thank you for your great help!

// there is a problem in expectation
Expected: 'The quick brown fox jumps over the 2 lazy dogs', instead got: 'Gur dhvpx oebja sbk whzcf bire gur 7 ynml qbtfGur dhvpx oebja sbk whzcf bire gur 7 ynml qbtfThe quick brown fox jumps over the 2 lazy dogs'

( JS )

Random tests suddenly expect strings. This is specified nowhere, and it's not the correct solution either: JS has arbitrary precision integers.

( JS )

Example test 5:

expected undefined to equal 900000000000000000000 [ that should end in 9 ]

You are exceeding Number.MAX_SAFE_INTEGER.

I am so proud and so happy that I solved this kata after 4 days of thinking! This kata is challenging, but in such a good way that even a beginner (as I am) could solve it in the end. Thanks for this! :)

test 3 is faild

not an issue