Made test for search more precise

Programming_Paradigms/bintree_test.py

@@ -12,7 +12,8 @@ class TestBinTree(unittest.TestCase):
     def test_has_insert_and_search(self):
         tree = BinTree()
         tree.insert(1)
-        tree.search(1)
+        self.assertTrue(tree.search(1))
+        self.assertFalse(tree.search(0))
 
     def test_insert_into_empty_tree(self):
         tree = BinTree()