Each of them going to be false and true sometimes. When the condition return true or false, even it return true fullfilling the condition.

Each method should be not longer than five lines of code

This requirement is nonsensical, and it is not tested.

Each method should be not longer than five lines of code

This requirement is nonsensical, and it is not tested.

Duplicate issue.

• too few tests
• randomness is not really checked: see this solution
• using Test.expect

Removed, if someone wants to implement that, excellent, but the author is long gone ... .

Re-raised issue with details about the problem.

Lots of languages/kata's are like that, you have to logger them.

The protected keyword and the 5 lines requirement are completely irrelevant to the task at hand.

Even worse, the 5 lines requirement is not tested at all.

That'd be too easy though ;-)

Not too much of a issue I think ;-)

Not an issue

I agree, I just changed the numbers and let randomness solve it.

Missing space: "shouldbe" should be "should be". Try saying that five times fast :)