Error not detected by Cucumber test

Question

I am using the version of Gem Aruba 0.13.0 and Cucumber 2.x. x

would like to know how to detect the following error using a Ruba step Definition. More specifically if Exit status was successful and is possible by the type of error that is occurring in the execution of the application:

#!/usr/bin/env ruby

$:.unshift File.join(File.dirname(__FILE__), "..","lib")

require 'game'

game = Game.new
game.start

while not game.ended?
    game.next_step
end

The error occurs when executing the above class by the command line.

bin/forca:10:in <main>': undefined methodended?' for #<'Game:0x000000012fc7d0 @output=#<'IO:<'STDOUT>>> (NoMethodError) Basically what he’s telling me is that the ended method isn’t defined, and it really isn’t, but Cucumber doesn’t detect the error.

the functionality is as follows by Cucumber:

Funcionalidade: Começar jogo
    Para poder passar o tempo
    Como jogador
    Quero poder começar um novo jogo

    Cenário: Começo de novo jogo um sucesso
        Ao começar o jogo, é mostrada a mensagem inicial para o jogador.

        Quando começo um novo jogo
        E termino o jogo
        Então o jogo termina com a seguinte mensagem na tela:
         """
         Bem vindo ao jogo da forca!
         """

use the following step to predict the error:

Então /^o jogo termina com a seguinte mensagem na tela:$/ do |text|
    steps %{
        Then it should pass with:
        """
        #{text}
        """ 
}
end 

Thanks for the feedback and edited for better understanding.

Answer 1

The answer to the question is in the way Steps were defined, a wrong syntax was used for Steps defined in Gem Aruba itself

Então /^o jogo termina com a seguinte mensagem na tela:$/ do |text|
    steps %{
        Then it should pass with:
        """
        #{text}
        """ 
}
end

is wrong when it would be better or the right case:

Então /^o jogo termina com a seguinte mensagem na tela:$/ do |text|
        step %(the stdout should contain "#{text}")
}
end

much more concise and according to what Gem meets.

Well, thank you to those who answered my questions.