Best effort mock for AsyncIOMotorClient (Database, Collection, e.t.c) built on top of mongomock library.
from mongomock_motor import AsyncMongoMockClient
async def test_mock_client():
collection = AsyncMongoMockClient()['tests']['test-1']
assert await collection.find({}).to_list(None) == []
result = await collection.insert_one({'a': 1})
assert result.inserted_id
assert len(await collection.find({}).to_list(None)) == 1