testMessage.setReadSize(1024);
            // No getter for readSize, but it's used internally in decode
        }

        @Test
        @DisplayName("Should check if async")
        void testAsyncProperty() {
            assertFalse(testMessage.isAsync());
        }
    }

    @Nested
    @DisplayName("Flag Operations Tests")
    class FlagOperationsTests {

        @Test