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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
src/test/java/UserTest.java:6: error: unreported exception Exception; must be caught or declared to be thrown
user.incProgress(rank);
In updated description for java tell us to use IlegalArgumentExceptions, that is a RuntimeException, but unit test are expecting Exception:
Expected exception: java.lang.Exception
This is beuty code, but not clever. It iterates 4 times each String instead of 1.