assertNullPointerException(() -> peer1.listen(1, "127.0.0.1", null));
}
@Test
public void testSendReceive() {
peer1 = vertx.createDatagramSocket(new DatagramSocketOptions());
peer2 = vertx.createDatagramSocket(new DatagramSocketOptions());
peer2.exceptionHandler(t -> fail(t.getMessage()));
peer2.listen(1234, "127.0.0.1", ar -> {
assertTrue(ar.succeeded());
Buffer buffer = TestUtils.randomBuffer(128);
peer2.handler(packet -> {