test/jdk/java/net/ServerSocket/ClosedServerSocketTest.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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import java.io.IOException;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.ServerSocket;
import java.net.SocketException;
import java.net.StandardSocketOptions;

import org.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.assertThrows;
import static org.junit.jupiter.api.Assertions.assertThrowsExactly;
import static org.junit.jupiter.api.Assertions.assertTrue;

/*
 * @test
 * @summary verifies that the APIs on java.net.ServerSocket throw expected exceptions
 *          when invoked on a closed ServerSocket
 * @run junit ClosedServerSocketTest
 */
public class ClosedServerSocketTest {

    private static final InetAddress loopback = InetAddress.getLoopbackAddress();
    private static final InetSocketAddress loopbackEphemeral = new InetSocketAddress(loopback, 0);

    /**
     * Verifies that various operations that specify to throw an IOException on a
     * closed ServerSocket, do indeed throw it.
     */
    @Test
    public void testIOExceptionThrown() throws Exception {
        try (final ServerSocket ss = new ServerSocket()) {
            // close and then invoke the operations on the ServerSocket
            ss.close();
            assertTrue(ss.isClosed(), "ServerSocket isn't closed");
            assertThrows(IOException.class,
                    ss::accept,
                    "accept() when already closed didn't throw IOException");
            assertThrows(IOException.class,
                    () -> ss.bind(loopbackEphemeral),
                    "bind() when already closed didn't throw IOException");
            assertThrows(IOException.class,
                    () -> ss.bind(loopbackEphemeral, 10),
                    "bind(SocketAddress, int) when already closed didn't throw IOException");
            assertThrows(IOException.class,
                    () -> ss.getOption(StandardSocketOptions.SO_RCVBUF),
                    "getOption() when already closed didn't throw IOException");
            assertThrows(IOException.class,
                    ss::getSoTimeout,
                    "getSoTimeout() when already closed didn't throw IOException");
            assertThrows(IOException.class,
                    () -> ss.setOption(StandardSocketOptions.SO_RCVBUF, 1024),
                    "setOption() when already closed didn't throw IOException");
        }
    }

    /**
     * Verifies that various operations that specify to throw a SocketOperation on a
     * closed ServerSocket, do indeed throw it.
     */
    @Test
    public void testSocketExceptionThrown() throws Exception {
        try (final ServerSocket ss = new ServerSocket()) {
            // close and then invoke the operations on the ServerSocket
            ss.close();
            assertTrue(ss.isClosed(), "ServerSocket isn't closed");
            assertThrowsExactly(SocketException.class,
                    ss::getReceiveBufferSize,
                    "getReceiveBufferSize() when already closed didn't throw SocketException");
            assertThrowsExactly(SocketException.class,
                    ss::getReuseAddress,
                    "getReuseAddress() when already closed didn't throw SocketException");
            assertThrowsExactly(SocketException.class,
                    () -> ss.setReceiveBufferSize(1024),
                    "setReceiveBufferSize() when already closed didn't throw SocketException");
            assertThrowsExactly(SocketException.class,
                    () -> ss.setReuseAddress(false),
                    "setReuseAddress() when already closed didn't throw SocketException");
            assertThrowsExactly(SocketException.class,
                    () -> ss.setSoTimeout(1000),
                    "setSoTimeout() when already closed didn't throw SocketException");
        }
    }

    /**
     * Verifies that various operations that aren't expected to throw an exception on a
     * closed ServerSocket, complete normally.
     */
    @Test
    public void testNoExceptionThrown() throws Exception {
        try (final ServerSocket ss = new ServerSocket()) {
            // close and then invoke the operations on the ServerSocket
            ss.close();
            assertTrue(ss.isClosed(), "ServerSocket isn't closed");
            ss.getInetAddress();
            ss.getLocalPort();
            ss.getLocalSocketAddress();
            ss.isBound();
            ss.supportedOptions();
        }
    }
}