File: delete_at_spec.rb

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ruby-immutable-ruby 0.1.0-2
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require 'spec_helper'

describe Immutable::List do
  describe '#delete_at' do
    let(:list) { L[1,2,3,4,5] }

    it 'removes the element at the specified index' do
      list.delete_at(0).should eql(L[2,3,4,5])
      list.delete_at(2).should eql(L[1,2,4,5])
      list.delete_at(-1).should eql(L[1,2,3,4])
    end

    it 'makes no modification if the index is out of range' do
      list.delete_at(5).should eql(list)
      list.delete_at(-6).should eql(list)
    end
  end
end