Convert conftest-patch.py to a pytest plugin for pandas testing

ci/cudf_pandas_scripts/pandas-tests/run.sh

@@ -39,8 +39,6 @@ timeout 90m bash python/cudf/cudf/pandas/scripts/run-pandas-tests.sh \
   --durations=10 \
   --numprocesses 8 \
   --tb=line \
-  --disable-warnings \
-  -m "not slow and not single_cpu and not db and not network" \
   --max-worker-restart=3 \
   --junitxml="${RAPIDS_TESTS_DIR}/junit-cudf-pandas.xml" \
   --dist worksteal \

pyproject.toml

@@ -157,8 +157,6 @@ extend-unsafe-fixes = [
 [tool.ruff.lint.per-file-ignores]
 # We use "== None" to demonstrate null handling in this notebook
 "docs/cudf/source/cudf/missing-data.ipynb" = ["E711"]
-# Lots of pytest implicitly injected attributes in conftest-patch.py
-"python/cudf/cudf/pandas/scripts/conftest-patch.py" = ["F821"]
 "python/cudf/cudf/pandas/scripts/*" = ["D"]
 "python/cudf/cudf_pandas_tests/*" = ["D"]
 "ci/*" = ["T201"]

python/cudf/cudf/pandas/_wrappers/pandas.py

@@ -1,6 +1,7 @@
 # SPDX-FileCopyrightText: Copyright (c) 2023-2026, NVIDIA CORPORATION & AFFILIATES.  All rights reserved.
 # SPDX-License-Identifier: Apache-2.0
 import abc
+import contextlib
 import copyreg
 import datetime
 import functools
@@ -1508,6 +1509,33 @@ def _register_index_accessor(name):
     return pd.core.accessor._register_accessor(name, Index)
 
 
+@contextlib.contextmanager
+def null_assert_produces_warning(*args, **kwargs):
+    # We do not want pandas unit tests to fail because
+    # assert_produces_warning doesn't see a warning.
+    # No an explicit public API
+    try:
+        yield []
+    finally:
+        pass
+
+
+@register_proxy_func(pd._testing.assert_produces_warning)
+def _register_assert_produces_warning(*args, **kwargs):
+    return null_assert_produces_warning(*args, **kwargs)
+
+
+def null_raises_chained_assignment_error(*args, **kwargs):
+    # This assertion function also uses assert_produces_warning
+    # we want to ignore in pandas unit tests.
+    return null_assert_produces_warning(*args, **kwargs)
+
+
+@register_proxy_func(pd._testing.raises_chained_assignment_error)
+def _register_raises_chained_assignment_error(*args, **kwargs):
+    return null_raises_chained_assignment_error(*args, **kwargs)
+
+
 @nvtx.annotate(
     "CUDF_PANDAS_DATAFRAME_EVAL",
     color=_CUDF_PANDAS_NVTX_COLORS["EXECUTE_SLOW"],

python/cudf/cudf/pandas/scripts/conftest-patch.py → python/cudf/cudf/pandas/scripts/pandas-testing-plugin.py

@@ -1,9 +1,7 @@
 # SPDX-FileCopyrightText: Copyright (c) 2023-2026, NVIDIA CORPORATION & AFFILIATES.  All rights reserved.
 # SPDX-License-Identifier: Apache-2.0
 
-import contextlib
 import json
-import os
 import sys
 import traceback
 from collections import defaultdict
@@ -24,17 +22,8 @@ def wrapped(*args, **kwargs):
     return wrapper
 
 
-@contextlib.contextmanager
-def null_assert_warnings(*args, **kwargs):
-    try:
-        yield []
-    finally:
-        pass
-
-
 @pytest.fixture(scope="session", autouse=True)
 def patch_testing_functions():
-    tm.assert_produces_warning = null_assert_warnings  # noqa: F821
     pytest.raises = replace_kwargs({"match": None})(pytest.raises)
 
 
@@ -7908,6 +7897,7 @@ def pytest_unconfigure(config):
 }
 
 
+@pytest.hookimpl(trylast=True)
 def pytest_collection_modifyitems(session, config, items):
     for item in items:
         if (reason := NODEIDS_TO_SKIP.get(item.nodeid, None)) is not None:
@@ -7925,6 +7915,3 @@ def pytest_collection_modifyitems(session, config, items):
             item.add_marker(pytest.mark.skip(reason=reason))
         elif (reason := NODEIDS_THAT_FAIL.get(item.nodeid, None)) is not None:
             item.add_marker(pytest.mark.xfail(reason=reason))
-
-
-sys.path.append(os.path.dirname(__file__))

python/cudf/cudf/pandas/scripts/run-pandas-tests.sh

@@ -15,7 +15,6 @@
 #
 # This script creates a `pandas-testing` directory if it doesn't exist
 #
-# If running locally, it's recommended to pass '-m "not slow and not single_cpu and not db"'
 
 set -euo pipefail
 
@@ -91,15 +90,16 @@ EOF
     done
 fi
 
-# append the contents of patch-confest.py to conftest.py
-cat ../python/cudf/cudf/pandas/scripts/conftest-patch.py >> pandas-tests/conftest.py
-
 # Run the tests
 cd pandas-tests/
 
 
-PANDAS_CI="1" python -m pytest -p cudf.pandas \
+PANDAS_CI="1" python -m pytest \
+    -p cudf.pandas \
+    -p cudf.pandas.scripts.pandas-testing-plugin \
     --import-mode=importlib \
+    -m "not slow and not single_cpu and not db and not network" \
+    --disable-warnings \
     "$@"
 
 mv ./*.json ..