1 files changed, 7 insertions, 0 deletions
diff --git a/test/ruby/test_class.rb b/test/ruby/test_class.rb
index 9c016dd693..1d9ee55d7a 100644
--- a/test/ruby/test_class.rb
+++ b/test/ruby/test_class.rb
@@ -547,5 +547,12 @@ class TestClass < Test::Unit::TestCase
     assert_raise_with_message(TypeError, "#{n} is not a class") {
       m.module_eval "class #{n}; end"
     }
+
+    assert_separately([], <<-"end;")
+      Date = (class C\u{1f5ff}; self; end).new
+      assert_raise_with_message(TypeError, /C\u{1f5ff}/) {
+        require 'date'
+      }
+    end;
   end
 end