testMessage.setSessionId(maxSessionId);
            assertEquals(maxSessionId, testMessage.getSessionId());
        }

        @Test
        @DisplayName("Should handle all flags set")
        void testAllFlagsSet() {
            int allFlags = 0xFFFFFFFF;
            testMessage.addFlags(allFlags);
            assertEquals(allFlags, testMessage.getFlags());

            // Should still be able to clear specific flags