File: butfirst_spec.rb

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require 'spec_helper'

unless Array.method_defined? :butfirst
  describe 'Array#butfirst' do
    it 'returns an array without the first element' do
      expect([1, 2, 3].butfirst).to eq([2, 3])
    end

    it 'returns nil for empty lists' do
      expect([].butfirst).to be_nil
    end
  end
end