package main import ( "bytes" "os/exec" "testing" ) func TestLoginWithoutTTY(t *testing.T) { cmd := exec.Command(dockerBinary, "login") // Send to stdin so the process does not get the TTY cmd.Stdin = bytes.NewBufferString("buffer test string \n") // run the command and block until it's done if err := cmd.Run(); err == nil { t.Fatal("Expected non nil err when loginning in & TTY not available") } logDone("login - login without TTY") }