Correction of the error in unit tests

 - Change comparison values
Merge pull request #1096 from GhiGt/error-units-tests

Fix: error in unit tests

That is somewhere, when the object TimeWithZone is created, all content is put except usec.
I didn't find where is the mistake. I look for on the web and some people who have the same problem say that we can just test equity with object.to_a.