I totally agree with you. Very interesting without being too much complex. I am not satisfied by my solution, so I will retry it some day :)

Hello, I had a similar probleme, because I hadn't understood the description... and the failing message isn't explicit enough, I think.

You could write a message to explain what was the expected result for each test. It would have helped me to understand my mistakes.

I've tried a better explanation... sorry, english isn't my mother tongue. I hope it is a bit better. I also think the failing error can be used to understand the process.

I was afraid of making something too complex. The threshold is just here to avoid a simple "all combinations" test.
It is easy to lower the limit to 5... But fewer will be more math challenge than game :)

It seems that the default function name is not the one used by test cases.
The default was changeUrlParameters instead of addOrChangeUrlParameter... or maybe I did something wrong ?

I was a bit (haha) confused before understanding that "first" bits are the right ones...
Maybe you should express the endianness in the description.

I made some changes that I hope answer to your comments.

For the other kata, it's maybe a good idea, I will try to implement it.

Thank you for your interest.

Thanks for the ideas. It's my first created Kata :)
I've added according to your suggestions.

And corrected the typo... sorry !