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Description:

pytestmongodb 2.4.0

What is this?
This is a pytest plugin, that enables you to test your code that relies on a database connection to
a MongoDB and expects certain data to be present. It allows you to specify fixtures for database
collections in JSON/BSON or YAML format. Under the hood we use the mongomock library, that you
should consult for documentation on how to use MongoDB mock objects. If suitable you can also use a
real MongoDB server.
Note: This project has been renamed from humongous to pytest-mongodb in order to conform
to the pytest plugin naming convention and to be easier to find on the Python package index. See the
migration section for more information.

Configuration
If you don’t want to put your database fixtures on the top-level directory of your package you have
to specify a directory where pytest-mongodb looks for your data definitions.
To do so put a line like the following under the pytest section of your pytest.ini-file put
a
[pytest]
mongodb_fixture_dir =
tests/unit/fixtures
pytest-mongodb would then look for files ending in .yaml or .json in that directory.
If you want only a subset of the available fixtures to be loaded, you can use the mongodb_fixtures
config option. It takes a list of collection file-names without the file-extension. E.g.:
[pytest]
mongodb_fixtures =
players
championships
In this case only the collections “players” and “championships” will be loaded.
You can also choose to use a real MongoDB server for your tests. In that case you might also want to
configure the hostname and/or the credentials if you don’t want to stick with the default (localhost
and no credentials). Use the following configuration values in your pytest.ini to adapt the
settings to your needs:
[pytest]
mongodb_engine = pymongo
mongodb_host = mongodb://user:passwd@server.tld
mongodb_dbname = mydbname
For Mac users, who installed mongodb using homebrew, you can configure the executable to be picked up from /usr/local/bin/mongod instead of /usr/local/bin/mongod by using mongo_exec = /usr/local/bin/mongod in the pytest.ini file.

Basic usage
After you configured pytest-mongodb so that it can find your fixtures you’re ready to specify
some data. Regardless of the markup language you choose, the data is provided as a list of documents
(dicts). The collection that these documents are being inserted into is given by the filename of
your fixture-file. E.g.: If you had a file named players.yaml with the following content:
- name: Mario
surname: Götze
position: striker

- name: Manuel
surname: Neuer
position: keeper
you’d end up with a collection players that has the above player definitions inserted. If your
fixture file is in JSON/BSON format you can also use BSON specific types like $oid, $date,
etc.
You get ahold of the database in your test-function by using the mongodb fixture like so:
def test_players(mongodb):
assert 'players' in mongodb.list_collection_names()
manuel = mongodb.players.find_one({'name': 'Manuel'})
assert manuel['surname'] == 'Neuer'
For further information refer to the mongomock documentation.
If you want to skip specific tests if the engine is ie. a mongomock engine you could do that like
so:
from pytest_mongodb.plugin import mongo_engine
from pytest import mark

@mark.skipif(mongo_engine() == 'mongomock', reason="mongomock does not support that")
def test_players(mongodb):
assert 'players' in mongodb.list_collection_names()
manuel = mongodb.players.find_one({'name': 'Manuel'})
assert manuel['surname'] == 'Neuer'

Migration from humongous
In the course of migrating the package name from humongous to pytest-mongodb most
configuration values which previously were prefixed with humongous_ have been renamed to a
mongodb_-prefixed counterpart. The only notable exception is the humongous_basedir config
value, which now is named mongodb_fixture_dir. Additionally the commandline options have been
unified, in a way that multi-word option names are now consistently separated with dashes instead of
underscores.