def test_ne__different_lists_same_length__returns_true() -> None:
list1 = List([1, 2, 3])
list2 = List([3, 2, 1])
result = list1 != list2
assert result
def test_eq__equal_lists__returns_true() -> None:
list1 = List([1, 2, 3])
list2 = List([1, 2, 3])
result = list1 == list2
assert result
def test_ne__equal_lists_returns__false() -> None:
list1 = List([1, 2, 3])
list2 = List([1, 2, 3])
result = list1 != list2
assert not result
def test_eq__different_lists_same_length__returns_false() -> None:
list1 = List([1, 2, 3])
list2 = List([3, 2, 1])
result = list1 == list2
assert not result
def test_remove__not_existing_element__returns_same_list() -> None:
old_list = List([11, 22, 33])
with raises(ValueError) as e:
old_list.remove(99)
assert str(e.value) == '99 not in list'
def test_remove__element__not_contain_element() -> None:
old_list = List([11, 22, 33])
new_list = old_list.remove(22)
assert 22 not in new_list
assert len(new_list) == len(old_list) - 1
def test_add__element__contains_new_element() -> None:
old_list = List([11, 22, 33])
new_list = old_list.add(44)
assert 44 in new_list
assert list(new_list).index(44) == 3
assert len(new_list) == len(old_list) + 1
def test_lazy_reduce() -> None:
lazy_number_1 = Mock(return_value=11)
lazy_number_2 = Mock(return_value=22)
lazy_number_3 = Mock(return_value=33)
numbers = List([
lazy_number_1,
lazy_number_2,
lazy_number_3,
])
def lazy_add(number1: int, number2: Callable[[], int]) -> int:
return number1 + number2()
result = lazy_reduce(lazy_add, numbers)
assert result == 66
lazy_number_1.assert_called_once()
lazy_number_2.assert_called_once()
lazy_number_3.assert_called_once()