### Question:
OxmPbbIsidSerializer extends AbstractOxmMatchEntrySerializer { @Override protected int getOxmFieldCode() { return OxmMatchConstants.PBB_ISID; }  @Override void serialize(MatchEntry entry, ByteBuf outBuffer);  }### Answer:
@Test public void getOxmFieldCode() { assertEquals("Wrong oxm-class", OxmMatchConstants.PBB_ISID, serializer.getOxmFieldCode()); }