def test_one_left_child(self):
"""
Test sum_leaves on a BinaryTree with one left child.
"""
t = BinaryTree(1, BinaryTree(5))
self.assertNotEqual(
sum_leaves(t), 1, "sum_leaves should not " +
"count None or any BinaryTrees with children as" + " leaf nodes.")
self.assertNotEqual(
sum_leaves(t), 6, "sum_leaves should not " +
"count None or any BinaryTrees with children as" + " leaf nodes.")
self.assertEqual(
sum_leaves(t), 5, "sum_leaves should return the " +
"value of the leaf child when used on a BinaryTree " +
"with a single leaf child.")
def test_one_right_child(self):
"""
Test sum_leaves on a BTNode with one right child
"""
t = BTNode(1, None, BTNode(5))
self.assertNotEqual(
sum_leaves(t), 1, "sum_leaves should not " +
"count None or any BTNodes with children as" + " leaf nodes.")
self.assertNotEqual(
sum_leaves(t), 6, "sum_leaves should not " +
"count None or any BTNodes with children as" + " leaf nodes.")
self.assertEqual(
sum_leaves(t), 5, "sum_leaves should return the " +
"data of the leaf child when used on a BTNode " +
"with a single leaf child.")
def test_leaf(self):
"""
Test sum_leaves on a leaf.
"""
self.assertEqual(
sum_leaves(BinaryTree(2)), 2, "sum_leaves should" +
" return the leaf's value when used on a leaf.")
def test_leaf(self):
"""
Test sum_leaves on a leaf.
"""
self.assertEqual(
sum_leaves(BTNode(2)), 2, "sum_leaves should" +
" return the leaf's data when used on a leaf.")
def test_two_leaf_children(self):
"""
Test sum_leaves on a BinaryTree with two leaf children.
"""
t = BinaryTree(5, BinaryTree(4), BinaryTree(3))
self.assertEqual(
sum_leaves(t), 7, "sum_leaves should sum all " +
"of the leaves in the entire BinaryTree.")
def test_returns_int(self):
"""
Test sum_leaves to make sure it returns an int.
"""
return_type = type(sum_leaves(BinaryTree(1)))
self.assertEqual(
return_type, int, "sum_leaves should return type " +
"int, but instead returned type {}.".format(return_type))
def test_sum_leaves(self, tuple_tree):
"""
Test sum_leaves on a randomly generated BinaryTree.
"""
(t, expected) = tuples_to_tree(tuple_tree)
actual = sum_leaves(t)
self.assertEqual(actual, expected,
("test_sum_leaves on BinaryTree\n{}\nReturned {}" +
" instead of {}.").format(tuple_tree, actual,
expected))
def test_none(self):
"""
Test sum_leaves on None.
"""
self.assertEqual(sum_leaves(None), 0,
"sum_leaves on None should " + "return 0.")