You're welcome, I enjoyed your kata :)
I hope everything else will be ok with the translation :)

I've added random encode tests and fixed the naming.
Also I would like to tell you about little change I've made in random tests with errors. In the python reference, there is always changed every third bit of the string. I think that it doesn't simulate real situation well enough so I randomly change 1 of the bits in every chunk of 3 bits.
It's still safe that only one bit is changed and correct value can be recovered.

Good point. Apparently I must have deleted something accidentally... or some copy paste fail.
Actually there are random encode tests but it's incorrectly named random_test_without_errors
while random tests for decode without errors is missing. I'll add them and fix naming as soon as I am free.

Thanks :)