if err != nil {
		t.Fatal("exchange failed:", err)
	}
}

// Issue 27763: verify that two strings in one TXT record are concatenated.
func TestTXTRecordTwoStrings(t *testing.T) {
	fake := fakeDNSServer{
		rh: func(n, _ string, q dnsmessage.Message, _ time.Time) (dnsmessage.Message, error) {
			r := dnsmessage.Message{
				Header: dnsmessage.Header{