* @param len the number of bytes to read
     * @return number of bytes read
     * @throws IOException if an I/O error occurs
     */
    public static int readn(final InputStream in, final byte[] b, final int off, final int len) throws IOException {
        int i = 0, n = -5;

        if (off + len > b.length) {
            throw new IOException("Buffer too short, bufsize " + b.length + " read " + len);
        }

        while (i < len) {

        // Both transports fail
        SmbTransportImpl trans1 = mock(SmbTransportImpl.class);
        SmbTransportImpl trans2 = mock(SmbTransportImpl.class);

        IOException firstException = new IOException("First failure");
        IOException secondException = new IOException("Second failure");

        when(trans1.unwrap(SmbTransportImpl.class)).thenReturn(trans1);
        when(trans1.ensureConnected()).thenThrow(firstException);

    private NtlmHttpURLConnection ntlmConnection;

    /**
     * Sets up the mocks and the NtlmHttpURLConnection instance before each test.
     * @throws IOException
     */
    @BeforeEach
    void setUp() throws IOException {
        // Create a real URL instead of mocking to avoid protocol issues
        mockUrl = new URL("http://test.example.com/path");

        SessionRetargetResponsePacket packet = new SessionRetargetResponsePacket();
        byte[] buffer = new byte[6];

        // Assert that an IOException is thrown with the expected message.
        IOException thrown = assertThrows(IOException.class, () -> {
            packet.readTrailerWireFormat(mockInputStream, buffer, 0);
        });

    this.it = readers;
    advance();
  }

  /** Closes the current reader and opens the next one, if any. */
  private void advance() throws IOException {
    close();
    if (it.hasNext()) {
      current = it.next().openStream();
    }
  }

  @Override
  public int read(char[] cbuf, int off, int len) throws IOException {
    checkNotNull(cbuf);

            if (!connected) {
                connect();
            }
            try {
                final Blob blobObj = getBlob();
                if (blobObj == null) {
                    throw new IOException("Object not found: bucket=" + bucketName + ", object=" + objectName);
                }
                return Channels.newInputStream(blobObj.reader());
            } catch (final IOException e) {

     * @return coded bytes of the tagged object
     * @throws IOException if reading fails or tag mismatch
     */
    public static byte[] readUnparsedTagged(final int expectTag, final int limit, final ASN1InputStream in) throws IOException {
        final int ftag = in.read();
        final int tag = readTagNumber(in, ftag);
        if (tag != expectTag) {
            throw new IOException("Unexpected tag " + tag);
        }

import static org.mockito.ArgumentMatchers.any;
import static org.mockito.ArgumentMatchers.anyInt;
import static org.mockito.Mockito.mockStatic;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

import javax.security.auth.kerberos.KerberosKey;
import javax.security.auth.kerberos.KerberosPrincipal;

import org.junit.jupiter.api.BeforeEach;

    }

    @Override
    public String readLine() throws IOException {
        try {
            return prompter.prompt(null);
        } catch (org.apache.maven.api.services.PrompterException e) {
            throw new IOException("Unable to prompt", e);
        }
    }

    @Override
    public String readPassword() throws IOException {
        try {
            return prompter.promptForPassword(null);

        IOException ex = assertThrows(IOException.class, () -> t.parse(null), "parse should throw IOException on null");
        assertTrue(ex.getMessage().toLowerCase().contains("null"));
    }

    @Test
    @DisplayName("toByteArray returns empty when no mechanismToken")
    void toByteArrayWhenNull() {
        TestSpnegoToken t = new TestSpnegoToken();