require_relative '../../spec_helper' describe "TrueClass#singleton_method" do ruby_version_is '3.3' do it "raises regardless of whether TrueClass defines the method" do -> { true.singleton_method(:foo) }.should raise_error(NameError) begin def (true).foo; end -> { true.singleton_method(:foo) }.should raise_error(NameError) ensure TrueClass.send(:remove_method, :foo) end end end end