Remove unnecessary logs from test output (#38974)

The logs from `fab` and `dag` at info level are useful for PROD
but clutter the output for tests. We should set log level
for those two modules to warning to avoid that.

tests/conftest.py

@@ -1145,6 +1145,17 @@ def reset_logging_config():
     logging.config.dictConfig(logging_config)
 
 
+@pytest.fixture(scope="session", autouse=True)
+def suppress_info_logs_for_dag_and_fab():
+    import logging
+
+    dag_logger = logging.getLogger("airflow.models.dag")
+    dag_logger.setLevel(logging.WARNING)
+
+    fab_logger = logging.getLogger("airflow.providers.fab.auth_manager.security_manager.override")
+    fab_logger.setLevel(logging.WARNING)
+
+
 @pytest.fixture(scope="module", autouse=True)
 def _clear_db(request):
     from tests.test_utils.db import clear_all

tests/models/test_mappedoperator.py

@@ -17,7 +17,6 @@
 # under the License.
 from __future__ import annotations
 
-import logging
 from collections import defaultdict
 from datetime import timedelta
 from typing import TYPE_CHECKING
@@ -73,8 +72,6 @@ def test_task_mapping_with_dag():
 
 @patch("airflow.models.abstractoperator.AbstractOperator.render_template")
 def test_task_mapping_with_dag_and_list_of_pandas_dataframe(mock_render_template, caplog):
-    caplog.set_level(logging.INFO)
-
     class UnrenderableClass:
         def __bool__(self):
             raise ValueError("Similar to Pandas DataFrames, this class raises an exception.")
@@ -95,7 +92,6 @@ def execute(self, context: Context):
         mapped = CustomOperator.partial(task_id="task_2").expand(arg=unrenderable_values)
         task1 >> mapped
     dag.test()
-    assert caplog.text.count("[DAG TEST] end task task_id=task_2") == 2
     assert (
         "Unable to check if the value of type 'UnrenderableClass' is False for task 'task_2', field 'arg'"
         in caplog.text