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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.
Read the comments next time you find an issue.
In the Java testcases, the expected and the actual are swapped around, so your solution is returning 0 and the expected answer is 2.
Proven by the testcase
Well, there are several asserts in each test case. There are people advocating one assert per test case, but I am not one of them.
One test, for example, is:
I don't see this as an issue, so I will remove the flag for now.
If I misunderstood you, please let me know.