add unit test for static pod name generation

pkg/kubelet/config/BUILD

@@ -108,6 +108,7 @@ go_test(
         "//pkg/apis/core/validation:go_default_library",
         "//pkg/kubelet/types:go_default_library",
         "//pkg/securitycontext:go_default_library",
+        "//vendor/github.com/stretchr/testify/assert:go_default_library",
         "//vendor/k8s.io/api/core/v1:go_default_library",
         "//vendor/k8s.io/apimachinery/pkg/api/equality:go_default_library",
         "//vendor/k8s.io/apimachinery/pkg/apis/meta/v1:go_default_library",

pkg/kubelet/config/common_test.go

@@ -20,12 +20,17 @@ import (
 	"reflect"
 	"testing"
 
+	"github.com/stretchr/testify/assert"
+
 	"k8s.io/api/core/v1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apimachinery/pkg/types"
 	"k8s.io/kubernetes/pkg/api/legacyscheme"
 	"k8s.io/kubernetes/pkg/api/testapi"
+	"k8s.io/kubernetes/pkg/apis/core"
 	api "k8s.io/kubernetes/pkg/apis/core"
+	"k8s.io/kubernetes/pkg/apis/core/validation"
 	"k8s.io/kubernetes/pkg/securitycontext"
 )
 
@@ -189,3 +194,59 @@ func TestGetSelfLink(t *testing.T) {
 		}
 	}
 }
+
+func TestStaticPodNameGenerate(t *testing.T) {
+	testCases := []struct {
+		nodeName  types.NodeName
+		podName   string
+		expected  string
+		overwrite string
+		shouldErr bool
+	}{
+		{
+			"node1",
+			"static-pod1",
+			"static-pod1-node1",
+			"",
+			false,
+		},
+		{
+			"Node1",
+			"static-pod1",
+			"static-pod1-node1",
+			"",
+			false,
+		},
+		{
+			"NODE1",
+			"static-pod1",
+			"static-pod1-node1",
+			"static-pod1-NODE1",
+			true,
+		},
+	}
+	for _, c := range testCases {
+		assert.Equal(t, c.expected, generatePodName(c.podName, c.nodeName), "wrong pod name generated")
+		pod := &core.Pod{}
+		pod.Name = c.podName
+		if c.overwrite != "" {
+			pod.Name = c.overwrite
+		}
+		errs := validation.ValidatePod(pod)
+		if c.shouldErr {
+			specNameErrored := false
+			for _, err := range errs {
+				if err.Field == "metadata.name" {
+					specNameErrored = true
+				}
+			}
+			assert.NotEmpty(t, specNameErrored, "expecting error")
+		} else {
+			for _, err := range errs {
+				if err.Field == "metadata.name" {
+					t.Fail()
+				}
+			}
+		}
+	}
+}