BYK/ES5 — comment on commit fe2904448fd4fe504e99107f3e2b3e64d7fa03a8
File: test/unit/Date.js line 15
By BYK:

The edge case here is the method's ".length" property in my opinion. The "actual" test can directly compare with the result of the "toIsoString" I guess.

We can use something like
var today = new Date();
equal(today.toJSON(), today.toISOString(), "explanation...");