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

        // trans2 fails first (lower fail count, tried first), trans1 succeeds
        when(trans2.unwrap(SmbTransportImpl.class)).thenReturn(trans2);
        when(trans2.ensureConnected()).thenThrow(new IOException("Connection failed"));

     *
     * @param thumbnailId the identifier for the thumbnail being generated
     * @param cmdList the list of command arguments to execute
     * @return the exit code of the process if it finishes normally; -1 if the process fails or is terminated
     */
    protected int executeCommand(final String thumbnailId, final List<String> cmdList) {
        ProcessDestroyer task = null;
        Process p = null;
        InputStreamThread ist = null;

    }

    /**
     * Executes the suggest creator process.
     * This method constructs the command line arguments and starts the process.
     * @throws JobProcessingException if the process fails.
     */
    protected void executeSuggestCreator() {
        final List<String> cmdList = new ArrayList<>();
        final String cpSeparator = SystemUtils.IS_OS_WINDOWS ? ";" : ":";

 * and access mask are considered. If the ACE is a "deny"
 * ACE and <i>any</i> of the desired access bits match bits in the access
 * mask of the ACE, the whole access check fails. If the ACE is an "allow"
 * ACE and <i>all</i> of the bits in the desired access bits match bits in
 * the access mask of the ACE, the access check is successful. Otherwise,

    void testClose_throwsException() {
        doThrow(new RuntimeException("Failed to close")).when(smbTree).close();

        assertThrows(RuntimeException.class, () -> smbTree.close(), "Should propagate exception when close fails");
    }

    /**
     * Test for AutoCloseable functionality.
     * Verifies that SmbTree can be used in try-with-resources.
     */
    @Test
    void testAutoCloseable() {

     * Sets up the classpath, JVM options, and command line arguments
     * to launch the ThumbnailGenerator in a separate process.
     *
     * @throws JobProcessingException if the thumbnail generation process fails
     */
    protected void executeThumbnailGenerator() {
        final List<String> cmdList = new ArrayList<>();
        final String cpSeparator = SystemUtils.IS_OS_WINDOWS ? ";" : ":";

    assertEquals(0, numCalls.get());
    reject.set(false);
    executor.execute(task);
    assertEquals(1, numCalls.get());
  }

  /*
   * Under Android, MyError propagates up and fails the test?
   *
   * TODO(b/218700094): Does this matter to prod users, or is it just a feature of our testing
   * environment? If the latter, maybe write a custom Executor that avoids failing the test when it

            verify(response, never()).setStatus(HttpServletResponse.SC_UNAUTHORIZED);
        }
    }

    /**
     * Test the service method with NTLM authentication that fails.
     * Expects a 401 Unauthorized response.
     * @throws ServletException
     * @throws IOException
     * @throws CIFSException
     */
    @Test
    void testService_NtlmAuth_Failure() throws Exception {

    }

    @Test
    void testConstructorWithDecryptionFailure() throws IOException, GeneralSecurityException {
        // Test when decryption fails
        byte[] token = createTestTicketBytes(new BigInteger(KerberosConstants.KERBEROS_VERSION), SERVER_REALM, SERVER_PRINCIPAL_NAME,
                ENCRYPTION_TYPE, ENCRYPTED_DATA, null);

        when(handle.getFid()).thenReturn(fid);
        when(tree.send(any(CommonServerMessageBlockRequest.class), any(), any(), any())).thenReturn(resp);
    }

    // Ensures watch() fails fast if the underlying handle is invalid
    @Test
    @DisplayName("watch() throws when handle invalid")
    void watch_invalidHandle_throwsSmbException() throws Exception {
        when(handle.isValid()).thenReturn(false);