def test_threeelements_chain(self):
"""Tests three-element tree where root has one child."""
root = Node(key=42)
left = Node(key=50)
right = Node(key=100)
root.left = left
left.right = right
self.assertTrue(findk(root, 42))
self.assertTrue(findk(root, 50))
self.assertTrue(findk(root, 100))
def test_threeelements_split(self):
"""Tests three-element tree where root has two children."""
root = Node(key=42)
left = Node(key=50)
right = Node(key=100)
root.left = left
root.right = right
self.assertTrue(findk(root, 42))
self.assertTrue(findk(root, 50))
self.assertTrue(findk(root, 100))
def test_testbookexample(self):
"""Tests the min-first tree from text."""
i = Node(key=23)
h = Node(key=19, left=i)
g = Node(key=17)
c = Node(key=13, left=g, right=h)
e = Node(key=7)
f = Node(key=11)
d = Node(key=5, left=e, right=f)
b = Node(key=3, right=d)
a = Node(key=2, left=b, right=c)
self.assertTrue(findk(a, 2))
self.assertTrue(findk(a, 13))
self.assertTrue(findk(a, 11))
self.assertTrue(findk(a, 19))
self.assertTrue(findk(a, 23))
self.assertFalse(findk(a, 1))
self.assertFalse(findk(a, -1))
self.assertFalse(findk(a, 100))
def test_singleelement(self):
"""Tests a single-element tree."""
root = Node(key=42)
self.assertTrue(findk(root, 42))
self.assertFalse(findk(root, 41))