Add a test for TcpKeepalivePacketDataParcelable.toString().

        assertEquals(resultData.rcvWndScale, wndScale);

        assertEquals(resultData.tos, tos);

        assertEquals(resultData.ttl, ttl);

        final String expected = ""

                + "android.net.TcpKeepalivePacketDataParcelable{srcAddress: [10, 0, 0, 1],"

                + " srcPort: 1234, dstAddress: [10, 0, 0, 5], dstPort: 4321, seq: 286331153,"

                + " ack: 572662306, rcvWnd: 48000, rcvWndScale: 2, tos: 4, ttl: 64}";

        assertEquals(expected, resultData.toString());

    }

}