def test_comprehensions_can_be_used_for_filtering_etc():
start = Til(1, 2, 3, 4)
assert til(x for x in start if x != 3) == Til(1, 2, 4)
def test_the_til_function_also_takes_elements():
assert til(1, 2, 3) == Til(1, 2, 3)
def test_comprehension_style_construction():
assert til(x for x in range(0, 3)) == Til(0, 1, 2)
def test_tils_have_a_length():
assert len(Til(2, 7, 8)) == 3
def test_tils_are_reversible():
assert reversed(Til(2, 7, 8)) == Til(8, 7, 2)
def test_tils_are_iterable():
assert [x for x in Til(1, 2, 4)] == [1, 2, 4]
def test_tils_are_containers():
assert 2 in Til(1, 2, 4)
def test_empty_lists_must_have_a_type():
with pytest.raises(SyntaxError):
Til()
def test_new_elements_are_type_checked():
start = Til(3)
with pytest.raises(TypeError):
start.append("steve")
def test_child_types_may_be_fine_but_parent_types_arent():
with pytest.raises(TypeError):
Til(ParentType(), element_type=ChildType)
def test_the_type_of_the_list_can_be_set_explicitly():
with pytest.raises(TypeError):
Til("three", element_type=int)
def test_child_types_are_fine():
child_element = ChildType()
assert child_element in Til(ParentType(), child_element, ParentType())
def test_the_lists_are_homogenous():
with pytest.raises(TypeError):
Til(1, 2, "three")
def test_adding_elements_is_immutable():
start = Til(3)
end = start.append(5).append(7)
assert start == Til(3)
assert end == Til(3, 5, 7)
def test_conversion_to_list():
assert Til(2, 7, 8).as_list() == [2, 7, 8]
def test_construction_from_numbers():
assert Til(2, 7, 8) == Til(2, 7, 8)