From 0d6cf144768c4e9b44da8a8d16f954aceb92f64d Mon Sep 17 00:00:00 2001
From: Yufeng He <40085740+he-yufeng@users.noreply.github.com>
Date: Thu, 21 May 2026 00:05:32 +0800
Subject: [PATCH] test: cover web reload agent observer setup

---
 tests/unittests/cli/test_fast_api.py | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/tests/unittests/cli/test_fast_api.py b/tests/unittests/cli/test_fast_api.py
index 9731e3efd5..11ad60c86e 100755
--- a/tests/unittests/cli/test_fast_api.py
+++ b/tests/unittests/cli/test_fast_api.py
@@ -540,6 +540,31 @@ def _create_test_client(
     return TestClient(app)
 
 
+def test_web_reload_agents_uses_module_api_server_import(
+    mock_session_service,
+    mock_artifact_service,
+    mock_memory_service,
+    mock_agent_loader,
+    mock_eval_sets_manager,
+    mock_eval_set_results_manager,
+):
+  """Regression test for web reload mode with DevServer available."""
+  with patch("google.adk.cli.api_server.Observer") as mock_observer_class:
+    _create_test_client(
+        mock_session_service,
+        mock_artifact_service,
+        mock_memory_service,
+        mock_agent_loader,
+        mock_eval_sets_manager,
+        mock_eval_set_results_manager,
+        reload_agents=True,
+    )
+
+  observer = mock_observer_class.return_value
+  observer.schedule.assert_called_once()
+  observer.start.assert_called_once()
+
+
 def test_agent_with_bigquery_analytics_plugin(
     tmp_path,
     mock_session_service,