* @return a new user message
     */
    public static ChatMessage userMessage(final String content) {
        return new ChatMessage(ROLE_USER, content);
    }

    /**
     * Creates an assistant message with the specified content.
     *
     * @param content the message content
     * @return a new assistant message
     */
    public static ChatMessage assistantMessage(final String content) {

        session.trimHistory(3);

        final List<ChatMessage> messages = session.getMessages();
        assertEquals(4, messages.size());
        assertEquals(ChatMessage.ROLE_USER, messages.get(0).getRole());
        assertEquals("User 2", messages.get(0).getContent());
        assertEquals(ChatMessage.ROLE_ASSISTANT, messages.get(1).getRole());

     */
    public void addUserMessage(final String content) {
        addMessage(ChatMessage.userMessage(content));
    }

    /**
     * Adds an assistant message to this session.
     *
     * @param content the message content
     */
    public void addAssistantMessage(final String content) {
        addMessage(ChatMessage.assistantMessage(content));
    }

    /**

    }

    @Test
    public void test_isUser() {
        final ChatMessage userMessage = new ChatMessage(ChatMessage.ROLE_USER, "test");
        final ChatMessage assistantMessage = new ChatMessage(ChatMessage.ROLE_ASSISTANT, "test");
        final ChatMessage unknownMessage = new ChatMessage("unknown", "test");

        assertTrue(userMessage.isUser());
        assertFalse(assistantMessage.isUser());

import java.util.stream.Collectors;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.codelibs.core.lang.StringUtil;
import org.codelibs.fess.entity.ChatMessage;
import org.codelibs.fess.entity.ChatMessage.ChatSource;
import org.codelibs.fess.entity.ChatSession;
import org.codelibs.fess.entity.FacetInfo;
import org.codelibs.fess.entity.GeoInfo;
import org.codelibs.fess.entity.HighlightInfo;

import java.io.StringWriter;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.codelibs.fess.Constants;
import org.codelibs.fess.entity.ChatMessage.ChatSource;
import org.codelibs.fess.entity.FacetQueryView;
import org.codelibs.fess.helper.ViewHelper;
import org.codelibs.fess.mylasta.direction.FessConfig;
import org.codelibs.fess.unit.UnitFessTestCase;