Expect classes BinTree and BinTreeNode

Programming_Paradigms/bintree_test.py

@@ -2,7 +2,7 @@
 # *-* coding:utf-8 *-*
 
 import unittest
-from bintree import *
+from bintree import BinTree, BinTreeNode
 
 if __name__ == "__main__":
     unittest.main()