what is best html editors that allow me to test code

Answer 1

use Google chrome and its console...ctrl+shift+i on your .html file opened on the browser and than you'll have the possibility to live edit your file and modify html and css of your page (that is only a testing tool...you won't edit and save your .html file but only the browser page)
otherwise you can use an ide like brackets or komodo to edit your file and have a preview