Add default constraints to PodTopologySpread

And update benchmark for even pod spreading to use default constraints

Signed-off-by: Aldo Culquicondor <acondor@google.com>

pkg/scheduler/framework/plugins/helper/spread_test.go

@@ -0,0 +1,105 @@
+/*
+Copyright 2020 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 helper
+
+import (
+	"fmt"
+	"reflect"
+	"testing"
+	"time"
+
+	v1 "k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/client-go/informers"
+	"k8s.io/client-go/kubernetes/fake"
+)
+
+func TestGetPodServices(t *testing.T) {
+	fakeInformerFactory := informers.NewSharedInformerFactory(&fake.Clientset{}, 0*time.Second)
+	var services []*v1.Service
+	for i := 0; i < 3; i++ {
+		service := &v1.Service{
+			ObjectMeta: metav1.ObjectMeta{
+				Name:      fmt.Sprintf("service-%d", i),
+				Namespace: "test",
+			},
+			Spec: v1.ServiceSpec{
+				Selector: map[string]string{
+					"app": fmt.Sprintf("test-%d", i),
+				},
+			},
+		}
+		services = append(services, service)
+		fakeInformerFactory.Core().V1().Services().Informer().GetStore().Add(service)
+	}
+	var pods []*v1.Pod
+	for i := 0; i < 5; i++ {
+		pod := &v1.Pod{
+			ObjectMeta: metav1.ObjectMeta{
+				Namespace: "test",
+				Name:      fmt.Sprintf("test-pod-%d", i),
+				Labels: map[string]string{
+					"app":   fmt.Sprintf("test-%d", i),
+					"label": fmt.Sprintf("label-%d", i),
+				},
+			},
+		}
+		pods = append(pods, pod)
+	}
+
+	tests := []struct {
+		name   string
+		pod    *v1.Pod
+		expect []*v1.Service
+	}{
+		{
+			name:   "GetPodServices for pod-0",
+			pod:    pods[0],
+			expect: []*v1.Service{services[0]},
+		},
+		{
+			name:   "GetPodServices for pod-1",
+			pod:    pods[1],
+			expect: []*v1.Service{services[1]},
+		},
+		{
+			name:   "GetPodServices for pod-2",
+			pod:    pods[2],
+			expect: []*v1.Service{services[2]},
+		},
+		{
+			name:   "GetPodServices for pod-3",
+			pod:    pods[3],
+			expect: nil,
+		},
+		{
+			name:   "GetPodServices for pod-4",
+			pod:    pods[4],
+			expect: nil,
+		},
+	}
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			get, err := GetPodServices(fakeInformerFactory.Core().V1().Services().Lister(), test.pod)
+			if err != nil {
+				t.Errorf("Error from GetPodServices: %v", err)
+			} else if !reflect.DeepEqual(get, test.expect) {
+				t.Errorf("Expect services %v, but got %v", test.expect, get)
+			}
+		})
+	}
+}