Javascript split behavior if delimiter is not contained in string

Question

What is the correct behavior

"test".split("/") 

Should the result be ["test"] or undefined? I ask because I have different results for two different javascript engines. Most browsers seem to return ["test"], so I wonder if rejection behavior should be considered an error.

Answer 1

the ES5 specification for String.prototype.split does not allow any return result other than an array, so undefined is incorrect.