From 1181e4363b87d6c1054fef29799d2e42fbd63baf Mon Sep 17 00:00:00 2001
From: Subham Sangwan <subhamsangwan26@gmail.com>
Date: Thu, 9 Apr 2026 12:40:51 +0530
Subject: [PATCH] Fix TriggerDagRunOperator 404 in dag.test() by syncing all
 bundle DAGs

---
 .../test_dag_test_trigger_dagrun_operator.py  | 45 +++++++++++++++++++
 airflow-core/tests/unit/models/test_dag.py    | 17 +++++++
 task-sdk/src/airflow/sdk/definitions/dag.py   | 16 +++----
 3 files changed, 68 insertions(+), 10 deletions(-)
 create mode 100644 airflow-core/tests/unit/dags/test_dag_test_trigger_dagrun_operator.py

diff --git a/airflow-core/tests/unit/dags/test_dag_test_trigger_dagrun_operator.py b/airflow-core/tests/unit/dags/test_dag_test_trigger_dagrun_operator.py
new file mode 100644
index 0000000000000..0b2dc4aad0c59
--- /dev/null
+++ b/airflow-core/tests/unit/dags/test_dag_test_trigger_dagrun_operator.py
@@ -0,0 +1,45 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+from __future__ import annotations
+
+from datetime import datetime
+
+from airflow.models.dag import DAG
+from airflow.providers.standard.operators.empty import EmptyOperator
+from airflow.providers.standard.operators.trigger_dagrun import TriggerDagRunOperator
+
+DEFAULT_DATE = datetime(2024, 1, 1)
+
+with DAG(
+    dag_id="test_dag_test_trigger_parent",
+    schedule=None,
+    start_date=DEFAULT_DATE,
+    is_paused_upon_creation=False,
+) as parent_dag:
+    TriggerDagRunOperator(
+        task_id="trigger_target_dag",
+        trigger_dag_id="test_dag_test_trigger_target",
+    )
+
+with DAG(
+    dag_id="test_dag_test_trigger_target",
+    schedule=None,
+    start_date=DEFAULT_DATE,
+    is_paused_upon_creation=False,
+) as target_dag:
+    EmptyOperator(task_id="target_task")
diff --git a/airflow-core/tests/unit/models/test_dag.py b/airflow-core/tests/unit/models/test_dag.py
index 00a0f1a1ef2da..ad02cb243dfb7 100644
--- a/airflow-core/tests/unit/models/test_dag.py
+++ b/airflow-core/tests/unit/models/test_dag.py
@@ -1372,6 +1372,23 @@ def check_task_2(my_input):
         dag.test()
         mock_object.assert_called_with("output of first task")
 
+    @conf_vars({("core", "load_examples"): "false"})
+    def test_dag_test_with_trigger_dagrun_operator(self, test_dags_bundle, session):
+        dag_id = "test_dag_test_trigger_parent"
+        target_dag_id = "test_dag_test_trigger_target"
+
+        dagbag = DagBag(dag_folder=os.fspath(TEST_DAGS_FOLDER), include_examples=False)
+        dag = dagbag.dags.get(dag_id)
+        assert dag is not None
+
+        # Ensure target DAG is not serialized before dag.test() runs.
+        assert DBDagBag().get_latest_version_of_dag(target_dag_id, session=session) is None
+
+        dr = dag.test()
+
+        assert dr.state == DagRunState.SUCCESS
+        assert session.scalar(select(DagRun).where(DagRun.dag_id == target_dag_id)) is not None
+
     def test_dag_test_with_fail_handler(self, testing_dag_bundle):
         mock_handle_object_1 = mock.MagicMock()
         mock_handle_object_2 = mock.MagicMock()
diff --git a/task-sdk/src/airflow/sdk/definitions/dag.py b/task-sdk/src/airflow/sdk/definitions/dag.py
index 3df36692513a7..9d1e1a1f45980 100644
--- a/task-sdk/src/airflow/sdk/definitions/dag.py
+++ b/task-sdk/src/airflow/sdk/definitions/dag.py
@@ -1286,9 +1286,6 @@ def test(
             if not version:
                 from airflow.dag_processing.bundles.manager import DagBundlesManager
                 from airflow.dag_processing.dagbag import BundleDagBag, sync_bag_to_db
-                from airflow.sdk.definitions._internal.dag_parsing_context import (
-                    _airflow_parsing_context_manager,
-                )
 
                 manager = DagBundlesManager()
                 manager.sync_bundles_to_db(session=session)
@@ -1298,13 +1295,12 @@ def test(
                 for bundle in manager.get_all_dag_bundles():
                     if not bundle.is_initialized:
                         bundle.initialize()
-                    with _airflow_parsing_context_manager(dag_id=self.dag_id):
-                        dagbag = BundleDagBag(
-                            dag_folder=bundle.path,
-                            bundle_path=bundle.path,
-                            bundle_name=bundle.name,
-                        )
-                        sync_bag_to_db(dagbag, bundle.name, bundle.version)
+                    dagbag = BundleDagBag(
+                        dag_folder=bundle.path,
+                        bundle_path=bundle.path,
+                        bundle_name=bundle.name,
+                    )
+                    sync_bag_to_db(dagbag, bundle.name, bundle.version)
                     version = DagVersion.get_version(self.dag_id)
                     if version:
                         break