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_client.rb
    path of file: ./repos/peddler/test/unit/peddler
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

require 'helper'
require 'null_client'

class TestPeddlerClient < MiniTest::Test
  def setup
    Excon.defaults[:mock]
    
    def setup
      body = <<-XML
        <ErrorResponse>
          <Error>
            <Code>500</Code>
          </Error>
        </ErrorResponse>
      XML
      Excon.stub({}, body: body, status: 500)
      super
    end