return null;
            }

            @Override
            public void setInitParameterMap(final Map<String, Object> params) {
                buf.append("value=").append(params.get("hoge"));
            }

        });

        clientFactory.setInitParameterMap(paramMap);

        assertEquals("value=test", buf.toString());
    }

    public void test_getClient_null() {

        CrawlerClientFactory crawlerClientFactory = webConfig.initializeClientFactory(() -> new CrawlerClientFactory() {
            public void setInitParameterMap(final Map<String, Object> params) {
                initParamMapSet.set(params);
            }
        });
        assertNotNull(crawlerClientFactory);
        Map<String, Object> initParamMap = initParamMapSet.get();

     * @param params The map of parameters.
     */
    public void setInitParameterMap(final Map<String, Object> params) {
        if (params != null) {
            for (final CrawlerClient client : clientMap.values()) {
                client.setInitParameterMap(params);
            }
        }
    }

    /**
     * Sets the client map.

     */
    @Override
    public void setInitParameterMap(final Map<String, Object> params) {
        this.params.putAll(params);
    }

    /**
     * Initializes the parameter map of the wrapped factory with the parameters stored in this wrapper.
     */
    public void initParameterMap() {
        factory.setInitParameterMap(params);
    }

    /**
     * Initializes the wrapped factory.

    /**
     * Sets the initialization parameters for the underlying CrawlerClient.
     *
     * @param params a map of parameter names and values to be set
     */
    public void setInitParameterMap(final Map<String, Object> params) {
        client.setInitParameterMap(params);
    }

    /**
     * Executes the request with retry logic.
     * @param request The request data.
     * @return The response data.
     */
    @Override

    /**
     * Sets the initialization parameters for the crawler client.
     *
     * @param params a map containing the initialization parameters
     */
    void setInitParameterMap(Map<String, Object> params);

    /**
     * Executes a request and returns the response data.
     *
     * @param data the request data to be executed
     * @return the response data from the executed request

        }
        return (T) value;
    }

    /**
     * Sets the initialization parameter map.
     * @param params The map of parameters.
     */
    @Override
    public void setInitParameterMap(final Map<String, Object> params) {
        initParamMap = params;
    }

    /**
     * Executes the request based on the HTTP method.
     * @param request The request data.