diff --git a/test/fixtures/markdown-it/commonmark_extras.txt b/test/fixtures/markdown-it/commonmark_extras.txt
index c168431..a3477dd 100644
--- a/test/fixtures/markdown-it/commonmark_extras.txt
+++ b/test/fixtures/markdown-it/commonmark_extras.txt
@@ -106,16 +106,7 @@ Autolinks do not allow escaping:
 .
 
 
-Should not throw exception on mailformed URI
-.
-[foo](<&#x25;test>)
-.
-<p><a href="%25test">foo</a></p>
-.
-
-
 Multiline title in definitions:
-
 .
 [foo]: test '
 1
diff --git a/test/fixtures/markdown-it/fatal.txt b/test/fixtures/markdown-it/fatal.txt
new file mode 100644
index 0000000..28831ae
--- /dev/null
+++ b/test/fixtures/markdown-it/fatal.txt
@@ -0,0 +1,26 @@
+Should not throw exception on mailformed URI
+.
+[foo](<&#x25;test>)
+.
+<p><a href="%25test">foo</a></p>
+.
+
+
+
+Should not hang comments regexp
+.
+foo <!--- xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx ->
+
+foo <!------------------------------------------------------------------->
+.
+<p>foo &lt;!— xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx -&gt;</p>
+<p>foo &lt;!-------------------------------------------------------------------&gt;</p>
+.
+
+
+Should not hang cdata regexp
+.
+foo <![CDATA[ xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx ]>
+.
+<p>foo &lt;![CDATA[ xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx ]&gt;</p>
+.
\ No newline at end of file