a u .- Exercise 4. Write JUnit tests for this class. We are trying to get you into the habit of recognizing how much testing is sufficient, so in the future we will not be so specific on how much testing we expect from you, but for this exercise we will give you the cues that you should thoroughly test these different categories. You need to decide what method calls go where and what assertions to use. 0 Basics: instantiating objects of Student, getters, adding quizzes 0 Testing statistics: total score. average score. don't forget edge cases