### Question:
OMAllocateBlockRequest extends OMKeyRequest { @Override public OMRequest preExecute(OzoneManager ozoneManager) throws IOException { AllocateBlockRequest allocateBlockRequest = getOmRequest().getAllocateBlockRequest(); Preconditions.checkNotNull(allocateBlockRequest); KeyArgs keyArgs = allocateBlockRequest.getKeyArgs(); ExcludeList excludeList = new ExcludeList(); if (allocateBlockRequest.hasExcludeList()) { excludeList = ExcludeList.getFromProtoBuf(allocateBlockRequest.getExcludeList()); } List<OmKeyLocationInfo> omKeyLocationInfoList = allocateBlock(ozoneManager.getScmClient(), ozoneManager.getBlockTokenSecretManager(), keyArgs.getType(), keyArgs.getFactor(), excludeList, ozoneManager.getScmBlockSize(), ozoneManager.getScmBlockSize(), ozoneManager.getPreallocateBlocksMax(), ozoneManager.isGrpcBlockTokenEnabled(), ozoneManager.getOMNodeId()); KeyArgs.Builder newKeyArgs = keyArgs.toBuilder() .setModificationTime(Time.now()) .setKeyName(validateAndNormalizeKey( ozoneManager.getEnableFileSystemPaths(), keyArgs.getKeyName())); AllocateBlockRequest.Builder newAllocatedBlockRequest = AllocateBlockRequest.newBuilder() .setClientID(allocateBlockRequest.getClientID()) .setKeyArgs(newKeyArgs); if (allocateBlockRequest.hasExcludeList()) { newAllocatedBlockRequest.setExcludeList( allocateBlockRequest.getExcludeList()); } newAllocatedBlockRequest.setKeyLocation( omKeyLocationInfoList.get(0).getProtobuf()); return getOmRequest().toBuilder().setUserInfo(getUserInfo()) .setAllocateBlockRequest(newAllocatedBlockRequest).build(); } OMAllocateBlockRequest(OMRequest omRequest); @Override OMRequest preExecute(OzoneManager ozoneManager); @Override OMClientResponse validateAndUpdateCache(OzoneManager ozoneManager,
      long trxnLogIndex, OzoneManagerDoubleBufferHelper omDoubleBufferHelper);  }### Answer:
@Test public void testPreExecute() throws Exception { doPreExecute(createAllocateBlockRequest()); }