aringeri opened a new issue, #64884:
URL: https://github.com/apache/airflow/issues/64884
### Under which category would you file this issue?
Airflow Core
### Apache Airflow version
3.0.6
### What happened and how to reproduce it?
I am unable to execute unit tests for dags that call the
TriggerDagRunOperator. See my minimal reproducible code below:
### DAG definitions (`./tests/unit/dags/multi_dag.py`)
```python
from airflow.decorators import dag
from airflow.providers.standard.operators.python import PythonOperator
from airflow.providers.standard.operators.trigger_dagrun import
TriggerDagRunOperator
def print_func():
print("Hello from task")
@dag(is_paused_upon_creation=False)
def other_dag():
PythonOperator(
task_id="python_func",
python_callable=print_func
)
@dag(is_paused_upon_creation=False)
def parent_dag() -> None:
TriggerDagRunOperator(
trigger_dag_id="other_dag",
task_id="trigger_other",
conf={"msg": "hello"},
)
parent_dag()
other_dag()
```
### Test Code (`./tests/unit/test_multi_dag.py`)
```python
from pathlib import Path
def test_dag_trigger():
from airflow.models import DagBag
from airflow.utils.state import State
dag_bag = DagBag(
dag_folder=Path(__file__).parent / "dags",
include_examples=False,
)
dag = dag_bag.get_dag(dag_id="parent_dag")
assert dag is not None
run = dag.test()
assert run.state == State.SUCCESS
```
I see the following errors in the logs. This seems to indicate that the
in-process API used for testing does not handle POST to `POST
http://in-process.invalid./dag-runs/<dag-id>/<run-id>`
```
2026-04-08 15:37:47 [debug ] Received message from task runner
[supervisor] msg=TriggerDagRun(logical_date=datetime.datetime(2026, 4, 8, 5,
37, 47, 502552, tzinfo=Timezone('UTC')), conf={'msg': 'hello'},
reset_dag_run=False, dag_id='other_dag',
run_id='manual__2026-04-08T05:37:47.502552+00:00', type='TriggerDagRun')
[2026-04-08T15:37:47.507+1000] {_client.py:1025} INFO - HTTP Request: POST
http://in-process.invalid./dag-runs/other_dag/manual__2026-04-08T05:37:47.502552+00:00
"HTTP/1.1 404 Not Found"
2026-04-08 15:37:47 [warning ] Server error
[airflow.sdk.api.client] detail={'detail': {'reason': 'not_found', 'message':
"DAG with dag_id: 'other_dag' not found"}}
```
[airflow-trigger-dag.logs.txt](https://github.com/user-attachments/files/26559972/airflow-trigger-dag.logs.txt)
### What you think should happen instead?
I would expect the DAG `other_dag` to execute when running `dag.test()`.
### Operating System
macOS
### Deployment
None
### Apache Airflow Provider(s)
_No response_
### Versions of Apache Airflow Providers
_No response_
### Official Helm Chart version
Not Applicable
### Kubernetes Version
_No response_
### Helm Chart configuration
_No response_
### Docker Image customizations
_No response_
### Anything else?
_No response_
### Are you willing to submit PR?
- [ ] Yes I am willing to submit a PR!
### Code of Conduct
- [x] I agree to follow this project's [Code of
Conduct](https://github.com/apache/airflow/blob/main/CODE_OF_CONDUCT.md)
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