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-rw-r--r--test/ruby/test_class.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/test/ruby/test_class.rb b/test/ruby/test_class.rb
index b444d4e8abb..3a0ced8be76 100644
--- a/test/ruby/test_class.rb
+++ b/test/ruby/test_class.rb
@@ -181,6 +181,8 @@ class TestClass < Test::Unit::TestCase
o = Object.new
c = class << o; self; end
assert_raise(TypeError) { c.dup }
+
+ assert_raise(TypeError) { BasicObject.dup }
end
def test_singleton_class