Issue #6697: Fixed instances of _PyUnicode_AsString() result not checked for NULL
diff --git a/Lib/test/test_pyexpat.py b/Lib/test/test_pyexpat.py
index 5a193bb..5bb8c97 100644
--- a/Lib/test/test_pyexpat.py
+++ b/Lib/test/test_pyexpat.py
@@ -203,6 +203,8 @@
 
         operations = out.out
         self._verify_parse_output(operations)
+        # Issue #6697.
+        self.assertRaises(AttributeError, getattr, parser, '\uD800')
 
     def test_parse_file(self):
         # Try parsing a file