assertFalse(exception.isAuthenticationError());
        assertTrue(exception.isFileSystemError());
        assertFalse(exception.isTransientError());

        // Transient error
        exception = new SmbOperationException(SmbOperationException.ErrorCode.SERVICE_UNAVAILABLE, "Server busy");
        assertFalse(exception.isNetworkError());
        assertFalse(exception.isAuthenticationError());

        return System.currentTimeMillis() - operationStartTime;
    }

    /**
     * Check if this is a network-related error
     *
     * @return true if network error
     */
    public boolean isNetworkError() {
        return errorCode.getCategory() == ErrorCategory.NETWORK;
    }

    /**
     * Check if this is an authentication error
     *
     * @return true if authentication error
     */