assertTrue(permissionDenied.getMessage().contains("Permission denied"));

        // Scenario 4: Exit code error
        CommandExecutionException exitCodeError = new CommandExecutionException("Command exited with non-zero code: 127");
        assertTrue(exitCodeError.getMessage().contains("non-zero code"));
    }

 * requested entries may be evicted on each cache modification.
 *
 * <p>If {@link #expireAfterWrite expireAfterWrite} or {@link #expireAfterAccess expireAfterAccess}
 * is requested entries may be evicted on each cache modification, on occasional cache accesses, or
 * on calls to {@link Cache#cleanUp}. Expired entries may be counted by {@link Cache#size}, but will

    }

    public void test_expired_method_exists() throws Exception {
        assertNotNull("expired method should exist", SystemMonitorTarget.class.getMethod("expired"));
    }

    public void test_expired_method_can_be_called() {
        // Instead of directly calling expired() which may fail due to system dependencies
        // in test environments, we test that the method exists and can be invoked

    }

    public void test_getType_immutability() {
        // Test that getType returns the same value consistently
        String type = "ApiKey";
        String message = "API key expired";
        InvalidAccessTokenException exception = new InvalidAccessTokenException(type, message);

        String firstCall = exception.getType();
        String secondCall = exception.getType();

        assertFalse(thumbnailManager.generating);
    }

    // Test purge with expired files
    public void test_purge_withExpiredFiles() throws IOException {
        // Create test files
        File dir1 = new File(tempDir, "_1");
        dir1.mkdirs();
        File expiredFile = new File(dir1, "expired.png");
        expiredFile.createNewFile();

    /**
     * Default constructor for HotThreadMonitorTarget.
     */
    public HotThreadMonitorTarget() {
        super();
    }

    @Override
    public void expired() {
        final StringBuilder buf = new StringBuilder(1000);

        buf.append("[HOTTHREAD MONITOR] ");

        final FessConfig fessConfig = ComponentUtil.getFessConfig();

        buf.append('{');

      // (Or it's a weird case like a LinkedList in a Cache<ArrayList, ...>, but *shrug*.)
      @SuppressWarnings("unchecked")
      K castKey = (K) key;
      alertListenerIfPresent(castKey, value.getValue(), RemovalCause.EXPIRED);
      cachingHashMap.remove(key);
      return null;
    }
  }

  @CanIgnoreReturnValue
  @Override
  public V put(K key, V value) {
    checkNotNull(key);
    checkNotNull(value);

                FessActionValidator.class.getName());
    }

    public void test_inheritance() {
        assertTrue("FessActionValidator should extend ActionValidator", ActionValidator.class.isAssignableFrom(FessActionValidator.class));
    }

    public void test_constructorExists() {
        // Verify constructor exists with expected parameters
        try {

    /** Parameter key for controlling deletion of old documents */
    private static final String DELETE_OLD_DOCS = "delete_old_docs";

    /** Parameter key for controlling retention of expired documents */
    private static final String KEEP_EXPIRES_DOCS = "keep_expires_docs";

    /**
     * Interval in milliseconds between crawler thread executions.

    }

    public void test_inheritance() {
        // Verify that FessWebResourceRoot extends StandardRoot
        assertTrue("FessWebResourceRoot should extend StandardRoot", StandardRoot.class.isAssignableFrom(FessWebResourceRoot.class));
        assertTrue("FessWebResourceRoot should implement WebResourceRoot",