DagFileProcessorManager,
    DagFileStat,
    DagParsingSignal,
    DagParsingStat,
)
from airflow.dag_processing.processor import DagFileProcessorProcess
from airflow.models import DagBag, DagModel, DbCallbackRequest, errors
from airflow.models.dagcode import DagCode
from airflow.models.serialized_dag import SerializedDagModel
from airflow.utils import timezone
from airflow.utils.net import get_hostname
from airflow.utils.session import create_session
from tests.core.test_logging_config import SETTINGS_FILE_VALID, settings_context
from tests.models import TEST_DAGS_FOLDER
from tests.test_utils.config import conf_vars
from tests.test_utils.db import clear_db_callbacks, clear_db_dags, clear_db_runs, clear_db_serialized_dags
TEST_DAG_FOLDER = pathlib.Path(__file__).parents[1].resolve() / "dags"
DEFAULT_DATE = timezone.datetime(2016, 1, 1)
class FakeDagFileProcessorRunner(DagFileProcessorProcess):
    
    
    def __init__(self, file_path, pickle_dags, dag_ids, dag_directory, callbacks):
        super().__init__(file_path, pickle_dags, dag_ids, dag_directory, callbacks)
        
        readable, writable = multiprocessing.Pipe(duplex=False)
        writable.send("abc")
        writable.close()
        self._waitable_handle = readable
        self._result = 0, 0
    def start(self):