1 files changed, 5 insertions, 0 deletions
diff --git a/test/t/class.rb b/test/t/class.rb
index 92f3df51d..cb056feff 100644
--- a/test/t/class.rb
+++ b/test/t/class.rb
@@ -5,6 +5,11 @@ assert('Class', '15.2.3') do
   Class.class == Class
 end
 
+assert('Class#superclass', '15.2.3.3.4') do
+  class SubClass < String; end
+  SubClass.superclass == String
+end
+
 # Not ISO specified
 
 assert('Class 1') do