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