Add unit tests for methods of pod's format

pkg/kubelet/util/format/BUILD

-package(default_visibility = ["//visibility:public"])
-
-load(
-    "@io_bazel_rules_go//go:def.bzl",
-    "go_library",
-    "go_test",
-)
+load("@io_bazel_rules_go//go:def.bzl", "go_library", "go_test")
 
 go_library(
     name = "go_default_library",
@@ -13,6 +7,7 @@ go_library(
         "resources.go",
     ],
     importpath = "k8s.io/kubernetes/pkg/kubelet/util/format",
+    visibility = ["//visibility:public"],
     deps = [
         "//staging/src/k8s.io/api/core/v1:go_default_library",
         "//staging/src/k8s.io/apimachinery/pkg/types:go_default_library",
@@ -21,11 +16,17 @@ go_library(
 
 go_test(
     name = "go_default_test",
-    srcs = ["resources_test.go"],
+    srcs = [
+        "pod_test.go",
+        "resources_test.go",
+    ],
     embed = [":go_default_library"],
     deps = [
         "//staging/src/k8s.io/api/core/v1:go_default_library",
         "//staging/src/k8s.io/apimachinery/pkg/api/resource:go_default_library",
+        "//staging/src/k8s.io/apimachinery/pkg/apis/meta/v1:go_default_library",
+        "//staging/src/k8s.io/apimachinery/pkg/types:go_default_library",
+        "//vendor/github.com/stretchr/testify/assert:go_default_library",
     ],
 )
 
@@ -40,4 +41,5 @@ filegroup(
     name = "all-srcs",
     srcs = [":package-srcs"],
     tags = ["automanaged"],
+    visibility = ["//visibility:public"],
 )

pkg/kubelet/util/format/pod_test.go

+/*
+Copyright 2017 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 format
+
+import (
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+
+	"k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/types"
+)
+
+func fakeCreatePod(name, namespace string, uid types.UID) *v1.Pod {
+	return &v1.Pod{
+		ObjectMeta: metav1.ObjectMeta{
+			Name:      name,
+			Namespace: namespace,
+			UID:       uid,
+		},
+	}
+}
+
+func fakeCreatePodWithDeletionTimestamp(name, namespace string, uid types.UID, deletionTimestamp *metav1.Time) *v1.Pod {
+	return &v1.Pod{
+		ObjectMeta: metav1.ObjectMeta{
+			Name:              name,
+			Namespace:         namespace,
+			UID:               uid,
+			DeletionTimestamp: deletionTimestamp,
+		},
+	}
+}
+
+func TestPod(t *testing.T) {
+	testCases := []struct {
+		caseName      string
+		pod           *v1.Pod
+		expectedValue string
+	}{
+		{"field_empty_case", fakeCreatePod("", "", ""), "_()"},
+		{"field_normal_case", fakeCreatePod("test-pod", metav1.NamespaceDefault, "551f5a43-9f2f-11e7-a589-fa163e148d75"), "test-pod_default(551f5a43-9f2f-11e7-a589-fa163e148d75)"},
+	}
+
+	for _, testCase := range testCases {
+		realPod := Pod(testCase.pod)
+		assert.Equalf(t, testCase.expectedValue, realPod, "Failed to test: %s", testCase.caseName)
+	}
+}
+
+func TestPodAndPodDesc(t *testing.T) {
+	testCases := []struct {
+		caseName      string
+		podName       string
+		podNamesapce  string
+		podUID        types.UID
+		expectedValue string
+	}{
+		{"field_empty_case", "", "", "", "_()"},
+		{"field_normal_case", "test-pod", metav1.NamespaceDefault, "551f5a43-9f2f-11e7-a589-fa163e148d75", "test-pod_default(551f5a43-9f2f-11e7-a589-fa163e148d75)"},
+	}
+
+	for _, testCase := range testCases {
+		realPodDesc := PodDesc(testCase.podName, testCase.podNamesapce, testCase.podUID)
+		assert.Equalf(t, testCase.expectedValue, realPodDesc, "Failed to test: %s", testCase.caseName)
+	}
+}
+
+func TestPodWithDeletionTimestamp(t *testing.T) {
+	normalDeletionTime := metav1.Date(2017, time.September, 26, 14, 37, 50, 00, time.UTC)
+
+	testCases := []struct {
+		caseName               string
+		isdeletionTimestampNil bool
+		deletionTimestamp      metav1.Time
+		expectedValue          string
+	}{
+		{"timestamp_is_nil_case", true, normalDeletionTime, "test-pod_default(551f5a43-9f2f-11e7-a589-fa163e148d75)"},
+		{"timestamp_is_normal_case", false, normalDeletionTime, "test-pod_default(551f5a43-9f2f-11e7-a589-fa163e148d75):DeletionTimestamp=2017-09-26T14:37:50Z"},
+	}
+
+	for _, testCase := range testCases {
+		fakePod := fakeCreatePodWithDeletionTimestamp("test-pod", metav1.NamespaceDefault, "551f5a43-9f2f-11e7-a589-fa163e148d75", &testCase.deletionTimestamp)
+
+		if testCase.isdeletionTimestampNil {
+			fakePod.SetDeletionTimestamp(nil)
+		}
+
+		realPodWithDeletionTimestamp := PodWithDeletionTimestamp(fakePod)
+		assert.Equalf(t, testCase.expectedValue, realPodWithDeletionTimestamp, "Failed to test: %s", testCase.caseName)
+	}
+}
+
+func TestPods(t *testing.T) {
+	pod1 := fakeCreatePod("pod1", metav1.NamespaceDefault, "551f5a43-9f2f-11e7-a589-fa163e148d75")
+	pod2 := fakeCreatePod("pod2", metav1.NamespaceDefault, "e84a99bf-d1f9-43c2-9fa5-044ac85f794b")
+
+	testCases := []struct {
+		caseName      string
+		pods          []*v1.Pod
+		expectedValue string
+	}{
+		{"input_nil_case", nil, ""},
+		{"input_empty_case", []*v1.Pod{}, ""},
+		{"input_length_one_case", []*v1.Pod{pod1}, "pod1_default(551f5a43-9f2f-11e7-a589-fa163e148d75)"},
+		{"input_length_more_than_one_case", []*v1.Pod{pod1, pod2}, "pod1_default(551f5a43-9f2f-11e7-a589-fa163e148d75), pod2_default(e84a99bf-d1f9-43c2-9fa5-044ac85f794b)"},
+	}
+
+	for _, testCase := range testCases {
+		realPods := Pods(testCase.pods)
+		assert.Equalf(t, testCase.expectedValue, realPods, "Failed to test: %s", testCase.caseName)
+	}
+}
+
+func TestPodsWithDeletionTimestamps(t *testing.T) {
+	normalDeletionTime := metav1.Date(2017, time.September, 26, 14, 37, 50, 00, time.UTC)
+	pod1 := fakeCreatePodWithDeletionTimestamp("pod1", metav1.NamespaceDefault, "551f5a43-9f2f-11e7-a589-fa163e148d75", &normalDeletionTime)
+	pod2 := fakeCreatePodWithDeletionTimestamp("pod2", metav1.NamespaceDefault, "e84a99bf-d1f9-43c2-9fa5-044ac85f794b", &normalDeletionTime)
+
+	testCases := []struct {
+		caseName      string
+		pods          []*v1.Pod
+		expectedValue string
+	}{
+		{"input_nil_case", nil, ""},
+		{"input_empty_case", []*v1.Pod{}, ""},
+		{"input_length_one_case", []*v1.Pod{pod1}, "pod1_default(551f5a43-9f2f-11e7-a589-fa163e148d75):DeletionTimestamp=2017-09-26T14:37:50Z"},
+		{"input_length_more_than_one_case", []*v1.Pod{pod1, pod2}, "pod1_default(551f5a43-9f2f-11e7-a589-fa163e148d75):DeletionTimestamp=2017-09-26T14:37:50Z, pod2_default(e84a99bf-d1f9-43c2-9fa5-044ac85f794b):DeletionTimestamp=2017-09-26T14:37:50Z"},
+	}
+
+	for _, testCase := range testCases {
+		realPods := PodsWithDeletionTimestamps(testCase.pods)
+		assert.Equalf(t, testCase.expectedValue, realPods, "Failed to test: %s", testCase.caseName)
+	}
+}