"toString() should return the correct UUID string in uppercase for lowercase input");
        }

        @Test
        @DisplayName("toString() should handle zero UUID correctly")
        void testToStringZeroUuid() {
            // Arrange
            rpc.uuid_t rpcUuid = new rpc.uuid_t();
            rpcUuid.time_low = 0;
            rpcUuid.time_mid = 0;
            rpcUuid.time_hi_and_version = 0;