For many community puzzles the number and variety of the provided IDE test cases are barely sufficient.
I experienced several times that I pass all ide tests and fail at some validators (no hard-coding!) or even I passed validators 100% while I knew that my code still has a flaw.
I can imagine that creating additional test cases might be not the most interesting part of puzzle creation, but I encourage creators to still do so.
As a positive example: this puzzle has almost 20 test cases… https://www.codingame.com/training/medium/cards-castle
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Well, I just posted my very first puzzle candidate, and now I can tell from experience that ‘test case creation’ is indeed the most painful part of the whole process… 
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