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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.
Your link is wrong and give a 404 error:
http://junit-team.github.io/junit/javadoc/4.10/org/hamcrest/CoreMatchers.html
You can install TestNG in Eclipse but I would be mindful of the fact, that its a pain to keep separate from Junit.