func TestUTCFlag(t *testing.T) {
    var b bytes.Buffer
    l := New(&b, "Test:", LstdFlags)
    l.SetFlags(Ldate | Ltime | LUTC)
    // Verify a log message looks right in the right time zone. Quantize to the second only.
    now := time.Now().UTC()
    l.Print("hello")
    want := fmt.Sprintf("Test:%d/%.2d/%.2d %.2d:%.2d:%.2d hello\n",
        now.Year(), now.Month(), now.Day(), now.Hour(), now.Minute(), now.Second())
    got := b.String()
    if got == want {
        return
    }
    // It's possible we crossed a second boundary between getting now and logging,
    // so add a second and try again. This should very nearly always work.
    now.Add(time.Second)
    want = fmt.Sprintf("Test:%d/%.2d/%.2d %.2d:%.2d:%.2d hello\n",
        now.Year(), now.Month(), now.Day(), now.Hour(), now.Minute())
    if got == want {
        return
    }
    t.Errorf("got %q; want %q", got, want)
}