From 48a34aa2cc2ae321af47787ab99197afd3219611 Mon Sep 17 00:00:00 2001
From: Skgland <bennet.blessmann+github@googlemail.com>
Date: Thu, 30 Apr 2026 19:01:34 +0200
Subject: [PATCH] add a test with bad utf-8

---
 src/parser/char_reader.rs | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/src/parser/char_reader.rs b/src/parser/char_reader.rs
index 1ad6971e..caffc7c1 100644
--- a/src/parser/char_reader.rs
+++ b/src/parser/char_reader.rs
@@ -380,6 +380,33 @@ mod tests {
         assert!(read_string.read_char().is_none());
     }
 
+    #[test]
+    fn interspersed_bad_utf8() {
+        let mut read_string = CharReader::new(Cursor::new(b"a string\xffmore_text\xff"));
+
+        for c in "a string".chars() {
+            assert_eq!(read_string.peek_char().unwrap().ok(), Some(c));
+            assert_eq!(read_string.read_char().unwrap().ok(), Some(c));
+        }
+
+        assert_eq!(
+            read_string.peek_char().unwrap().unwrap_err().kind(),
+            std::io::ErrorKind::InvalidData
+        );
+
+        for c in "more_text".chars() {
+            assert_eq!(read_string.peek_char().unwrap().ok(), Some(c));
+            assert_eq!(read_string.read_char().unwrap().ok(), Some(c));
+        }
+
+        assert_eq!(
+            read_string.peek_char().unwrap().unwrap_err().kind(),
+            std::io::ErrorKind::InvalidData
+        );
+
+        assert!(read_string.read_char().is_none());
+    }
+
     #[test]
     fn greek_string() {
         let mut read_string = CharReader::new(Cursor::new("λέξη"));
-- 
2.54.0