Unit Test: /core/utility/service/validation/numbers

My first time ever working with unit tests but it seems like an area I might be able to help with. Figured I'd start simple, let me know if I'm doing this right / wrong. Was trying to find a way to do this without using the ConcreteDatabaseTestCase since I didn't need a database for this but probably not a huge deal?

Changed the Numbers validation to return false instead of null when it isn't a number (updated phpdoc), created unit test for the class. and PSR2 all the things