jdk-24/test/jdk/java/net/MulticastSocket/SendPortZero.java

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import org.testng.annotations.AfterTest;
import org.testng.annotations.BeforeTest;
import org.testng.annotations.DataProvider;
import org.testng.annotations.Test;

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.MulticastSocket;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.MulticastSocket;
import java.net.SocketException;
import java.nio.channels.DatagramChannel;

import static org.testng.Assert.assertThrows;

/*
 * @test
 * @bug 8243408
 * @summary Check that MulticastSocket throws expected
 *          Exception when sending a DatagramPacket with port 0
 * @run testng/othervm SendPortZero
 */

public class SendPortZero {
    private InetAddress loopbackAddr, wildcardAddr;
    private MulticastSocket multicastSocket;
    private DatagramPacket loopbackZeroPkt, wildcardZeroPkt, wildcardValidPkt;

    private static final Class<SocketException> SE = SocketException.class;

    @BeforeTest
    public void setUp() throws IOException {
        multicastSocket = new MulticastSocket();

        byte[] buf = "test".getBytes();

        // Addresses
        loopbackAddr = InetAddress.getLoopbackAddress();
        wildcardAddr = new InetSocketAddress(0).getAddress();

        // Packets
        // loopback w/port 0
        loopbackZeroPkt = new DatagramPacket(buf, 0, buf.length);
        loopbackZeroPkt.setAddress(loopbackAddr);
        loopbackZeroPkt.setPort(0);

        // wildcard w/port 0
        wildcardZeroPkt = new DatagramPacket(buf, 0, buf.length);
        wildcardZeroPkt.setAddress(wildcardAddr);
        wildcardZeroPkt.setPort(0);

        // wildcard addr w/valid port
        // Not currently tested. See JDK-8236807
        wildcardValidPkt = new DatagramPacket(buf, 0, buf.length);
        wildcardValidPkt.setAddress(wildcardAddr);
        wildcardValidPkt.setPort(multicastSocket.getLocalPort());
    }

    @DataProvider(name = "data")
    public Object[][] variants() {
        return new Object[][]{
                { multicastSocket,       loopbackZeroPkt },
                { multicastSocket,       wildcardZeroPkt },
                // Not currently tested. See JDK-8236807
                //{ multicastSocket,       wildcardValidPkt }
        };
    }

    @Test(dataProvider = "data")
    public void testSend(MulticastSocket ms, DatagramPacket pkt) {
        assertThrows(SE, () -> ms.send(pkt));
        assertThrows(SE, () -> ms.send(pkt, (byte) 0));
    }

    @AfterTest
    public void tearDown() {
        multicastSocket.close();
    }
}