code: def test_decorator(self):
      calls = 0
  
      @diskcache
      def hello(x):
          nonlocal calls
          calls += 1
          return "world" + x
  
      self.assertEqual(hello("bob"), "worldbob")
      self.assertEqual(hello("billy"), "worldbilly")
      kcalls = calls
      self.assertEqual(hello("bob"), "worldbob")
      self.assertEqual(hello("billy"), "worldbilly")
      self.assertEqual(kcalls, calls)
  
file_path: tinygrad/test/unit/test_disk_cache.py
imports: import unittest
  import pickle
  from tinygrad.helpers import diskcache_get, diskcache_put, diskcache
label_desc: Use image node_id 8 for calling the DiskCache obj's underlying member method code with example usage: obj.test_decorator() and returns: unknown