diff --git a/tests/test_port/fixtures/alerts.md b/tests/test_port/fixtures/alerts.md
index 4a4b0833..dbcf7aca 100644
--- a/tests/test_port/fixtures/alerts.md
+++ b/tests/test_port/fixtures/alerts.md
@@ -170,3 +170,20 @@ Alert with list
 </ul>
 </div>
 .
+
+Fence in alert
+.
+> [!NOTE]  
+> Note
+>
+> ```py
+> code
+> ```
+.
+<div class="markdown-alert markdown-alert-note">
+<p class="markdown-alert-title">Note</p>
+<p>Note</p>
+<pre><code class="language-py">code
+</code></pre>
+</div>
+.