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Capturing Standard Out In Unit Tests

May 11, 2009 Alex Chaffee 

    def capturing_output
      output = StringIO.new
      $stdout = output
      yield
      output.string
    ensure
      $stdout = STDOUT
    end

then…

    it "exits immediately from --version" do
      output = capturing_output do
        lambda {
          Erector.new(["--version"])
        }.should raise_error(SystemExit)
      end
      output.should == Erector::VERSION + "n"
    end

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