add more tests
add more tests

collinmesser/esfiddle,esfiddle/esfiddle,vcapretz/esfiddle,vcapretz/esfiddle,esfiddle/esfiddle,joshghent/es6-fiddle-web,asiyani/esfiddle,asiyani/esfiddle,joshghent/es6-fiddle-web,esfiddle/esfiddle,collinmesser/esfiddle