def test_size(self):
tree = Bst()
self.assertEquals(tree.size, 0)
self.assertEquals(tree.size, tree.getsize())
# Set tree size to arbitrary number
ARBITRARY_SIZE = 5
tree.size = ARBITRARY_SIZE
self.assertEquals(tree.size, ARBITRARY_SIZE)
self.assertEquals(tree.size, tree.getsize())
# Adding should increment size
tree = balanced_tree()
self.assertEquals(tree.getsize(), 7)
FAR_RIGHT_DATA = 100
tree.add(FAR_RIGHT_DATA)
self.assertEquals(tree.getsize(), 8)
# Removing should decrement size
tree = balanced_tree()
self.assertEquals(tree.getsize(), 7)
tree.remove(ROOT_DATA)
self.assertEquals(tree.getsize(), 6)
def remove_one_child_root():
"""Removing root in a tree where the root has only one child"""
tree = Bst()
tree.add(ROOT_DATA)
tree.add(LEFT_DATA)
self.assertFalse(tree.isempty())
self.assertEquals(tree.getsize(), 2)
self.assertEquals(tree.root.getleft().getdata(), LEFT_DATA)
val = tree.remove(ROOT_DATA)
self.assertFalse(tree.isempty())
self.assertEquals(tree.getsize(), 1)
self.assertEquals(val, ROOT_DATA)
self.assertIsNotNone(tree.root)
self.assertNotEquals(tree.root.getdata(), ROOT_DATA)
self.assertEquals(tree.root, Node(LEFT_DATA))