public function dataProviderForFibonacci() { return [[-1, []], [0, []], [1, [0]], [2, [0, 1]], [3, [0, 1, 1]], [4, [0, 1, 1, 2]], [5, [0, 1, 1, 2, 3]], [6, [0, 1, 1, 2, 3, 5]], [13, [0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144]]]; }