Skip test that requires lru if device's allocator isn't lru (#10003)

test/test_image_dtype.py

@@ -1,7 +1,7 @@
 import unittest
 import numpy as np
 from tinygrad import Device, dtypes, Tensor, Context
-from tinygrad.device import is_dtype_supported
+from tinygrad.device import LRUAllocator, is_dtype_supported
 from tinygrad.dtype import ImageDType
 from tinygrad.engine.realize import lower_schedule
 from tinygrad.helpers import prod, unwrap
@@ -91,6 +91,7 @@ class TestImageDType(unittest.TestCase):
     imgv = it.numpy()
     np.testing.assert_equal(np.maximum(imgv[:, 0], 0), it[:, 0].relu().numpy())
 
+  @unittest.skipUnless(isinstance(Device.default.allocator, LRUAllocator), "Requires LRU")
   def test_lru_alloc(self):
     data = Tensor.randn(9*27*4).realize()
     it = data.cast(dtypes.imagef((9,27,4))).realize()