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