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: test_interface.rb
    path of file: ./repos/stackneveroverflow/vendor/bundle/ruby/2.3.0/gems/byebug-9.0.6/lib/byebug/interfaces
    
    the code of the file until where you have to start completion: module Byebug
  #
  # Custom interface for easier assert
    
    def read_command(prompt)
      cmd = super(prompt)

      return cmd unless cmd.nil? && test_block

      test_block.call
      self.test_block = nil
    end