Testing for input [11,20,20,20,17,19,19,16,20,17]
should work for random tests with small arrays - Expected: '[]', instead got: '[[11], [20, 20, 20, 20], [17, 17], [19, 19], [16]]'

I'm having an issue with the reported failure...why is the expected result an empty array for a non-empty input?