fix: Use mock for app context test to avoid CI issues

Mock has_app_context instead of relying on actual context teardown
which behaves differently in CI environment.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: dpgaspar

tests/test_security_signals.py

@@ -716,31 +716,23 @@ def failing_post_handler(sender, event):
             user_created.disconnect(failing_post_handler)
 
 
-class NoAppContextTestCase(unittest.TestCase):
+class NoAppContextTestCase(SecuritySignalsTestCase):
     """Test signal behavior outside app context."""
 
     def test_signals_disabled_without_app_context(self):
         """Test that _signals_enabled returns False outside app context."""
-        from flask import Flask
-        from flask_appbuilder import AppBuilder
-        from flask_appbuilder.utils.legacy import get_sqla_class
-
-        app = Flask(__name__)
-        app.config.from_object("tests.config_api")
-        app.config["FAB_SECURITY_SIGNALS_ENABLED"] = True
-
-        # Create the app within context
-        with app.app_context():
-            SQLA = get_sqla_class()
-            db = SQLA(app)
-            appbuilder = AppBuilder(app, db.session)
-            sm = appbuilder.sm
-
-            # Within context, signals should be enabled
-            self.assertTrue(sm._signals_enabled())
-
-        # Outside context, signals should be disabled
-        self.assertFalse(sm._signals_enabled())
+        from unittest.mock import patch
+
+        sm = self.appbuilder.sm
+
+        # Within context, signals should be enabled
+        self.assertTrue(sm._signals_enabled())
+
+        # Mock has_app_context to return False
+        with patch(
+            "flask_appbuilder.security.sqla.manager.has_app_context", return_value=False
+        ):
+            self.assertFalse(sm._signals_enabled())
 
 
 class TriggeredByUserTestCase(SecuritySignalsTestCase):