code: func (t *MockTransactor) SendTransactionProposal(proposal *fab.TransactionProposal, targets []fab.ProposalProcessor) ([]*fab.TransactionProposalResponse, error) {
  	response := make([]*fab.TransactionProposalResponse, 1)
  	response[0] = &fab.TransactionProposalResponse{Endorser: "example.com", Status: 200,
  		ProposalResponse: &pb.ProposalResponse{Response: &pb.Response{Message: "success", Payload: []byte("abc"), Status: http.StatusOK},
  			Endorsement: &pb.Endorsement{Endorser: []byte("example.com"), Signature: []byte("signature")}},
  	}
  	return response, nil
  }
docs: // SendTransactionProposal sends a TransactionProposal to the target peers.