[DO NOT MERGE] Add marker propagation verification test suite (expected to fail)

src/maxtext/integration/vllm/maxtext_vllm_adapter/adapter.py

@@ -323,4 +323,4 @@ def load_weights(self, rng_key: jax.Array) -> None:
       model = model_creation_utils.from_pretrained(
           self.maxtext_config, mesh=self.mesh, model_mode=self.model_mode, rng_key=rng_key
       )
-      self.model = nnx.data(model)
+      self.model = nnx.data(model)

tests/unit/marker_propagation_test.py

@@ -0,0 +1,60 @@
+# Copyright 2026 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Unit tests validating pytest marker propagation through decorator stacks."""
+
+import functools
+import unittest
+
+from absl.testing import parameterized
+import jax
+import pytest
+
+
+def dummy_decorator(func):
+  """Standard transparent wrapper decorator preserving function metadata."""
+
+  @functools.wraps(func)
+  def wrapper(*args, **kwargs):
+    return func(*args, **kwargs)
+
+  return wrapper
+
+
+class MarkerPropagationTest(parameterized.TestCase):
+  """Validates that pytest markers propagate correctly through decorator stacks."""
+
+  @pytest.mark.cpu_only
+  @parameterized.named_parameters(
+      {"testcase_name": "default", "unused": None},
+  )
+  def test_parameterized_cpu_only_marker_propagation(self, unused):
+    """Verifies cpu_only marker above @parameterized propagates to generated methods."""
+    has_tpu = any(d.platform == "tpu" for d in jax.devices())
+    has_gpu = any(d.platform == "gpu" for d in jax.devices())
+    assert not has_tpu, "cpu_only parameterized test accidentally executed on TPU hardware"
+    assert not has_gpu, "cpu_only parameterized test accidentally executed on GPU hardware"
+
+  @pytest.mark.cpu_only
+  @dummy_decorator
+  def test_standard_decorator_cpu_only_marker_propagation(self):
+    """Verifies cpu_only marker above standard decorators propagates correctly."""
+    has_tpu = any(d.platform == "tpu" for d in jax.devices())
+    has_gpu = any(d.platform == "gpu" for d in jax.devices())
+    assert not has_tpu, "cpu_only standard decorated test accidentally executed on TPU hardware"
+    assert not has_gpu, "cpu_only standard decorated test accidentally executed on GPU hardware"
+
+
+if __name__ == "__main__":
+  unittest.main()