def test_search_falsey():
"""Can successfully determin that no values exist in an empty binary search tree"""
bst = BinarySearchTree()
expected = False
actual = bst._contains(10)
assert actual == expected
def test_search_falsey():
"""Can successfully determine that a value does not exist in a binary search tree"""
bst = BinarySearchTree()
bst.add(10)
bst.add(5)
bst.add(20)
bst.add(8)
bst.add(15)
expected = False
actual = bst._contains(25)
assert actual == expected
def test_search_another_node_truthy():
"""Can successfully find a value that exists in a binary search tree"""
bst = BinarySearchTree()
bst.add(10)
bst.add(5)
bst.add(20)
bst.add(8)
bst.add(15)
expected = True
actual = bst._contains(5)
assert actual == expected
