assertTrue(result.contains("italic text"));
    }

    @Test
    public void test_render_heading1() {
        String result = markdownRenderer.render("# Heading 1");
        assertTrue(result.contains("<h1>Heading 1</h1>"));
    }

    @Test
    public void test_render_heading2() {
        String result = markdownRenderer.render("## Heading 2");
        assertTrue(result.contains("<h2>Heading 2</h2>"));