[tune/core] serialization debugging utility (#12142)

Co-authored-by: SangBin Cho <rkooo567@gmail.com>
Co-authored-by: Kai Fricke <kai@anyscale.com>

python/ray/tests/conftest.py

@@ -1,7 +1,7 @@
 """
 This file defines the common pytest fixtures used in current directory.
 """
-
+import os
 from contextlib import contextmanager
 import pytest
 import subprocess
@@ -204,6 +204,13 @@ def call_ray_stop_only():
     subprocess.check_call(["ray", "stop"])
 
 
+@pytest.fixture
+def enable_pickle_debug():
+    os.environ["RAY_PICKLE_VERBOSE_DEBUG"] = "1"
+    yield
+    del os.environ["RAY_PICKLE_VERBOSE_DEBUG"]
+
+
 @pytest.fixture()
 def two_node_cluster():
     system_config = {