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: testsuite.rb
    path of file: ./repos/genometools/testsuite
    
    the code of the file until where you have to start completion: #!/usr/bin/env ruby
#
# Copyright (c) 2006-2008 Gordo
    
def with_environment(variables={})
  if block_given?
    old_values = variables.map{ |k,v| [k,ENV[k]] }
    begin
       variables.each{ |k,v| ENV[k] = v }
       result = yield
    ensure
      old_values.each{ |k,v| ENV[k] = v }
    end