### Question:
DomainSocket implements Closeable { public static DomainSocket connect(String path) throws IOException { if (loadingFailureReason != null) { throw new UnsupportedOperationException(loadingFailureReason); } int fd = connect0(path); return new DomainSocket(path, fd); } private  DomainSocket(String path, int fd); static String getLoadingFailureReason(); @VisibleForTesting static void disableBindPathValidation(); static String getEffectivePath(String path, int port); static DomainSocket bindAndListen(String path); DomainSocket accept(); static DomainSocket connect(String path); boolean isOpen(); String getPath(); DomainInputStream getInputStream(); DomainOutputStream getOutputStream(); DomainChannel getChannel(); void setAttribute(int type, int size); int getAttribute(int type); @Override void close(); void sendFileDescriptors(FileDescriptor jfds[],
      byte jbuf[], int offset, int length); int receiveFileDescriptors(FileDescriptor[] jfds,
      byte jbuf[], int offset, int length); int recvFileInputStreams(FileInputStream[] fis, byte buf[],
        int offset, int length); @Override String toString(); static final int SND_BUF_SIZE; static final int RCV_BUF_SIZE; static final int SND_TIMEO; static final int RCV_TIMEO; }### Answer:
@Test(timeout=180000) public void testInvalidOperations() throws IOException { try { DomainSocket.connect( new File(sockDir.getDir(), "test_sock_invalid_operation"). getAbsolutePath()); } catch (IOException e) { GenericTestUtils.assertExceptionContains("connect(2) error: ", e); } }