test: two setext headings next to each other

src/util/unicode.rs

@@ -2,7 +2,7 @@
 
 /// List of characters that are considered punctuation.
 ///
-/// > 👉 **Important**: this module is generated by `generate/src/main.rs`.
+/// > 👉 **Important**: this module is generated by `build.rs`.
 /// > It is generate from the latest Unicode data.
 ///
 /// Rust does not contain an `is_punctuation` method on `char`, while it does

tests/fuzz.rs

@@ -129,5 +129,13 @@ fn fuzz() -> Result<(), String> {
         "12: mdx: handle invalid mdx without panic (GH-26)"
     );
 
+    assert!(
+        matches!(
+            to_mdast("=\n=\n=\na\n=", &Default::default()),
+            Ok(mdast::Node::Root(_))
+        ),
+        "yy: setext headings next to each other (GH-31)"
+    );
+
     Ok(())
 }