thanks for help!

Hi, I am using ruby

Hello, why some tests expect Nill? See attached log:

Thanks for advice,
Radek

Random Tests
Testing: sequence_gen(-3, 3, -4, 15, 13, -1, -3, 10, -1, -5, 4, -7, 14)
Expected: nil, instead got: -3
Expected: nil, instead got: 3
Expected: nil, instead got: -4
Expected: nil, instead got: 15
Expected: nil, instead got: 13
Expected: nil, instead got: -1
Expected: nil, instead got: -3
Expected: nil, instead got: 10
Expected: nil, instead got: -1
Expected: nil, instead got: -5
Expected: nil, instead got: 4
Expected: nil, instead got: -7
Expected: nil, instead got: 14
Expected: nil, instead got: 35
Expected: nil, instead got: 73
Expected: nil, instead got: 143