String result = markdownRenderer.render("~~strikethrough~~");
        // Just verify it doesn't break
        assertNotNull(result);
    }

    @Test
    public void test_render_nestedLists() {
        String markdown = "- Item 1\n  - Nested 1\n  - Nested 2\n- Item 2";
        String result = markdownRenderer.render(markdown);
        assertTrue(result.contains("<ul>"));