# File lib/protest/utils/backtrace_filter.rb, line 16
      def filter_backtrace(backtrace, prefix=nil)
        paths = ESCAPE_PATHS + [prefix].compact
        backtrace.reject do |line|
          file = line.split(":").first
          paths.any? {|path| File.expand_path(file) =~ path }
        end
      end