public String generateInvalidPayloadExceptionMessage(final byte[] hl7Bytes) {
        if (hl7Bytes == null) {
            return "HL7 payload is null";
        }

        return generateInvalidPayloadExceptionMessage(hl7Bytes, hl7Bytes.length);
    }
@Test
    public void testGenerateInvalidPayloadExceptionMessage() {
        String message = hl7util.generateInvalidPayloadExceptionMessage(TEST_MESSAGE.getBytes());

        assertNull(message, "Valid payload should result in a null message");
    }