async def test_create_instance_with_custom_event_loop(self):
custom_event_loop = get_event_loop_policy().new_event_loop()
dbm = db.MongoDBManager(DATABASE_SETTING, loop=custom_event_loop)
await dbm.init_connections()
assert id(dbm._loop) == id(custom_event_loop)
assert dbm.is_init is True
for connection in dbm.connections.values():
assert connection.io_loop == custom_event_loop
async def test_is_singleton(self, event_loop):
# First instance
dbm = await db.MongoDBManager(DATABASE_SETTING, event_loop).init_connections()
assert dbm._instance == dbm
# Second instance
dbm_clone = db.MongoDBManager(DATABASE_SETTING, event_loop)
assert dbm_clone == dbm
assert dbm_clone._instance == dbm
# Third instance after one more import
re_imported_db = importlib.import_module('pydantic_odm.db', 'pydantic_odm')
after_import = re_imported_db.MongoDBManager( # noqa
DATABASE_SETTING, event_loop
)
assert after_import._instance == dbm
assert after_import == dbm
async def test_create_instance(self):
raise_msg = 'This is singleton object'
with pytest.raises(TypeError, match=raise_msg):
db.MongoDBManager()