CoCalc provides the best real-time collaborative environment for Jupyter Notebooks, LaTeX documents, and SageMath, scalable from individual users to large groups and classes!

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require 'stringio'
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RSpec.shared_context 'Msf::StringIO' do
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  #
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  # lets
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  #
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  let(:msf_io) do
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    s = StringIO.new('', 'w+b')
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    class << s
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      attr_accessor :msf_data
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    end
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    s.msf_data = ''
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    s.binmode
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    s
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  end
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  #
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  # Callbacks
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  #
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  before(:example) do
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    def msf_io.get_once
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      read
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    end
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    def msf_io.has_read_data?(_timeout)
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      !eof?
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    end
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    def msf_io.put(_data)
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      seek(0)
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      if msf_data.nil? || msf_data.empty?
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        length = write(_data)
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      else
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        length = write(msf_data)
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      end
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      seek(0)
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      length
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    end
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  end
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end
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