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October 19, 2018 13:41
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Airflow unit testing DAG (topological order)
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| import pytest | |
| from airflow.hooks.base_hook import BaseHook | |
| from airflow.models import Connection | |
| def create_connection(conn_id, schema=None, *args, **kwargs): | |
| if schema is None: | |
| schema = conn_id | |
| return Connection(conn_id=conn_id, schema=schema, *args, **kwargs) | |
| @pytest.fixture() | |
| def gcp_connection(mocker): | |
| get_connection = mocker.patch.object(BaseHook, 'get_connection') | |
| get_connection.return_value = create_connection('gcp') | |
| return get_connection |
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| from airflow import DAG | |
| from airflow.operators.sensors import ExternalTaskSensor | |
| from airflow.contrib.operators.bigquery_operator import BigQueryOperator | |
| dag = DAG('my_dag') | |
| sensor_1 = ExternalTaskSensor( | |
| external_dag_id='some_other_dag_1', | |
| external_task_id='check_task', | |
| task_id='sensor_1', | |
| dag=dag, | |
| ) | |
| bq_processing = BigQueryOperator( | |
| task_id='bq_processing', | |
| sql='SELECT * FROM my_table', | |
| bigquery_conn_id='gcp', | |
| dag=dag, | |
| ) | |
| bq_processing.set_upstream(sensor_1) |
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| import unittest | |
| import pytest | |
| from airflow.operators.sensors import ExternalTaskSensor | |
| from airflow.contrib.operators.bigquery_operator import BigQueryOperator | |
| from my_dag import dag | |
| @pytest.mark.usefixtures("gcp_connection") | |
| class TestMyDag(unittest.TestCase): | |
| def test_dag_tasks_order(self): | |
| topo_order = dag.topological_sort() | |
| expected_order = [ | |
| ('sensor_1', ExternalTaskSensor), | |
| ('bq_processing', BigQueryOperator), | |
| ] | |
| for index, (name, klass) in enumerate(expected_order): | |
| task = topo_order[index] | |
| assert isinstance(task, klass) | |
| assert task.task_id == name |
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