new

# File railties/lib/rails/test_unit/runner.rb, line 184
      def initialize(runnable, file, line_or_range)
        @runnable, @file = runnable, File.expand_path(file)
        if line_or_range
          first, last = line_or_range.split("-").map(&:to_i)
          last ||= first
          @line_range = Range.new(first, last)
        end
      end