mocking

Monkeypatching/mocking the HTTPX external requests Question: I’m trying to monkeypatch the external request. Here is the code of a web endpoint: import httpx, json … @app.get(‘/test’) async def view_test(request): async with httpx.AsyncClient() as client: # sending external request api_response = await client.get( f’https://jsonplaceholder.typicode.com/todos/1′, timeout=10, ) resp = api_response.json() # modifying the result resp[‘foo’] = 0 …

Is it possible to monkeypatch all objects of a class regardless of initialisation method? Question: I’m testing some code that manipulates data using pandas, and I want to avoid writing out the data during tests. Let’s say my code in a file name module.py is this: import pandas as pd import dask.dataframe as dd def …

Python Unit test a function imported by the function under test Question: I’m attempting to implement thorough testing of code that calls to a database at various at points. I’m able to mock the calls that occur in the function under test, but I’m now also needing to stub out functions that are imported by …

Mock object with pyTest Question: I have a function I need to test: def get_user_by_username(db, username: str) -> Waiter: """Get user object based on given username.""" user = db.query(Waiter).filter(Waiter.username == username).first() return user Here I try to mock DB call and return correct Waiter object, so my test is: def test_get_user_by_username(mocker): waiter = Waiter(id=10, username="string", …

Patch Django EmailMultiAlternatives send() in a Celery Task so that an exception is raised Question: I want to test a Celery Task by raising an SMTPException when sending an email. With the following code, located in: my_app.mailer.tasks from django.core.mail import EmailMultiAlternatives @app.task(bind=True ) def send_mail(self): subject, from_email, to = ‘hello’, ‘[email protected]’, ‘[email protected]’ text_content = ‘This …

Mock patch the return value of an inner function that's not returned from the outer function Question: I’d like to capture the return value of an inner function without having to explicitly return that return value from the outer function. So I’d like to do something like this: # bar.py import foo def my_fn(): foo.fn() …

Hard to understand return_value for Python Mock Class in the following example Question: I had a hard time understanding the choice of using return_value. See the following example # my_module.py def query(connection): cursor = connection.cursor() cursor.execute("SELECT name FROM users WHERE id = 1") return cursor.fetchone()[0] # test_query.py import pytest from unittest.mock import Mock # Import …

How to mock a function which gets executed during the import time? Question: Here the ABC() and obj.print_1() get called during the import time and it prints "making object" and "printed 1" respectively. How can we mock all the three functions, __init__(), print_1(), and print_2()? xyz.py from abc import ABC obj = ABC() obj.print_1() def …

How do I remove a handler from a loguru.logger when using pytest? Question: I wrote a Thing class that does logging using loguru. At the bottom of the class file I add a handler to the logger. This is what thing.py looks like. from loguru import logger class Thing: def __init__(self): logger.info("Thing created") def __enter__(self): …

How to mock a class with nested properties and autospec? Question: I’m wondering if it’s possible to mock a class which contains properties by using patch and autospec? The goal in the example below is to mock (recursively) ClassB. Example: # file: class_c.py class ClassC: def get_default(self) -> list[int]: return [1, 2, 3] def delete(self, …