Test node for left and right children

Programming_Paradigms/bintree_test.py

@@ -4,5 +4,11 @@
 import unittest
 from bintree import BinTree, BinTreeNode
 
+class TestBinTreeNode(unittest.TestCase):
+    def test_has_left_and_right(self):
+        node = BinTreeNode()
+        self.assertIn("left", node.__dict__)
+        self.assertIn("right", node.__dict__)
+
 if __name__ == "__main__":
     unittest.main()