def test_tree_traverse_success_with_nested_tree(self):
result = tree_traverse(self.nested_tree, 'i')
assert_that(result, equal_to(888))
def test_tree_traverse_success_with_deeply_nested_tree(self):
result = tree_traverse(self.deeply_nested_tree, 'p')
assert_that(result, equal_to(678))
def test_tree_traverse_success_with_flat_tree(self):
result = tree_traverse(self.flat_tree, 'c')
assert_that(result, equal_to(3))