def test_cumulative_product_empty():
assert cumulative_product([]) == []
def test_cumulative_product_starts_with_zero(values):
array = [0] + list(values)
assert cumulative_product(array) == [0] * len(array)
def test_cumulative_product_simple():
assert cumulative_product([1, 2, 3]) == [1, 2, 6]
assert cumulative_product([3, 2, 1]) == [3, 6, 6]
assert cumulative_product([1, 2, 3, 4]) == [1, 2, 6, 24]
assert cumulative_product([1, 2, 3, 3]) == [1, 2, 6, 18]