require_relative '../../spec_helper' require_relative 'fixtures/classes' ruby_version_is '2.4' do describe 'Enumerable#sum' do before :each do @enum = Object.new.to_enum class << @enum def each yield 0 yield(-1) yield 2 yield 2/3r end end end it 'returns amount of the elements with taking an argument as the initial value' do @enum.sum(10).should == 35/3r end it 'gives 0 as a default argument' do @enum.sum.should == 5/3r end it 'takes a block to transform the elements' do @enum.sum { |element| element * 2 }.should == 10/3r end end end