method.rb

def == (list)
  (0..size).each do |position|
    if set[position] != list.set[position]
      return false
    end
  end
  true
end

spec.rb

  context "with a populated list" do                                                                                                                          
    before(:each) do                                                                                                                                          
      @list = List.new                                                                                                                                        
      @list.add 1                                                                                                                                             
      @list.add 4                                                                                                                                             
      @list.add 5                                                                                                                                             
      @list.add 3                                                                                                                                             
    end                    
    describe "when campairing to another list" do                                                                                                             
      it "retuns true when the lists are equal" do                                                                                                            
        list2 = List.new                                                                                                                                      
        list2.add 1                                                                                                                                           
        list2.add 4                                                                                                                                           
        list2.add 5                                                                                                                                           
        list2.add 3                                                                                                                                           
        @list.equals(list2).should be_true                                                                                                                    
        (@list == list2).should be_true                                                                                                                       
        (@list != list2).should be_false                                                                                                                      
      end                                                                                                                                                     
      it "returns false when the lists aren't equal" do                                                                                                       
        list2 = List.new                                                                                                                                      
        list2.add 2                                                                                                                                           
        list2.add 4                                                                                                                                           
        list2.add 6                                                                                                                                           
        list2.add 3                                                                                                                                           
        @list.equals(list2).should be_false                                                                                                                   
        (@list == list2).should be_false                                                                                                                      
        (@list != list2).should be_true                                                                                                                       
      end                                                                                                                                                     
    end
  end