old_contents: import pytest
  import pymongo
  import motor.motor_asyncio
  from aiohttp.test_utils import make_mocked_coro
  
  import virtool.db.iface
  
  
  class MockDeleteResult:
  
      def __init__(self, deleted_count):
          self.deleted_count = deleted_count
  
  
  @pytest.fixture()
  def test_db_name(worker_id):
      return "vt-test-{}".format(worker_id)
  
  
  @pytest.fixture
  def test_db(test_db_name):
      client = pymongo.MongoClient()
      client.drop_database(test_db_name)
  
      yield client[test_db_name]
  
      client.drop_database(test_db_name)
  
  
  @pytest.fixture
  def test_motor(test_db, test_db_name, loop):
      client = motor.motor_asyncio.AsyncIOMotorClient(io_loop=loop)
      loop.run_until_complete(client.drop_database(test_db_name))
      yield client[test_db_name]
      loop.run_until_complete(client.drop_database(test_db_name))
  
  
  @pytest.fixture
  def test_dbi(test_motor, loop):
      i = virtool.db.iface.DB(test_motor, make_mocked_coro(), loop)
      loop.run_until_complete(i.connect())
      return i
  
  
  @pytest.fixture
  def create_delete_result():
      return MockDeleteResult
  
new_contents: import pytest
  import pymongo
  import motor.motor_asyncio
  from aiohttp.test_utils import make_mocked_coro
  
  import virtool.db.iface
  
  
  class MockDeleteResult:
  
      def __init__(self, deleted_count):
          self.deleted_count = deleted_count
  
  
  @pytest.fixture()
  def test_db_name(worker_id):
      return "vt-test-{}".format(worker_id)
  
  
  @pytest.fixture
  def test_db(test_db_name):
      client = pymongo.MongoClient()
      client.drop_database(test_db_name)
  
      yield client[test_db_name]
  
      client.drop_database(test_db_name)
  
  
  @pytest.fixture
  def test_motor(test_db, test_db_name, loop):
      client = motor.motor_asyncio.AsyncIOMotorClient(io_loop=loop)
      loop.run_until_complete(client.drop_database(test_db_name))
      yield client[test_db_name]
      loop.run_until_complete(client.drop_database(test_db_name))
  
  
  @pytest.fixture
  def test_dbi(test_motor, loop):
      i = virtool.db.iface.DB(test_motor, make_mocked_coro(), loop)
      loop.run_until_complete(i.connect())
      return i
  
  
  @pytest.fixture(params=[True, False])
  def id_exists(mocker, request):
      mock = mocker.patch("virtool.db.utils.id_exists", make_mocked_coro(request.param))
  
      setattr(mock, "value", request.param)
  
      return mock
  
  
  @pytest.fixture
  def create_delete_result():
      return MockDeleteResult
  
subject: Add fixture for patching id_exists db util