Testing custom operators in Apache Airflow - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the base class for custom Airflow operators.

Apache Airflow

from airflow.operators.[1] import BaseOperator

Drag options to blanks, or click blank then click option'

Abash

Bbase

Cpython

Ddummy

Attempts:

3 left

💡 Hint

Common Mistakes

Importing BaseOperator from bash or python operators instead of base.

Trying to import BaseOperator directly from airflow.operators.

The BaseOperator class is imported from airflow.operators.base. This is the base class to create custom operators.

2fill in blank

medium

Complete the code to define the execute method in a custom operator.

Apache Airflow

def execute(self, context):
    self.[1]('Running custom operator logic')

Drag options to blanks, or click blank then click option'

Alog.info

Breturn

Cprint

Draise

Attempts:

3 left

💡 Hint

Common Mistakes

Using print which outputs to stdout instead of structured task logs.

Using log.info without self..

Using return instead of logging.

The execute method runs the operator's logic. Using self.log.info properly logs a message to Airflow's task logger during execution.

3fill in blank

hard

Fix the error in the custom operator's init method by completing the super call.

Apache Airflow

def __init__(self, param1, **kwargs):
    super().[1](param1=param1, **kwargs)

Drag options to blanks, or click blank then click option'

Arun

Bexecute

Cstart

D__init__

Attempts:

3 left

💡 Hint

Common Mistakes

Calling super().execute instead of __init__.

Forgetting to call the parent class's init method.

The __init__ method of the parent class must be called to properly initialize the operator.

4fill in blank

hard

Complete the code to create a test case that checks if the custom operator runs without errors.

Apache Airflow

def test_custom_operator():
    operator = CustomOperator(task_id='test_task')
    result = operator.[1]({})
    assert result is None

Drag options to blanks, or click blank then click option'

Astart

Brun

Cexecute

Dinit

Attempts:

3 left

💡 Hint

Common Mistakes

Calling __init__ or run instead of execute.

Not passing the context dictionary to the execute method.

To test a custom operator, instantiate it and call its execute method with an empty context dictionary. For operators that don't return a value, the result is None.

5fill in blank

hard

Fill all three blanks to complete a test that mocks the logging inside the custom operator.

Apache Airflow

import unittest.mock as mock

def test_logging_in_operator():
    operator = CustomOperator(task_id='log_test')
    with mock.patch.object(operator, 'log') as mock_log:
        operator.[1]({})
        mock_log.[2].assert_called_with('[3]')

Drag options to blanks, or click blank then click option'

Aexecute

Binfo

CRunning custom operator logic

Ddebug

Attempts:

3 left

💡 Hint

Common Mistakes

Using debug instead of info for logging.

Not mocking the correct log method or message.

Wrong patch target for the operator's log.

The test mocks the operator's log instance to check if self.log.info is called with the expected message during execution.