assertEquals("https://test.com", source.getUrl());
        assertEquals("id-456", source.getDocId());
        assertEquals("A short snippet", source.getSnippet());
    }

    @Test
    public void test_htmlContent_defaultValue() {
        final ChatMessage message = new ChatMessage();
        assertNull(message.getHtmlContent());
    }

    @Test
    public void test_htmlContent_setAndGet() {