diff_as_string

# File lib/spec/expectations/differs/default.rb, line 20
        def diff_as_string(data_new, data_old)
          data_old = data_old.split(/\n/).map! { |e| e.chomp }
          data_new = data_new.split(/\n/).map! { |e| e.chomp }
          output = ""
          diffs = Diff::LCS.diff(data_old, data_new)
          return output if diffs.empty?
          oldhunk = hunk = nil  
          file_length_difference = 0
          diffs.each do |piece|
            begin
              hunk = Diff::LCS::Hunk.new(data_old, data_new, piece, context_lines,
                                         file_length_difference)
              file_length_difference = hunk.file_length_difference      
              next unless oldhunk      
              # Hunks may overlap, which is why we need to be careful when our
              # diff includes lines of context. Otherwise, we might print
              # redundant lines.
              if (context_lines > 0) and hunk.overlaps?(oldhunk)
                hunk.unshift(oldhunk)
              else
                output << oldhunk.diff(format)
              end
            ensure
              oldhunk = hunk
              output << "\n"
            end
          end  
          #Handle the last remaining hunk
          output << oldhunk.diff(format) << "\n"
        end