code: def test_kernel_cache_in_action(self):
      if Device.DEFAULT not in ["CLANG"]:
          self.skipTest("No custom kernel cache is implemented")
  
      a = Tensor.rand(4, 4)
      b = Tensor.rand(4, 4)
      x = a + b
      x.realize()
  
      orig_compile_func = Device["CLANG"].compiler
      Device["CLANG"].compiler = None  # making it not callable
  
      a1 = Tensor.rand(4, 4)
      b1 = Tensor.rand(4, 4)
      x1 = a1 + b1
      x1.realize()  # Same kernel should be from cache.
  
      Device["CLANG"].compiler = orig_compile_func
  
imports: import unittest
  from tinygrad.tensor import Tensor
  from tinygrad import Device
label_desc: Use image node_id 1 for calling the TestKernelCache obj's underlying member method code with example usage: obj.test_kernel_cache_in_action() without return types