Fix kubectl describe job event test nil pointer

Author: zhouya0

staging/src/k8s.io/kubectl/pkg/describe/BUILD

@@ -80,6 +80,7 @@ go_test(
         "//staging/src/k8s.io/api/apps/v1:go_default_library",
         "//staging/src/k8s.io/api/autoscaling/v1:go_default_library",
         "//staging/src/k8s.io/api/autoscaling/v2beta2:go_default_library",
+        "//staging/src/k8s.io/api/batch/v1:go_default_library",
         "//staging/src/k8s.io/api/coordination/v1:go_default_library",
         "//staging/src/k8s.io/api/core/v1:go_default_library",
         "//staging/src/k8s.io/api/discovery/v1beta1:go_default_library",

staging/src/k8s.io/kubectl/pkg/describe/describe.go

@@ -2116,7 +2116,9 @@ func describeJob(job *batchv1.Job, events *corev1.EventList) (string, error) {
 		if controlledBy := printController(job); len(controlledBy) > 0 {
 			w.Write(LEVEL_0, "Controlled By:\t%s\n", controlledBy)
 		}
-		w.Write(LEVEL_0, "Parallelism:\t%d\n", *job.Spec.Parallelism)
+		if job.Spec.Parallelism != nil {
+			w.Write(LEVEL_0, "Parallelism:\t%d\n", *job.Spec.Parallelism)
+		}
 		if job.Spec.Completions != nil {
 			w.Write(LEVEL_0, "Completions:\t%d\n", *job.Spec.Completions)
 		} else {

staging/src/k8s.io/kubectl/pkg/describe/describe_test.go

@@ -28,6 +28,7 @@ import (
 	appsv1 "k8s.io/api/apps/v1"
 	autoscalingv1 "k8s.io/api/autoscaling/v1"
 	autoscalingv2beta2 "k8s.io/api/autoscaling/v2beta2"
+	batchv1 "k8s.io/api/batch/v1"
 	coordinationv1 "k8s.io/api/coordination/v1"
 	corev1 "k8s.io/api/core/v1"
 	discoveryv1beta1 "k8s.io/api/discovery/v1beta1"
@@ -2698,8 +2699,14 @@ func TestDescribeEvents(t *testing.T) {
 				},
 			}, events),
 		},
-		// TODO(jchaloup): add tests for:
-		// - JobDescriber
+		"JobDescriber": &JobDescriber{
+			fake.NewSimpleClientset(&batchv1.Job{
+				ObjectMeta: metav1.ObjectMeta{
+					Name:      "bar",
+					Namespace: "foo",
+				},
+			}, events),
+		},
 		"IngressDescriber": &IngressDescriber{
 			fake.NewSimpleClientset(&networkingv1beta1.Ingress{
 				ObjectMeta: metav1.ObjectMeta{