They are always done like that, at least by me:-) It avoids to have a bunch of test functions; it is already rather long and the reports are the same, separated or not. You will do as you want when you author your own katas.
Note: I think it can be a suggestion, not an issue! Authors can put the tests as they want. I encourage you to see some katas with very few tests. Nevertheless I thank you for the feedback (you are one of the few who succeeded).