Shinsuke Sugaya <******@****.***> 1755149504 +0900

        }
    }

    @Nested
    @DisplayName("Legacy Method Tests")
    class LegacyMethodTests {

        @Test
        @DisplayName("Should ignore extended security setting")
        void testSetExtendedSecurity() {
            testMessage.setExtendedSecurity(true);
            testMessage.setExtendedSecurity(false);
            // Method is empty, just ensure no exception
        }

        @Test