gistfile1.rb

require 'rspec'

class MyEnums
  
  def my_map(arr)
    result = []
    arr.each{|a| result << a*2}
    result
  end
end

describe MyEnums, "#my_map" do
  before(:each) do
    @arr = [1,2,3,4]
  end
  it "doubles each value in the array, just like map" do
    myenum = MyEnums.new
    myenum.my_map(@arr).should == @arr.map{ |a| a*2 }
  end
end