* attributes for business methods.
 * <p>
 * For example:
 *
 * <pre>
 * &#064;Secured({ &quot;ROLE_USER&quot; })
 * public void create(Contact contact);
 *
 * &#064;Secured({ &quot;ROLE_USER&quot;, &quot;ROLE_ADMIN&quot; })
 * public void update(Contact contact);
 *
 * &#064;Secured({ &quot;ROLE_ADMIN&quot; })
 * public void delete(Contact contact);
 * </pre>

 * @author FessProject
 */
public class ChatMessage implements Serializable {

    private static final long serialVersionUID = 1L;

    /** The role identifier for user messages. */
    public static final String ROLE_USER = "user";

    /** The role identifier for assistant messages. */
    public static final String ROLE_ASSISTANT = "assistant";

    /** The unique identifier for this message. */
    private String id;

        assertNotNull(message.getSources());
    }

    @Test
    public void test_userMessage() {
        final ChatMessage message = ChatMessage.userMessage("Hello, World!");
        assertEquals(ChatMessage.ROLE_USER, message.getRole());
        assertEquals("Hello, World!", message.getContent());
        assertTrue(message.isUser());
        assertFalse(message.isAssistant());
    }

    @Test

        assertEquals("System prompt", message.getContent());
    }

    @Test
    public void test_userFactory() {
        final LlmMessage message = LlmMessage.user("User question");
        assertEquals(LlmMessage.ROLE_USER, message.getRole());
        assertEquals("User question", message.getContent());
    }

    @Test
    public void test_assistantFactory() {
        final LlmMessage message = LlmMessage.assistant("Assistant response");

        final LlmChatRequest result = request.addUserMessage("User question");

        assertSame(request, result);
        assertEquals(1, request.getMessages().size());
        assertEquals(LlmMessage.ROLE_USER, request.getMessages().get(0).getRole());
        assertEquals("User question", request.getMessages().get(0).getContent());
    }

    @Test
    public void test_addAssistantMessage() {