THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
...
18) (optional) replace use of org.junit.Assert with use of AssertJ
AssertJ provides much better failure messages that will make dealing with test failures much easier in the future. It also provides richer handling of expected exceptions than JUnit.
19) reorganize test so that vars and Rules are at the top, Before and After methods come before tests, Test methods come next, then any private methods used by the tests and finally any inner classes at the bottom of the class
...