assertTrue(length > 0);
        assertNotNull(testBlock.getRawPayload());
    }

    @Test
    @DisplayName("Test decode with signature verification failure")
    void testDecodeWithSignatureVerificationFailure() {
        testBlock = new TestAndXServerMessageBlock(mockConfig, (byte) 0x25) {
            @Override
            public boolean verifySignature(byte[] data, int offset, int length) {