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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.
Added a note to the description.
I faced the same problem and had to forfeit to see what was up.
Fixed.
Thank you for your bug report, @Trang Oul.
Indeed, the test cases were broken (maybe due to the system update done at some point)
Even sample test case was broken because 'pwd' command doesn't return 'runner\n' anymore)
To fix the issues,I have disabled the tests related to 'pip' commands so that the proper codes should pass.