Stefan Wojcik 008bb19b0b Add a test covering basic Document operations
It covers operations such as:
1. Document initialization.
2. Accessing/setting attributes on a Document instance.
3. Serializing a Document instance (via `to_mongo`).
4. Deserializing a Document instance (via `_from_son`).
5. Serializing + saving a Document in the database (via `save`).
5. Loading a Document from the database + deserializing (via `Doc.objects[0]`).

And it does so for both basic flat documents and more complex nested docs.
2019-06-14 11:59:41 +02:00
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