Largest Prime Factor

This is problem 3 of the Project Euler challenge series. The problem states:

The prime factors of 13195 are 5, 7, 13 and 29.

What is the largest prime factor of the number 600,851,475,143?

Note: I started this project to work on my unit testing skills in Java, so to see how the code works please see PrimeFactorizationTest.java file