testMessage.retainPayload();
            assertTrue(testMessage.isRetainPayload());
        }

        @Test
        @DisplayName("Should get and set raw payload")
        void testRawPayload() {
            assertNull(testMessage.getRawPayload());
            byte[] payload = new byte[] { 1, 2, 3, 4, 5 };
            testMessage.setRawPayload(payload);