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: classes.rb
    path of file: ./repos/spec/library/bigdecimal/fixtures
    
    the code of the file until where you have to start completion: module BigDecimalSpecs
  # helper method to sure that the global limit is rese
    
  def self.with_rounding(r)
    old = BigDecimal.mode(BigDecimal::ROUND_MODE)
    BigDecimal.mode(BigDecimal::ROUND_MODE, r)
    yield
  ensure
    BigDecimal.mode(BigDecimal::ROUND_MODE, old)
  end