feat: add tests for special IP in --add-host flag

Signed-off-by: Ziwen Ning <[email protected]>

tests/run.go

@@ -4,8 +4,11 @@
 package tests
 
 import (
+	"context"
 	"encoding/json"
 	"fmt"
+	"io"
+	"net/http"
 	"os"
 	"path/filepath"
 	"strings"
@@ -327,6 +330,23 @@ func Run(o *RunOption) {
 				gomega.Expect(mapping).Should(gomega.ContainSubstring("test-host"))
 			})
 
+			ginkgo.It("should add a custom host-to-IP mapping with --add-host flag with special IP", func() {
+				response := "This is the expected response for --add-host special IP test."
+				http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
+					io.WriteString(w, response)
+				})
+				hostPort := fnet.GetFreePort()
+				s := http.Server{Addr: fmt.Sprintf(":%d", hostPort), Handler: nil}
+				go s.ListenAndServe()
+				ginkgo.DeferCleanup(s.Shutdown, context.Background())
+				command.Run(o.BaseOpt, "run", "-d", "--name", testContainerName, "--add-host", "test-host:host-gateway", amazonLinux2Image, "sleep", "infinity")
+				mapping := command.StdoutStr(o.BaseOpt, "exec", testContainerName, "cat", "/etc/hosts")
+				gomega.Expect(mapping).Should(gomega.ContainSubstring("192.168.5.2"))
+				gomega.Expect(mapping).Should(gomega.ContainSubstring("test-host"))
+				gomega.Expect(command.StdoutStr(o.BaseOpt, "exec", testContainerName, "curl",
+					fmt.Sprintf("test-host:%d", hostPort))).Should(gomega.Equal(response))
+			})
+
 			for _, publish := range []string{"-p", "--publish"} {
 				publish := publish
 				ginkgo.It(fmt.Sprintf("port of the container should be published to the host port with %s flag", publish), func() {

tests/tests.go

@@ -27,6 +27,7 @@ import (
 const (
 	alpineImage              = "public.ecr.aws/docker/library/alpine:latest"
 	olderAlpineImage         = "public.ecr.aws/docker/library/alpine:3.13"
+	amazonLinux2Image        = "public.ecr.aws/amazonlinux/amazonlinux:2"
 	testImageName            = "test:tag"
 	nonexistentImageName     = "ne-repo:ne-tag"
 	nonexistentContainerName = "ne-ctr"