File: take_last_spec.rb

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require 'spec_helper'

unless Enumerable.method_defined? :take_last
  describe 'Enumerable#take_last' do
    it 'takes the last n elements' do
      expect([1, 2, 3, 4].take_last(2)).to eq([3, 4])
    end

    it 'returns everything if you request to drop too many elems' do
      expect((1..10).take_last(100)).to eq((1..10).to_a)
    end

    it 'does not accept negative argument' do
      expect { [1, 2, 3, 4].take_last(-1) }.to raise_error(ArgumentError)
    end
  end
end