airflow: Missing unit tests for some modules in providers package

Description

We have a rule that every file in the providers directory should have tests. This is true in many cases, but there are minor exceptions. https://github.com/apache/airflow/blob/master/tests/test_project_structure.py#L29-L50

• tests/providers/amazon/aws/hooks/test_athena.py
• tests/providers/apache/cassandra/sensors/test_record.py
• tests/providers/apache/cassandra/sensors/test_table.py
• tests/providers/apache/hdfs/sensors/test_web_hdfs.py
• tests/providers/apache/hive/operators/test_vertica_to_hive.py
• tests/providers/apache/pig/operators/test_pig.py
• tests/providers/apache/spark/hooks/test_spark_jdbc_script.py
• tests/providers/cncf/kubernetes/operators/test_kubernetes_pod.py
• tests/providers/google/cloud/operators/test_datastore.py
• tests/providers/google/cloud/operators/test_sql_to_gcs.py
• tests/providers/google/cloud/sensors/test_bigquery.py
• tests/providers/google/cloud/utils/test_field_sanitizer.py
• tests/providers/google/cloud/utils/test_field_validator.py
• tests/providers/google/cloud/utils/test_mlengine_operator_utils.py
• tests/providers/google/cloud/utils/test_mlengine_prediction_summary.py
• tests/providers/jenkins/hooks/test_jenkins.py
• tests/providers/microsoft/azure/sensors/test_azure_cosmos.py
• tests/providers/microsoft/mssql/hooks/test_mssql.py
• tests/providers/oracle/operators/test_oracle.py
• tests/providers/qubole/hooks/test_qubole.py
• tests/providers/samba/hooks/test_samba.py
• tests/providers/sqlite/operators/test_sqlite.py
• tests/providers/yandex/hooks/test_yandex.py

I would be happy if someone would complete the missing tests.

If you decide to finish this ticket you don’t have to do all the work yourself. One PR can only deal with a single file and it’s ok.

Are you wondering how to start contributing to this project? Start by reading our contributor guide

Use case / motivation

Raising test coverage facilitates refactoring and prevents regression.

For the contributor, this is an opportunity to learn more about the structure of the project and to learn better good practices in writing tests in Python.

Related Issues

N/A