v2.2.0 `list_collection_names` Breaking Change

[AlecRosenbaum]

The hasattr call below seems to always pass, meaning that the new function is called even if it doesn't exist (making this a breaking change from 2.1.2 -> 2.2.0):

pytest-mongodb/pytest_mongodb/plugin.py

Lines 90 to 93 in b17fe96

	def list_collection_names(db):
	if hasattr(db, 'list_collection_names'):
	return db.list_collection_names()
	return db.collection_names(include_system_collections=False)

Example (partially omitted for legibility):

>>> db
Database(MongoClient(...), 'mydb')

>>> db.collection_names(include_system_collections=False)
['mycollection', ...]

>>> hasattr(db, 'list_collection_names')
True

>>> db.list_collection_names()
TypeError: 'Collection' object is not callable.

>>> hasattr(db, 'this is a nonsense string')
True

Introduced with 982ad12

I suspect insert_many will have the same issue.