gistfile1.txt

func (s *DockerDaemonSuite) TestDaemonNoColors(c *check.C) {
    testRequires(c, SameHostDaemon, DaemonIsLinux)

    pty, tty, err := pty.Open()
    c.Assert(err, check.IsNil)
    cmd := exec.Command(dockerBinary, "daemon", "--no-color")
    cmd.Stdin = tty
    cmd.Stdout = tty
    cmd.Stderr = tty
    c.Assert(cmd.Start(), check.IsNil)
    defer cmd.Process.Kill()

    time.Sleep( 5*time.Second )

    buf := make([]byte, 1024)

    _, err = pty.Read(buf)
    c.Assert(err, check.IsNil) //could not read tty output
    c.Assert(string(buf), checker.Contains, "INFO[0000]", check.Commentf("Missing non-color output", buf))
}