public void test_htmlContent_withAssistantMessage() {
        final ChatMessage message = ChatMessage.assistantMessage("# Title\n\nParagraph");
        message.setHtmlContent("<h1>Title</h1><p>Paragraph</p>");

        assertEquals("# Title\n\nParagraph", message.getContent());
        assertEquals("<h1>Title</h1><p>Paragraph</p>", message.getHtmlContent());
    }

    @Test
    public void test_htmlContent_setNull() {

            if (propertyDoc.getDescription() == null) {
                throw new RuntimeException(String.format("Docbook content for '%s.%s' does not contain a description paragraph.", classDoc.getName(), propName));
            }

            props.put(propName, propertyDoc);
        }

        for (PropertyDoc propertyDoc : props.values()) {

                if (methodDoc.getDescription() == null) {
                    throw new RuntimeException(String.format("Docbook content for '%s %s' does not contain a description paragraph.", classDoc.getName(), method.getSignature()));
                }
                PropertyDoc property = classDoc.findProperty(methodName);
                boolean multiValued = false;