Add gce-ingress e2e test for sync failure case

test/e2e/network/BUILD

@@ -47,6 +47,7 @@ go_library(
         "//vendor/github.com/onsi/gomega:go_default_library",
         "//vendor/google.golang.org/api/compute/v0.alpha:go_default_library",
         "//vendor/k8s.io/api/core/v1:go_default_library",
+        "//vendor/k8s.io/api/extensions/v1beta1:go_default_library",
         "//vendor/k8s.io/api/networking/v1:go_default_library",
         "//vendor/k8s.io/api/rbac/v1beta1:go_default_library",
         "//vendor/k8s.io/apimachinery/pkg/api/errors:go_default_library",

test/e2e/network/ingress.go

@@ -21,9 +21,11 @@ import (
 	"path/filepath"
 	"time"
 
+	extensions "k8s.io/api/extensions/v1beta1"
 	rbacv1beta1 "k8s.io/api/rbac/v1beta1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/runtime/schema"
+	"k8s.io/apimachinery/pkg/util/intstr"
 	"k8s.io/apimachinery/pkg/util/wait"
 	"k8s.io/apiserver/pkg/authentication/serviceaccount"
 	"k8s.io/kubernetes/test/e2e/framework"
@@ -153,6 +155,96 @@ var _ = SIGDescribe("Loadbalancing: L7", func() {
 			// framework.ExpectNoError(jig.verifyURL(fmt.Sprintf("https://%v/", ip), "", 30, 1*time.Second, httpClient))
 		})
 
+		It("should update ingress while sync failures occur on other ingresses", func() {
+			By("Creating ingresses that would fail on sync.")
+			ingFailTLSBackend := &extensions.Ingress{
+				ObjectMeta: metav1.ObjectMeta{
+					Name: "ing-fail-on-tls-backend",
+				},
+				Spec: extensions.IngressSpec{
+					TLS: []extensions.IngressTLS{
+						{SecretName: "tls-secret-notexist"},
+					},
+					Backend: &extensions.IngressBackend{
+						ServiceName: "echoheaders-notexist",
+						ServicePort: intstr.IntOrString{
+							Type:   intstr.Int,
+							IntVal: 80,
+						},
+					},
+				},
+			}
+			_, err := jig.Client.ExtensionsV1beta1().Ingresses(ns).Create(ingFailTLSBackend)
+			defer func() {
+				if err := jig.Client.ExtensionsV1beta1().Ingresses(ns).Delete(ingFailTLSBackend.Name, nil); err != nil {
+					framework.Logf("Failed to delete ingress %s: %v", ingFailTLSBackend.Name, err)
+				}
+			}()
+			Expect(err).NotTo(HaveOccurred())
+
+			ingFailRules := &extensions.Ingress{
+				ObjectMeta: metav1.ObjectMeta{
+					Name: "ing-fail-on-rules",
+				},
+				Spec: extensions.IngressSpec{
+					Rules: []extensions.IngressRule{
+						{
+							Host: "foo.bar.com",
+							IngressRuleValue: extensions.IngressRuleValue{
+								HTTP: &extensions.HTTPIngressRuleValue{
+									Paths: []extensions.HTTPIngressPath{
+										{
+											Path: "/foo",
+											Backend: extensions.IngressBackend{
+												ServiceName: "echoheaders-notexist",
+												ServicePort: intstr.IntOrString{
+													Type:   intstr.Int,
+													IntVal: 80,
+												},
+											},
+										},
+									},
+								},
+							},
+						},
+					},
+				},
+			}
+			_, err = jig.Client.ExtensionsV1beta1().Ingresses(ns).Create(ingFailRules)
+			defer func() {
+				if err := jig.Client.ExtensionsV1beta1().Ingresses(ns).Delete(ingFailRules.Name, nil); err != nil {
+					framework.Logf("Failed to delete ingress %s: %v", ingFailRules.Name, err)
+				}
+			}()
+			Expect(err).NotTo(HaveOccurred())
+
+			By("Creating a basic HTTP ingress and wait for it to come up")
+			jig.CreateIngress(filepath.Join(framework.IngressManifestPath, "http"), ns, nil, nil)
+			jig.WaitForIngress(true)
+
+			By("Updating the path on ingress and wait for it to take effect")
+			jig.Update(func(ing *extensions.Ingress) {
+				updatedRule := extensions.IngressRule{
+					Host: "ingress.test.com",
+					IngressRuleValue: extensions.IngressRuleValue{
+						HTTP: &extensions.HTTPIngressRuleValue{
+							Paths: []extensions.HTTPIngressPath{
+								{
+									Path: "/test",
+									// Copy backend from the first rule.
+									Backend: ing.Spec.Rules[0].HTTP.Paths[0].Backend,
+								},
+							},
+						},
+					},
+				}
+				// Replace the first rule.
+				ing.Spec.Rules[0] = updatedRule
+			})
+			// Wait for change to take effect on the updated ingress.
+			jig.WaitForIngress(false)
+		})
+
 		It("multicluster ingress should get instance group annotation", func() {
 			name := "echomap"
 			jig.CreateIngress(filepath.Join(framework.IngressManifestPath, "http"), ns, map[string]string{