module ProcessHelpers
  def successful_process_status
    process_status_double(true)
  end

  def failed_process_status
    process_status_double(false)
  end

  def process_status_double(success_boolean)
    instance_double(Process::Status).tap do |status|
      allow(status).to receive(:success?).and_return success_boolean
    end
  end

  def which_success(command)
    # The kind of response that Open3 will return if `which command` was successful
    ["/usr/local/bin/#{command}\n", successful_process_status]
  end

  def which_failure
    # The kind of response that Open3 will return if `which command` failed
    ["", failed_process_status]
  end
end