add test for backendErr

Author: Revolyssup

test/e2e/crds/v2/route.go

@@ -741,7 +741,45 @@ spec:
 			By("send requests to verify zero-weight behavior")
 			for range 30 {
 				code := verifyRequest()
-				fmt.Println(code)
+				Expect(code).Should(Equal(200))
+			}
+		})
+
+		It("valid backend is set even if other backend is invalid", func() {
+			const apisixRouteSpec = `
+apiVersion: apisix.apache.org/v2
+kind: ApisixRoute
+metadata:
+ name: default
+spec:
+ ingressClassName: apisix
+ http:
+ - name: rule1
+   match:
+     hosts:
+     - httpbin.org
+     paths:
+       - /get
+   backends:
+   - serviceName: httpbin-service-e2e-test
+     servicePort: 80
+     weight: 10
+   - serviceName: invalid-service
+     servicePort: 9180
+     weight: 5
+`
+			By("apply ApisixRoute with traffic split")
+			applier.MustApplyAPIv2(types.NamespacedName{Namespace: s.Namespace(), Name: "default"}, new(apiv2.ApisixRoute), apisixRouteSpec)
+			verifyRequest := func() int {
+				return s.NewAPISIXClient().GET("/get").WithHost("httpbin.org").Expect().Raw().StatusCode
+			}
+
+			By("wait for route to be ready")
+			time.Sleep(8 * time.Second)
+			By("send requests to verify all requests routed to valid upstream")
+			for range 30 {
+				code := verifyRequest()
+				Expect(code).Should(Equal(200))
 			}
 		})
 	})