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moby--moby/integration-cli/docker_cli_attach_test.go

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package main
import (
"os/exec"
"strings"
"sync"
"testing"
"time"
)
func TestMultipleAttachRestart(t *testing.T) {
cmd := exec.Command(dockerBinary, "run", "--name", "attacher", "-d", "busybox",
"/bin/sh", "-c", "sleep 2 && echo hello")
group := sync.WaitGroup{}
group.Add(4)
defer func() {
cmd = exec.Command(dockerBinary, "kill", "attacher")
if _, err := runCommand(cmd); err != nil {
t.Fatal(err)
}
deleteAllContainers()
}()
go func() {
defer group.Done()
out, _, err := runCommandWithOutput(cmd)
if err != nil {
t.Fatal(err, out)
}
}()
time.Sleep(500 * time.Millisecond)
for i := 0; i < 3; i++ {
go func() {
defer group.Done()
c := exec.Command(dockerBinary, "attach", "attacher")
out, _, err := runCommandWithOutput(c)
if err != nil {
t.Fatal(err, out)
}
if actual := strings.Trim(out, "\r\n"); actual != "hello" {
t.Fatalf("unexpected output %s expected hello", actual)
}
}()
}
group.Wait()
logDone("attach - multiple attach")
}