t.Fatal(err)
	}
	if from != nil {
		t.Fatalf("unexpected peer address: %v", from)
	}
	if !bytes.Equal(b[:n], data[:]) {
		t.Fatalf("got %v; want %v", b[:n], data[:])
	}
}

func TestUnixgramZeroBytePayload(t *testing.T) {
	if !testableNetwork("unixgram") {
		t.Skip("unixgram test")
	}

	c1 := newLocalPacketListener(t, "unixgram")
	defer os.Remove(c1.LocalAddr().String())
	defer c1.Close()