Check for BinTree.root == None

Programming_Paradigms/bintree_test.py

@@ -4,6 +4,11 @@
 import unittest
 from bintree import BinTree, BinTreeNode
 
+class TestBinTree(unittest.TestCase):
+    def test_create_has_root_none(self):
+        tree = BinTree()
+        self.assertIsNone(tree.root)
+
 class TestBinTreeNode(unittest.TestCase):
     def test_creation(self):
         node = BinTreeNode(5)