headPos = dbusBuf.getHead();
tailPos = dbusBuf.getTail();
headGenId = parser.bufferGenId(headPos);
headIndexId = parser.bufferIndex(headPos);
headOffset = parser.bufferOffset(headPos);
tailGenId = parser.bufferGenId(tailPos);
tailIndexId = parser.bufferIndex(tailPos);
tailOffset = parser.bufferOffset(tailPos);
assertEquals("Head GenId", 0, headGenId);
assertEquals("Head Index", 1, headIndexId);
assertEquals("Head Offset", 222, headOffset);