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Editorial Team
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Asked: 2026-05-24T10:50:05+00:00

I’m writing a command-line application in Ruby. I’m rather familiar with Rspec 2, as

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I’m writing a command-line application in Ruby. I’m rather familiar with Rspec 2, as it’s used in some Rails applications I’m working on. I’m writing a command-line application and I’m attempting to use Rspec 2 for BDD.

How can I test the user interface layer of my application? I need to give the application interactive input, or check for certain output printed using puts. Also, is there any way to suppress the STDOUT output? When I run autotest, the output of my application gets printed between the status outputs of rspec, making it extremely hard to read.

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1 Answer

  1. Editorial Team

    Here’s an example that should help you. I use it in one of my apps that I test with Minitest, but it should be easy to translate to Rspec.

    def setup
  $stdout = StringIO.new
  ...
end

    This gets rid of the app’s output in between the test results, since stdout will be written to a StringIO object. The same way you can also test if something specific got output, since you can check the StringIO object against regular expressions.

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