instance method output_filename

# File activesupport/lib/active_support/testing/performance.rb, line 207
            def output_filename(printer_class)
              suffix =
                case printer_class.name.demodulize
                  when 'FlatPrinter';                 'flat.txt'
                  when 'FlatPrinterWithLineNumbers';  'flat_line_numbers.txt'
                  when 'GraphPrinter';                'graph.txt'
                  when 'GraphHtmlPrinter';            'graph.html'
                  when 'GraphYamlPrinter';            'graph.yml'
                  when 'CallTreePrinter';             'tree.txt'
                  when 'CallStackPrinter';            'stack.html'
                  when 'DotPrinter';                  'graph.dot'
                  else printer_class.name.sub(/Printer$/, '').underscore
                end

              "#{super()}_#{suffix}"
            end