chore(sql_lab): Added Unit Test for stop query exception

tests/integration_tests/core_tests.py

@@ -1548,6 +1548,28 @@ def test_dashboard_injected_exceptions(self, mock_db_connection_mutator):
         data = self.get_resp(url)
         self.assertIn("Error message", data)
 
+    @mock.patch("superset.sql_lab.cancel_query")
+    @mock.patch("superset.views.core.db.session")
+    def test_stop_query_not_implemented(
+        self, mock_superset_db_session, mock_sql_lab_cancel_query
+    ):
+        """
+        Handles stop query when the DB engine spec does not
+        have a cancel query method.
+        """
+        form_data = {"client_id": "foo"}
+        query_mock = mock.Mock()
+        query_mock.client_id = "foo"
+        query_mock.status = QueryStatus.RUNNING
+        self.login(username="admin")
+        mock_superset_db_session.query().filter_by().one().return_value = query_mock
+        mock_sql_lab_cancel_query.return_value = False
+        rv = self.client.post(
+            "/superset/stop_query/", data={"form_data": json.dumps(form_data)},
+        )
+
+        assert rv.status_code == 422
+
 
 if __name__ == "__main__":
     unittest.main()