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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.
bump for this as still seeing it. A limit of three consecutive characters implies a number no greater than 4999 so the tests should reflect this.
some of your tests are wrong, if they work for you, it would suggest your function is wrong
e.g.
[TestCase("[[]]", false)]
[TestCase("{{}}", false)]
[TestCase("(())", false)]
these should all return true