public String getHtmlContent() {
        return htmlContent;
    }

    /**
     * Sets the HTML-rendered content.
     *
     * @param htmlContent the HTML content
     */
    public void setHtmlContent(final String htmlContent) {
        this.htmlContent = htmlContent;
    }

    /**
     * Represents a source document referenced in the chat response.
     */

        message.setHtmlContent(htmlContent);

        assertEquals(htmlContent, message.getHtmlContent());
    }

    @Test
    public void test_htmlContent_withUserMessage() {
        final ChatMessage message = ChatMessage.userMessage("Hello");
        message.setHtmlContent("<p>Hello</p>");

        assertEquals("Hello", message.getContent());

            // Create and save assistant message (user message was already added at the start)
            final ChatMessage assistantMessage = ChatMessage.assistantMessage(fullResponse.toString());
            assistantMessage.setHtmlContent(htmlContent);

            for (int i = 0; i < sources.size(); i++) {
                populateUrlLink(sources.get(i));
            }