You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: mock.rb
    path of file: ./repos/excon/lib/excon/middlewares
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

    
      def request_call(datum)
        if datum[:mock]
          # convert File/Tempfile body to string before matching:
          if datum[:body].respond_to?(:read)
           if datum[:body].respond_to?(:binmode)
             datum[:body].binmode
           end