I'm having problems with random test aswell: "expected:<[Red]> but was:<[Yellow]>". But, when I run same code in my pc, it returns me "Red" wtf!, so my code is ok but in codewars page is wrong?

Thanks.I don't handle Boundary Value Problems correctly

Don't mutate the input. ;)

Java random tests is messed up.I checked the output of each step and the final result is correct,but I can't pass the random test :(