Metadata-Version: 2.3 Name: mongomock Version: 4.2.0.post1 Summary: Fake pymongo stub for testing simple MongoDB-dependent code Project-URL: Homepage, https://github.com/mongomock/mongomock Project-URL: Changelog, https://github.com/mongomock/mongomock/blob/develop/CHANGELOG.md Author-email: Rotem Yaari , Martin Domke , Pascal Corpet License: ISC License Copyright (c) 2024, Monogomock Contributors Permission to use, copy, modify, and/or distribute this software for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies. THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. License-File: LICENSE Classifier: Development Status :: 5 - Production/Stable Classifier: Intended Audience :: Developers Classifier: License :: OSI Approved :: ISC License (ISCL) Classifier: Operating System :: MacOS :: MacOS X Classifier: Operating System :: Microsoft :: Windows Classifier: Operating System :: POSIX Classifier: Programming Language :: Python :: 3 Classifier: Programming Language :: Python :: 3.8 Classifier: Programming Language :: Python :: 3.9 Classifier: Programming Language :: Python :: 3.10 Classifier: Programming Language :: Python :: 3.11 Classifier: Programming Language :: Python :: 3.12 Classifier: Programming Language :: Python :: Implementation :: CPython Classifier: Programming Language :: Python :: Implementation :: PyPy Classifier: Topic :: Database Requires-Dist: packaging Requires-Dist: pytz Requires-Dist: sentinels Provides-Extra: pyexecjs Requires-Dist: pyexecjs; extra == 'pyexecjs' Provides-Extra: pymongo Requires-Dist: pymongo; extra == 'pymongo' Description-Content-Type: text/x-rst .. image:: https://img.shields.io/pypi/v/mongomock.svg?style=flat-square :target: https://pypi.python.org/pypi/mongomock .. image:: https://img.shields.io/github/actions/workflow/status/mongomock/mongomock/lint-and-test.yml?branch=develop&style=flat-square :target: https://github.com/mongomock/mongomock/actions?query=workflow%3Alint-and-test .. image:: https://img.shields.io/pypi/l/mongomock.svg?style=flat-square :target: https://pypi.python.org/pypi/mongomock .. image:: https://img.shields.io/codecov/c/github/mongomock/mongomock.svg?style=flat-square :target: https://codecov.io/gh/mongomock/mongomock What is this? ------------- Mongomock is a small library to help testing Python code that interacts with MongoDB via Pymongo. To understand what it's useful for, we can take the following code: .. code-block:: python def increase_votes(collection): for document in collection.find(): collection.update_one(document, {'$set': {'votes': document['votes'] + 1}}) The above code can be tested in several ways: 1. It can be tested against a real mongodb instance with pymongo. 2. It can receive a record-replay style mock as an argument. In this manner we record the expected calls (find, and then a series of updates), and replay them later. 3. It can receive a carefully hand-crafted mock responding to find() and update() appropriately. Option number 1 is obviously the best approach here, since we are testing against a real mongodb instance. However, a mongodb instance needs to be set up for this, and cleaned before/after the test. You might want to run your tests in continuous integration servers, on your laptop, or other bizarre platforms - which makes the mongodb requirement a liability. We are left with #2 and #3. Unfortunately they are very high maintenance in real scenarios, since they replicate the series of calls made in the code, violating the DRY rule. Let's see #2 in action - we might write our test like so: .. code-block:: python def test_increase_votes(): objects = [dict(...), dict(...), ...] collection_mock = my_favorite_mock_library.create_mock(Collection) record() collection_mock.find().AndReturn(objects) for obj in objects: collection_mock.update_one(obj, {'$set': {'votes': obj['votes']}}) replay() increase_votes(collection_mock) verify() Let's assume the code changes one day, because the author just learned about the '$inc' instruction: .. code-block:: python def increase_votes(collection): collection.update_many({}, {'$inc': {'votes': 1}}) This breaks the test, although the end result being tested is just the same. The test also repeats large portions of the code we already wrote. We are left, therefore, with option #3 -- you want something to behave like a mongodb database collection, without being one. This is exactly what this library aims to provide. With mongomock, the test simply becomes: .. code-block:: python def test_increase_votes(): collection = mongomock.MongoClient().db.collection objects = [dict(votes=1), dict(votes=2), ...] for obj in objects: obj['_id'] = collection.insert_one(obj).inserted_id increase_votes(collection) for obj in objects: stored_obj = collection.find_one({'_id': obj['_id']}) stored_obj['votes'] -= 1 assert stored_obj == obj # by comparing all fields we make sure only votes changed This code checks *increase_votes* with respect to its functionality, not syntax or algorithm, and therefore is much more robust as a test. If the code to be tested is creating the connection itself with pymongo, you can use mongomock.patch (NOTE: you should use :code:`pymongo.MongoClient(...)` rather than :code:`from pymongo import MongoClient`, as shown below): .. code-block:: python @mongomock.patch(servers=(('server.example.com', 27017),)) def test_increate_votes_endpoint(): objects = [dict(votes=1), dict(votes=2), ...] client = pymongo.MongoClient('server.example.com') client.db.collection.insert_many(objects) call_endpoint('/votes') ... verify client.db.collection Important Note About Project Status & Development ------------------------------------------------- MongoDB is complex. This library aims at a reasonably complete mock of MongoDB for testing purposes, not a perfect replica. This means some features are not likely to make it in any time soon. Also, since many corner cases are encountered along the way, our goal is to try and TDD our way into completeness. This means that every time we encounter a missing or broken (incompatible) feature, we write a test for it and fix it. There are probably lots of such issues hiding around lurking, so feel free to open issues and/or pull requests and help the project out! **NOTE**: We don't include pymongo functionality as "stubs" or "placeholders". Since this library is used to validate production code, it is unacceptable to behave differently than the real pymongo implementation. In such cases it is better to throw `NotImplementedError` than implement a modified version of the original behavior. Upgrading to Pymongo v4 ----------------------- The major version 4 of Pymongo changed the API quite a bit. The Mongomock library has evolved to help you ease the migration: 1. Upgrade to Mongomock v4 or above: if your tests are running with Pymongo installed, Mongomock will adapt its own API to the version of Pymongo installed. 2. Upgrade to Pymongo v4 or above: your tests using Mongomock will fail exactly where your code would fail in production, so that you can fix it before releasing. Contributing ------------ When submitting a PR, please make sure that: 1. You include tests for the feature you are adding or bug you are fixing. Preferably, the test should compare against the real MongoDB engine (see `examples in tests`_ for reference). 2. No existing test got deleted or unintentionally castrated 3. The build passes on your PR. To download, setup and perfom tests, run the following commands on Mac / Linux: .. code-block:: console $ git clone git@github.com:mongomock/mongomock.git $ pipx install hatch $ cd mongomock $ hatch test Alternatively, docker-compose can be used to simplify dependency management for local development: .. code-block:: console $ git clone git@github.com:mongomock/mongomock.git $ cd mongomock $ docker compose build $ docker compose run --rm mongomock If you want to run ``hatch`` against a specific environment in the container: .. code-block:: console $ docker compose run --rm mongomock hatch test -py=3.11 -i pymongo=4 If you'd like to run only one test, you can also add the test name at the end of your command: .. code-block:: console $ docker compose run --rm mongomock hatch test -py=3.12 -i pymongo=4 tests/test__mongomock.py::MongoClientCollectionTest::test__insert NOTE: If the MongoDB image was updated, or you want to try a different MongoDB version in ``docker-compose``, you'll have to issue a ``docker compose down`` before you do anything else to ensure you're running against the intended version. utcnow ~~~~~~ When developing features that need to make use of "now," please use the libraries :code:`utcnow` helper method in the following way: .. code-block:: python import mongomock # Awesome code! now_reference = mongomock.utcnow() This provides users a consistent way to mock the notion of "now" in mongomock if they so choose. Please see `utcnow docstring for more details `_. Branching model ~~~~~~~~~~~~~~~ The branching model used for this project follows the `gitflow workflow`_. This means that pull requests should be issued against the `develop` branch and *not* the `master` branch. If you want to contribute to the legacy 2.x branch then your pull request should go into the `support/2.x` branch. Releasing ~~~~~~~~~ When ready for a release, tag the `develop` branch with a new tag (please keep semver names) and push your tags to GitHub. The CI should do the rest. To add release notes, create a release in GitHub's `Releases Page `_ then generate the release notes locally with: .. code-block:: bash python -c "from pbr import git; git.write_git_changelog()" Then you can get the relevant section in the generated `Changelog` file. Acknowledgements ---------------- Mongomock has originally been developed by `Rotem Yaari `_, then by `Martin Domke `_. It is currently being developed and maintained by `Pascal Corpet `_ . Also, many thanks go to the following people for helping out, contributing pull requests and fixing bugs: * Alec Perkins * Alexandre Viau * Austin W Ellis * Andrey Ovchinnikov * Arthur Hirata * Baruch Oxman * Corey Downing * Craig Hobbs * Daniel Murray * David Fischer * Diego Garcia * Dmitriy Kostochko * Drew Winstel * Eddie Linder * Edward D'Souza * Emily Rosengren * Eugene Chernyshov * Grigoriy Osadchenko * Israel Teixeira * Jacob Perkins * Jason Burchfield * Jason Sommer * Jeff Browning * Jeff McGee * Joël Franusic * `Jonathan Hedén `_ * Julian Hille * Krzysztof Płocharz * Lyon Zhang * `Lucas Rangel Cezimbra `_ * Marc Prewitt * Marcin Barczynski * Marian Galik * Michał Albrycht * Mike Ho * Nigel Choi * Omer Gertel * Omer Katz * Papp Győző * Paul Glass * Scott Sexton * Srinivas Reddy Thatiparthy * Taras Boiko * Todd Tomkinson * `Xinyan Lu `_ * Zachary Carter * catty (ca77y _at_ live.com) * emosenkis * hthieu1110 * יppetlinskiy * pacud * tipok * waskew (waskew _at_ narrativescience.com) * jmsantorum (jmsantorum [at] gmail [dot] com) * lidongyong * `Juan Gutierrez `_ .. _examples in tests: https://github.com/mongomock/mongomock/blob/develop/tests/test__mongomock.py .. _gitflow workflow: https://www.atlassian.com/git/tutorials/comparing-workflows/gitflow-workflow