refactor: remove redundant assertion in test_remove_existing_key

Author: FarhanAnjum-opti

tests/test_lru_cache.py

@@ -163,7 +163,6 @@ def test_remove_from_zero_sized_cache(self):
         cache.remove("1")
 
         self.assertIsNone(cache.lookup("1"))
-        self.assertEqual(len(cache.map), 0)
 
     def test_remove_and_add_back(self):
         cache = LRUCache(3, 1000)