excel - Where does the .xlsx file creates when creating using axlsx gem in ruby -

where .xlsx file creates when creating using axlsx gem in ruby.

this example taken axslx homepage:

axlsx::package.new |p|   p.workbook.add_worksheet(:name => "pie chart") |sheet|     sheet.add_row ["simple pie chart"]     %w(first second third).each { |label| sheet.add_row [label, rand(24)+1] }     sheet.add_chart(axlsx::pie3dchart, :start_at => [0,5], :end_at => [10, 20], :title => "example 3: pie chart") |chart|       chart.add_series :data => sheet["b2:b4"], :labels => sheet["a2:a4"],  :colors => ['ff0000', '00ff00', '0000ff']     end   end   p.serialize('simple.xlsx') end 

do file created serialize() call. filename specifiy there relative working directory. can find dir.pwd