1 files changed, 4 insertions, 0 deletions
diff --git a/test/t/string.rb b/test/t/string.rb
index ee969a696..964ec0e63 100644
--- a/test/t/string.rb
+++ b/test/t/string.rb
@@ -5,6 +5,10 @@ assert('String', '15.2.10') do
   String.class == Class
 end
 
+assert('String superclass', '15.2.10.2') do
+  String.superclass == Object
+end
+
 assert('String#*', '15.2.10.5.1') do
   'a' * 5 == 'aaaaa'
 end