[glib/nonchar-testcase2] Add another Unicode testcase

[Matthias Clasen <matthiasc src gnome org>]

commit ad3c339ce4c4a190a04befd15fbaa4981a9ab938
Author: Matthias Clasen <mclasen redhat com>
Date:   Thu May 19 12:38:14 2022 -0400

    Add another Unicode testcase
    
    It turns out I typoed the character code when
    I added the previous one.
    
    See https://gitlab.gnome.org/GNOME/glib/-/merge_requests/2669

 glib/tests/string.c | 5 +++++
 1 file changed, 5 insertions(+)
---
diff --git a/glib/tests/string.c b/glib/tests/string.c
index 7d76f312f6..0ea9f7bbb6 100644
--- a/glib/tests/string.c
+++ b/glib/tests/string.c
@@ -381,6 +381,11 @@ test_string_insert_unichar (void)
   g_string_insert_unichar (string, -1, 0xFFD0);
   g_assert_cmpstr (string->str, ==, "start\xEF\xBF\x90");
   g_string_free (string, TRUE);
+
+  string = g_string_new ("start");
+  g_string_insert_unichar (string, -1, 0xFDD0);
+  g_assert_cmpstr (string->str, ==, "start\xEF\xB7\x90");
+  g_string_free (string, TRUE);
 }
 
 static void