# File spec/gherkin/formatter/filter_formatter_spec.rb, line 17
      def verify_filter(filters, *line_ranges)
        io = StringIO.new
        pretty_formatter = Gherkin::Formatter::PrettyFormatter.new(io, true, false)
        filter_formatter = Gherkin::Formatter::FilterFormatter.new(pretty_formatter, filters)
        parser = Gherkin::Parser::Parser.new(filter_formatter)

        path = File.dirname(__FILE__) + "/../fixtures/" + file
        source = File.new(path).read + "# __EOF__"
        parser.parse(source, path, 0)
        
        source_lines = source.split("\n")
        expected = (line_ranges.map do |line_range|
          source_lines[(line_range.first-1..line_range.last-1)]
        end.flatten).join("\n").gsub(/# __EOF__/, '')
        io.string.should == expected
      end