Add fuzzy-test for dc_mimeparser_parser

src/dc_mimeparser.rs

@@ -1546,6 +1546,7 @@ pub unsafe fn mailimf_find_optional_field(
 mod tests {
     use super::*;
     use crate::test_utils::*;
+    use proptest::prelude::*;
     use std::ffi::CStr;
 
     #[test]
@@ -1630,6 +1631,14 @@ mod tests {
         assert_eq!(mimeparser.parts.len(), 1);
     }
 
+    proptest! {
+        #[test]
+        fn test_dc_mailmime_parse_crash_fuzzy(data in "[!-~\t ]{2000,}") {
+            let context = dummy_context();
+            unsafe { dc_mimeparser_parse(&context.ctx, data.as_bytes()) }
+        }
+    }
+
     #[test]
     fn test_mimeparser_with_context() {
         unsafe {