public function dataProviderForAsRowMatrix() { return [[[], [[]]], [[1], [[1]]], [[1, 2], [[1, 2]]], [[1, 2, 3], [[1, 2, 3]]], [[1, 2, 3, 4, 5, 6, 7, 8, 9, 10], [[1, 2, 3, 4, 5, 6, 7, 8, 9, 10]]]]; }