectorforobject_test.go

@@ -0,0 +1,142 @@
+/*
+Copyright 2018 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.
+*/
+
+package polymorphichelpers
+
+import (
+	"testing"
+
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/runtime"
+	api "k8s.io/kubernetes/pkg/apis/core"
+	"k8s.io/kubernetes/pkg/apis/extensions"
+)
+
+func TestMapBasedSelectorForObject(t *testing.T) {
+	tests := []struct {
+		object         runtime.Object
+		expectSelector string
+		expectErr      bool
+	}{
+		{
+			object: &api.ReplicationController{
+				Spec: api.ReplicationControllerSpec{
+					Selector: map[string]string{
+						"foo": "bar",
+					},
+				},
+			},
+			expectSelector: "foo=bar",
+		},
+		{
+			object:    &api.Pod{},
+			expectErr: true,
+		},
+		{
+			object: &api.Pod{
+				ObjectMeta: metav1.ObjectMeta{
+					Labels: map[string]string{
+						"foo": "bar",
+					},
+				},
+			},
+			expectSelector: "foo=bar",
+		},
+		{
+			object: &api.Service{
+				Spec: api.ServiceSpec{
+					Selector: map[string]string{
+						"foo": "bar",
+					},
+				},
+			},
+			expectSelector: "foo=bar",
+		},
+		{
+			object:    &api.Service{},
+			expectErr: true,
+		},
+		{
+			object: &extensions.Deployment{
+				Spec: extensions.DeploymentSpec{
+					Selector: &metav1.LabelSelector{
+						MatchLabels: map[string]string{
+							"foo": "bar",
+						},
+					},
+				},
+			},
+			expectSelector: "foo=bar",
+		},
+		{
+			object: &extensions.Deployment{
+				Spec: extensions.DeploymentSpec{
+					Selector: &metav1.LabelSelector{
+						MatchExpressions: []metav1.LabelSelectorRequirement{
+							{
+								Key: "foo",
+							},
+						},
+					},
+				},
+			},
+			expectErr: true,
+		},
+		{
+			object: &extensions.ReplicaSet{
+				Spec: extensions.ReplicaSetSpec{
+					Selector: &metav1.LabelSelector{
+						MatchLabels: map[string]string{
+							"foo": "bar",
+						},
+					},
+				},
+			},
+			expectSelector: "foo=bar",
+		},
+		{
+			object: &extensions.ReplicaSet{
+				Spec: extensions.ReplicaSetSpec{
+					Selector: &metav1.LabelSelector{
+						MatchExpressions: []metav1.LabelSelectorRequirement{
+							{
+								Key: "foo",
+							},
+						},
+					},
+				},
+			},
+			expectErr: true,
+		},
+		{
+			object:    &api.Node{},
+			expectErr: true,
+		},
+	}
+
+	for _, test := range tests {
+		actual, err := mapBasedSelectorForObject(test.object)
+		if test.expectErr && err == nil {
+			t.Error("unexpected non-error")
+		}
+		if !test.expectErr && err != nil {
+			t.Errorf("unexpected error: %v", err)
+		}
+		if actual != test.expectSelector {
+			t.Errorf("expected selector %q, but got %q", test.expectSelector, actual)
+		}
+	}
+}