* close or flush either object.
   *
   * @param from the object to read from
   * @param to the object to write to
   * @return the number of characters copied
   * @throws IOException if an I/O error occurs
   */
  @CanIgnoreReturnValue
  public static long copy(Readable from, Appendable to) throws IOException {
    // The most common case is that from is a Reader (like InputStreamReader or StringReader) so

   * writer each time it is called.
   *
   * <p>The caller is responsible for ensuring that the returned writer is closed.
   *
   * @throws IOException if an I/O error occurs while opening the writer
   */
  public abstract Writer openStream() throws IOException;

  /**
   * Opens a new buffered {@link Writer} for writing to this sink. The returned stream is not

     *
     * @throws IOException if a network error occurs
     */

    @Override
    public int read(final byte[] b) throws IOException {
        return read(b, 0, b.length);
    }

    /**
     * Reads up to len bytes of data from this input stream into an array of bytes.
     *
     * @throws IOException if a network error occurs
     */

    @Override

        assertThrows(PACDecodingException.class, () -> new KerberosToken(malformedToken));
    }

    /**
     * Test constructor with a token that has an incorrect OID.
     *
     * @throws IOException if an I/O error occurs
     */
    @Test
    void testConstructorWithWrongOid() throws IOException {
        byte[] wrongOidToken = createGssApiWrapper(new ASN1ObjectIdentifier("1.2.3.4.5"), new byte[0]);

   * reader each time it is called.
   *
   * <p>The caller is responsible for ensuring that the returned reader is closed.
   *
   * @throws IOException if an I/O error occurs while opening the reader
   */
  public abstract Reader openStream() throws IOException;

  /**
   * Opens a new {@link BufferedReader} for reading from this source. This method returns a new,

   * reader each time it is called.
   *
   * <p>The caller is responsible for ensuring that the returned reader is closed.
   *
   * @throws IOException if an I/O error occurs while opening the reader
   */
  public abstract Reader openStream() throws IOException;

  /**
   * Opens a new {@link BufferedReader} for reading from this source. This method returns a new,

   * independent stream each time it is called.
   *
   * <p>The caller is responsible for ensuring that the returned stream is closed.
   *
   * @throws IOException if an I/O error occurs while opening the stream
   */
  public abstract OutputStream openStream() throws IOException;

  /**
   * Opens a new buffered {@link OutputStream} for writing to this sink. The returned stream is not

   * independent stream each time it is called.
   *
   * <p>The caller is responsible for ensuring that the returned stream is closed.
   *
   * @throws IOException if an I/O error occurs while opening the stream
   */
  public abstract OutputStream openStream() throws IOException;

  /**
   * Opens a new buffered {@link OutputStream} for writing to this sink. The returned stream is not

     * @return session key of the underlying smb session
     * @throws CIFSException if an error occurs retrieving the session key
     */
    byte[] getSessionKey() throws CIFSException;

    /**
     * Gets the input stream for reading from this pipe.
     *
     * @return this pipe's input stream
     * @throws CIFSException if an error occurs getting the input stream
     */
    @Override

    /**
     * Sets up the test environment before each test.
     * Initializes a mock {@link SmbPipeResource} and a mock implementation of {@link SmbPipeHandle}.
     * @throws CIFSException if an error occurs during setup.
     */
    @BeforeEach
    public void setUp() throws CIFSException {
        mockPipeResource = mock(SmbPipeResource.class);
        mockSmbPipeHandleInternal = mock(SmbPipeHandleInternal.class);