Add simple pandas-sqlalchemy compatibility test (#37779)

tests/always/test_pandas.py

@@ -0,0 +1,57 @@
+# 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 pytest
+from sqlalchemy import create_engine
+
+from airflow.configuration import conf
+
+pd = pytest.importorskip("pandas")
+pytestmark = pytest.mark.db_test
+
+
+@pytest.mark.backend("postgres", "mysql")
+class TestPandasSQLAlchemyCompatibility:
+    @pytest.fixture(autouse=True)
+    def setup_test_cases(self):
+        self.temp_table = "test_to_pandas"
+        uri = conf.get_mandatory_value("database", "sql_alchemy_conn")
+        self.engine = create_engine(uri)
+        yield
+        if self.engine:
+            with self.engine.begin() as conn:
+                conn.execute(f"DROP TABLE IF EXISTS {self.temp_table};")
+            self.engine.dispose()
+
+    def test_write_read_to_db(self):
+        pd.DataFrame({"a": [0, 1, 2, 3]}).to_sql(self.temp_table, self.engine)
+        pd.read_sql(f"SELECT * FROM {self.temp_table}", self.engine)
+
+
+class TestPandasSQLAlchemyCompatibilitySQLite:
+    @pytest.fixture(autouse=True)
+    def setup_test_cases(self):
+        self.temp_table = "test_to_pandas"
+        self.engine = create_engine("sqlite:///:memory:")
+        yield
+        if self.engine:
+            self.engine.dispose()
+
+    def test_write_read_to_db(self):
+        pd.DataFrame({"a": [0, 1, 2, 3]}).to_sql(self.temp_table, self.engine)
+        pd.read_sql(f"SELECT * FROM {self.temp_table}", self.engine)