test: link in heading

Author: ChristianMurphy

tests/fuzz.rs

@@ -98,5 +98,11 @@ fn fuzz() -> Result<(), String> {
         "8-d: autolink literals after tabs (GH-18)"
     );
 
+    assert_eq!(
+        to_html("[:]:   ]:   \n-\n-[:]:   ]:   \n-\n-a"),
+        "<h2>-\n-<a href=\"%5D:\">:</a>:   ]:</h2>\n<p>-a</p>",
+        "9: handle link in heading"
+    );
+
     Ok(())
 }