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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.
This is a good point. Random or not, a proper test set should have at least one test for each combination of input traits. Suppose the set of input traits is {hasHttp, hasHttps, hasWww, hasSLD, hasSubdomain, hasFilenameAtEnd}, where each trait is true or false. For all combinations of true and false values for those traits, the test set should include a URL that satisfies those traits.