AttributeError: 'CommandCursor' object has no attribute 'to_list'

[Alxe]

The function pymongo.command_cursor.CommandCursor.to_list is not present in mongomock.

>       return aggregation.to_list()
E       AttributeError: 'CommandCursor' object has no attribute 'to_list'

This can easily be worked-around by using list(aggregation), but using the n parameters could be trickier depending on the expected behavior. I'll consider submitting a PR.