From e988217fdf82d41857d9ddb1bba8b54e404fbf11 Mon Sep 17 00:00:00 2001
From: Elvin Efendi <elvin.efendiyev@gmail.com>
Date: Wed, 3 Jul 2019 00:09:30 -0400
Subject: [PATCH] e2e test for ewma

---
 test/e2e/loadbalance/ewma.go | 82 ++++++++++++++++++++++++++++++++++++
 1 file changed, 82 insertions(+)
 create mode 100644 test/e2e/loadbalance/ewma.go

diff --git a/test/e2e/loadbalance/ewma.go b/test/e2e/loadbalance/ewma.go
new file mode 100644
index 000000000..dc5b60416
--- /dev/null
+++ b/test/e2e/loadbalance/ewma.go
@@ -0,0 +1,82 @@
+/*
+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 loadbalance
+
+import (
+	"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 - EWMA", func() {
+	f := framework.NewDefaultFramework("ewma")
+
+	BeforeEach(func() {
+		f.NewEchoDeploymentWithReplicas(3)
+		f.UpdateNginxConfigMapData("worker-processes", "2")
+		f.UpdateNginxConfigMapData("load-balance", "ewma")
+	})
+
+	It("does not fail requests", func() {
+		host := "load-balance.com"
+
+		f.EnsureIngress(framework.NewSingleIngress(host, "/", host, f.Namespace, "http-svc", 80, nil))
+		f.WaitForNginxServer(host,
+			func(server string) bool {
+				return strings.Contains(server, "server_name load-balance.com")
+			})
+		time.Sleep(waitForLuaSync)
+
+		algorithm, err := f.GetLbAlgorithm("http-svc", 80)
+		Expect(err).Should(BeNil())
+		Expect(algorithm).Should(Equal("ewma"))
+
+		re, _ := regexp.Compile(`http-svc.*`)
+		replicaRequestCount := map[string]int{}
+
+		for i := 0; i < 30; i++ {
+			_, body, errs := gorequest.New().
+				Get(f.GetURL(framework.HTTP)).
+				Set("Host", host).
+				End()
+			Expect(errs).Should(BeEmpty())
+
+			replica := re.FindString(body)
+			Expect(replica).ShouldNot(Equal(""))
+
+			if _, ok := replicaRequestCount[replica]; !ok {
+				replicaRequestCount[replica] = 1
+			} else {
+				replicaRequestCount[replica]++
+			}
+		}
+		framework.Logf("Request distribution: %v", replicaRequestCount)
+
+		actualCount := 0
+		for _, v := range replicaRequestCount {
+			actualCount += v
+		}
+		Expect(actualCount).Should(Equal(30))
+	})
+})