}

            @Override
            public void setRawPayload(byte[] rawPayload) {
                this.rawPayload = rawPayload;
            }
        };
    }

    @Test
    void testRetainPayload() {
        // Initially, retainPayload should be false
        assertFalse(message.isRetainPayload(), "isRetainPayload should be false initially");

        // Call retainPayload and check if it becomes true