Add e2e test for round robin load balancing

test/e2e/settings/load_balance.go

@@ -0,0 +1,83 @@
+/*
+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 settings
+
+import (
+	"net/http"
+	"regexp"
+	"strings"
+	"time"
+
+	"github.com/parnurzeal/gorequest"
+
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+
+	"k8s.io/ingress-nginx/test/e2e/framework"
+)
+
+var _ = framework.IngressNginxDescribe("Load Balance", func() {
+	f := framework.NewDefaultFramework("load-balance")
+
+	setting := "load-balance"
+
+	BeforeEach(func() {
+		f.NewEchoDeploymentWithReplicas(3)
+	})
+
+	AfterEach(func() {
+		f.UpdateNginxConfigMapData(setting, "")
+
+	})
+
+	It("should evenly distribute requests with round-robin (default algorithm)", func() {
+		host := "load-balance.com"
+
+		f.EnsureIngress(framework.NewSingleIngress(host, "/", host, f.IngressController.Namespace, "http-svc", 80, nil))
+
+		f.WaitForNginxServer(host,
+			func(server string) bool {
+				return strings.Contains(server, "server_name load-balance.com")
+			})
+
+		re, _ := regexp.Compile(`http-svc.*`)
+		replicaRequestCount := map[string]int{}
+
+		for i := 0; i < 600; i++ {
+			_, body, errs := gorequest.New().
+				Get(f.IngressController.HTTPURL).
+				Set("Host", host).
+				Retry(10, 1*time.Second, http.StatusNotFound, http.StatusServiceUnavailable).
+				End()
+			Expect(len(errs)).Should(BeNumerically("==", 0))
+
+			replica := re.FindString(body)
+			Expect(replica).ShouldNot(Equal(""))
+
+			if _, ok := replicaRequestCount[replica]; !ok {
+				replicaRequestCount[replica] = 1
+			} else {
+				replicaRequestCount[replica]++
+			}
+		}
+
+		acceptableRequestRange := []int{198, 199, 200, 201, 202}
+		for _, v := range replicaRequestCount {
+			Expect(acceptableRequestRange).Should(ContainElement(v))
+		}
+	})
+})