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require_relative '../../spec_helper'
require_relative 'fixtures/classes'
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
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