Skep new experimental functionality tests failing on macos.

PiperOrigin-RevId: 836667149

Author: iindyk

grain/_src/python/dataset/transformations/prefetch_test.py

@@ -1179,7 +1179,6 @@ def test_no_mem_leak(self):
       for _ in range(5):
         _ = next(it)
 
-  @absltest.skipIf(platform.system() == 'Darwin', 'Fails on macos-14 runner.')
   @parameterized.parameters([True, False])
   def test_no_mem_leak_with_double_prefetch(self, close: bool):
     ds = (
@@ -1200,6 +1199,7 @@ def test_no_mem_leak_with_double_prefetch(self, close: bool):
       if close:
         it.close()  # pytype: disable=attribute-error
 
+  @absltest.skipIf(platform.system() == 'Darwin', 'Fails on macos-14 runner.')
   @parameterized.parameters([True, False])
   def test_early_break_continues_prefetching(self, close: bool):
     count = 0

grain/_src/python/variable_size_queue_test.py

@@ -13,6 +13,7 @@
 # limitations under the License.
 """Tests for variable size queue implementations."""
 
+import platform
 import queue
 import threading
 import time
@@ -245,6 +246,7 @@ def _blocking_put():
     self.assertEqual(q.get(), 3)
     t.join()
 
+  @absltest.skipIf(platform.system() == "Darwin", "Fails on macos-14 runner.")
   def test_put_blocks_until_item_is_retrieved_from_process(self):
     ctx = mp.get_context("spawn")
     q = variable_size_queue.VariableSizeMultiprocessingQueue(1, ctx=ctx)