# File lib/rspec-puppet/support.rb, line 125
    def param_str
      params.keys.map do |r|
        param_val = params[r]
        param_val_str = if param_val == :undef
                          'undef'  # verbatim undef keyword
                        else
                          escape_special_chars(param_val.inspect)
                        end
        "#{r.to_s} => #{param_val_str}"
      end.join(', ')
    end