def test_division_given_addition_to_string():
"""."""
tree = Div(Add(Leaf(12), Leaf(6)), Leaf(6))
assert tree.apply() == 3
assert tree.__str__() == "(12 + 6) / 6"
def test_addition_with_leaves_to_class_string():
"""."""
assert eval(Add(Leaf(5), Leaf(6)).class_str()).apply() == 11
def test_addition_with_leaves_to_string():
"""."""
tree = Add(Leaf(5), Leaf(6))
assert tree.apply() == 11
assert tree.__str__() == "5 + 6"
def test_addition_adds_when_given_leaves_with_numbers():
"""."""
assert Add(Leaf(5), Leaf(6)).apply() == 11
def test_addition_adds_when_given_leaves_with_numbers_deeper():
"""."""
assert Add(Add(Add(Add(Leaf(6), Leaf(6)), Leaf(6)), Leaf(6)),
Leaf(6)).apply() == 30
def test_addition_doesnt_equal_addition_when_different_value():
"""."""
assert Add(Leaf(2), Leaf(1)) != Add(Leaf(1), Leaf(2))
def test_set_add_adds_when_given_leaves_with_sets():
"""."""
assert Add(Leaf({5}), Leaf({6})).apply() == {5, 6}
def test_division_given_addition_to_string():
"""."""
tree = Add(Sub(Leaf(5), Leaf(6)), Sub(Leaf(5), Leaf(6)))
"""assert tree.apply() == 3"""
assert tree.__str__() == "(5 - 6) + (5 - 6)"
def test_addition_equals_addition_when_same_value():
"""."""
assert Add(Leaf(1), Leaf(2)) == Add(Leaf(1), Leaf(2))
def test_division_given_addition_to_string():
"""."""
tree = Add(Leaf(3), Div(Add(Leaf(12), Leaf(6)), Leaf(6)))
"""assert tree.apply() == 3"""
assert tree.__str__() == '3 + (12 + 6) / 6'
def test_multiplication_given_addition_given_addition_to_string():
""". Tree node class str."""
tree = Add(Leaf(3), Div(Add(Leaf(12), Leaf(6)), Leaf(6)))
assert tree.__str__() == "3 + (12 + 6) / 6"
def test_addition_given_addition_to_class_string():
""". Tree node class str."""
assert eval(Add(Add(Leaf(5), Leaf(6)),
Add(Leaf(5), Leaf(6))).class_str()).apply() == 22
def test_leaf_to_class_string1():
"""."""
assert Add(Leaf(5), Leaf(6)).class_str() == "Add(Leaf(5), Leaf(6))"
def test_no_apply():
"""."""
assert Add(Add(Leaf(5), Leaf(6)), Add(Leaf(5), Leaf(6))).class_str() \
== "Add(Add(Leaf(5), Leaf(6)), Add(Leaf(5), Leaf(6)))"