Add unit tests to Apache Kafka hooks

airflow/providers/apache/kafka/hooks/base.py

@@ -40,7 +40,6 @@ def __init__(self, kafka_config_id=default_conn_name, *args, **kwargs):
         """Initialize our Base."""
         super().__init__()
         self.kafka_config_id = kafka_config_id
-        self.get_conn
 
     @classmethod
     def get_ui_field_behaviour(cls) -> dict[str, Any]:
@@ -74,6 +73,6 @@ def test_connection(self) -> tuple[bool, str]:
             if t:
                 return True, "Connection successful."
         except Exception as e:
-            False, str(e)
+            return False, str(e)
 
         return False, "Failed to establish connection."

tests/always/test_project_structure.py

@@ -83,7 +83,6 @@ def test_providers_modules_should_have_tests(self):
             "tests/providers/apache/hdfs/log/test_hdfs_task_handler.py",
             "tests/providers/apache/hdfs/sensors/test_hdfs.py",
             "tests/providers/apache/hive/plugins/test_hive.py",
-            "tests/providers/apache/kafka/hooks/test_base.py",
             "tests/providers/celery/executors/test_celery_executor_utils.py",
             "tests/providers/celery/executors/test_default_celery.py",
             "tests/providers/cncf/kubernetes/backcompat/test_backwards_compat_converters.py",

tests/providers/apache/kafka/hooks/test_base.py

@@ -0,0 +1,81 @@
+# 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
+
+from unittest import mock
+from unittest.mock import MagicMock
+
+import pytest
+
+from airflow.providers.apache.kafka.hooks.base import KafkaBaseHook
+
+
+class SomeKafkaHook(KafkaBaseHook):
+    def _get_client(self, config):
+        return config
+
+
+@pytest.fixture
+def hook():
+    return SomeKafkaHook()
+
+
+TIMEOUT = 10
+
+
+class TestKafkaBaseHook:
+    @mock.patch("airflow.hooks.base.BaseHook.get_connection")
+    def test_get_conn(self, mock_get_connection, hook):
+        config = {"bootstrap.servers": MagicMock()}
+        mock_get_connection.return_value.extra_dejson = config
+        assert hook.get_conn == config
+
+    @mock.patch("airflow.hooks.base.BaseHook.get_connection")
+    def test_get_conn_value_error(self, mock_get_connection, hook):
+        mock_get_connection.return_value.extra_dejson = {}
+        with pytest.raises(ValueError, match="must be provided"):
+            hook.get_conn()
+
+    @mock.patch("airflow.providers.apache.kafka.hooks.base.AdminClient")
+    @mock.patch("airflow.hooks.base.BaseHook.get_connection")
+    def test_test_connection(self, mock_get_connection, admin_client, hook):
+        config = {"bootstrap.servers": MagicMock()}
+        mock_get_connection.return_value.extra_dejson = config
+        connection = hook.test_connection()
+        admin_client.assert_called_once_with(config, timeout=10)
+        assert connection == (True, "Connection successful.")
+
+    @mock.patch(
+        "airflow.providers.apache.kafka.hooks.base.AdminClient",
+        return_value=MagicMock(list_topics=MagicMock(return_value=[])),
+    )
+    @mock.patch("airflow.hooks.base.BaseHook.get_connection")
+    def test_test_connection_no_topics(self, mock_get_connection, admin_client, hook):
+        config = {"bootstrap.servers": MagicMock()}
+        mock_get_connection.return_value.extra_dejson = config
+        connection = hook.test_connection()
+        admin_client.assert_called_once_with(config, timeout=TIMEOUT)
+        assert connection == (False, "Failed to establish connection.")
+
+    @mock.patch("airflow.providers.apache.kafka.hooks.base.AdminClient")
+    @mock.patch("airflow.hooks.base.BaseHook.get_connection")
+    def test_test_connection_exception(self, mock_get_connection, admin_client, hook):
+        config = {"bootstrap.servers": MagicMock()}
+        mock_get_connection.return_value.extra_dejson = config
+        admin_client.return_value.list_topics.side_effect = [ValueError("some error")]
+        connection = hook.test_connection()
+        assert connection == (False, "some error")

tests/providers/apache/kafka/hooks/test_client.py

@@ -18,9 +18,11 @@
 
 import json
 import logging
+from unittest.mock import MagicMock, patch
 
 import pytest
-from confluent_kafka.admin import AdminClient
+from confluent_kafka import KafkaException
+from confluent_kafka.admin import AdminClient, NewTopic
 
 from airflow.models import Connection
 from airflow.providers.apache.kafka.hooks.client import KafkaAdminClientHook
@@ -31,11 +33,7 @@
 log = logging.getLogger(__name__)
 
 
-class TestSampleHook:
-    """
-    Test Admin Client Hook.
-    """
-
+class TestKafkaAdminClientHook:
     def setup_method(self):
         db.merge_conn(
             Connection(
@@ -54,23 +52,48 @@ def setup_method(self):
                 extra=json.dumps({"socket.timeout.ms": 10}),
             )
         )
-
-    def test_init(self):
-        """test initialization of AdminClientHook"""
-
-        # Standard Init
-        KafkaAdminClientHook(kafka_config_id="kafka_d")
-
-        # # Not Enough Args
-        with pytest.raises(ValueError):
-            KafkaAdminClientHook(kafka_config_id="kafka_bad")
+        self.hook = KafkaAdminClientHook(kafka_config_id="kafka_d")
 
     def test_get_conn(self):
-        """test get_conn"""
-
-        # Standard Init
-        k = KafkaAdminClientHook(kafka_config_id="kafka_d")
-
-        c = k.get_conn
-
-        assert isinstance(c, AdminClient)
+        assert isinstance(self.hook.get_conn, AdminClient)
+
+    @patch(
+        "airflow.providers.apache.kafka.hooks.client.AdminClient",
+    )
+    def test_create_topic(self, admin_client):
+        mock_f = MagicMock()
+        admin_client.return_value.create_topics.return_value = {"topic_name": mock_f}
+        self.hook.create_topic(topics=[("topic_name", 0, 1)])
+        admin_client.return_value.create_topics.assert_called_with([NewTopic("topic_name", 0, 1)])
+        mock_f.result.assert_called_once()
+
+    @patch(
+        "airflow.providers.apache.kafka.hooks.client.AdminClient",
+    )
+    def test_create_topic_error(self, admin_client):
+        mock_f = MagicMock()
+        kafka_exception = KafkaException()
+        mock_arg = MagicMock()
+        # mock_arg.name = "TOPIC_ALREADY_EXISTS"
+        kafka_exception.args = [mock_arg]
+        mock_f.result.side_effect = [kafka_exception]
+        admin_client.return_value.create_topics.return_value = {"topic_name": mock_f}
+        with pytest.raises(KafkaException):
+            self.hook.create_topic(topics=[("topic_name", 0, 1)])
+
+    @patch(
+        "airflow.providers.apache.kafka.hooks.client.AdminClient",
+    )
+    def test_create_topic_warning(self, admin_client, caplog):
+        mock_f = MagicMock()
+        kafka_exception = KafkaException()
+        mock_arg = MagicMock()
+        mock_arg.name = "TOPIC_ALREADY_EXISTS"
+        kafka_exception.args = [mock_arg]
+        mock_f.result.side_effect = [kafka_exception]
+        admin_client.return_value.create_topics.return_value = {"topic_name": mock_f}
+        with caplog.at_level(
+            logging.WARNING, logger="airflow.providers.apache.kafka.hooks.client.KafkaAdminClientHook"
+        ):
+            self.hook.create_topic(topics=[("topic_name", 0, 1)])
+            assert "The topic topic_name already exists" in caplog.text

tests/providers/apache/kafka/hooks/test_consume.py

@@ -52,13 +52,7 @@ def setup_method(self):
                 extra=json.dumps({}),
             )
         )
+        self.hook = KafkaConsumerHook(["test_1"], kafka_config_id="kafka_d")
 
-    def test_init(self):
-        """test initialization of AdminClientHook"""
-
-        # Standard Init
-        KafkaConsumerHook(["test_1"], kafka_config_id="kafka_d")
-
-        # Not Enough Args
-        with pytest.raises(ValueError):
-            KafkaConsumerHook(["test_1"], kafka_config_id="kafka_bad")
+    def test_get_consumer(self):
+        assert self.hook.get_consumer() == self.hook.get_conn

tests/providers/apache/kafka/hooks/test_produce.py

@@ -54,13 +54,7 @@ def setup_method(self):
                 extra=json.dumps({}),
             )
         )
+        self.hook = KafkaProducerHook(kafka_config_id="kafka_d")
 
-    def test_init(self):
-        """test initialization of AdminClientHook"""
-
-        # Standard Init
-        KafkaProducerHook(kafka_config_id="kafka_d")
-
-        # Not Enough Args
-        with pytest.raises(ValueError):
-            KafkaProducerHook(kafka_config_id="kafka_bad")
+    def test_get_producer(self):
+        assert self.hook.get_producer() == self.hook.get_conn