diff --git a/tests/test_string.cpp b/tests/test_string.cpp
index 0ade0113..1bd29ff5 100644
--- a/tests/test_string.cpp
+++ b/tests/test_string.cpp
@@ -350,6 +350,9 @@ public:
     CPPUNIT_ASSERT(String(ByteVector("\xFC\x80\x80\x80\x80\x80"), String::UTF8).isEmpty());
 
     CPPUNIT_ASSERT(String('\x80', String::UTF8).isEmpty());
+
+    CPPUNIT_ASSERT(String(ByteVector("\xED\xA0\x80\xED\xB0\x80"), String::UTF8).isEmpty());
+    CPPUNIT_ASSERT(String(ByteVector("\xED\xB0\x80\xED\xA0\x80"), String::UTF8).isEmpty());
   }
 
 };