Failed pytest in ffi crate when warnings are generated

Author: timsaucer

examples/datafusion-ffi-example/Cargo.lock

@@ -37,6 +37,7 @@ arrow = { version = "57" }
 arrow-array = { version = "57" }
 arrow-schema = { version = "57" }
 async-trait = "0.1.89"
+pyo3-log = "0.13.2"
 
 [build-dependencies]
 pyo3-build-config = "0.26"

examples/datafusion-ffi-example/Cargo.toml

@@ -0,0 +1,42 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you 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
+#
+#   http://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.
+
+from __future__ import annotations
+
+import logging
+from typing import TYPE_CHECKING
+
+import pytest
+
+if TYPE_CHECKING:
+    from collections.abc import Generator
+    from typing import Any
+
+
+class _FailOnWarning(logging.Handler):
+    def emit(self, record: logging.LogRecord) -> None:
+        if record.levelno >= logging.WARNING:
+            err = f"Unexpected log warning from '{record.name}': {self.format(record)}"
+            raise AssertionError(err)
+
+
+@pytest.fixture(autouse=True)
+def fail_on_log_warnings() -> Generator[None, Any, None]:
+    handler = _FailOnWarning()
+    logging.root.addHandler(handler)
+    yield
+    logging.root.removeHandler(handler)

examples/datafusion-ffi-example/python/tests/conftest.py

@@ -34,6 +34,8 @@ pub(crate) mod window_udf;
 
 #[pymodule]
 fn datafusion_ffi_example(m: &Bound<'_, PyModule>) -> PyResult<()> {
+    pyo3_log::init();
+
     m.add_class::<MyTableProvider>()?;
     m.add_class::<MyTableFunction>()?;
     m.add_class::<MyCatalogProvider>()?;