code: func (stub *MockStub) MockInvokeWithSignedProposal(uuid string, args [][]byte, sp *pb.SignedProposal) pb.Response {
  	stub.args = args
  	stub.MockTransactionStart(uuid)
  	stub.signedProposal = sp
  	res := stub.cc.Invoke(stub)
  	stub.MockTransactionEnd(uuid)
  	return res
  }
docs: // Invoke this chaincode, also starts and ends a transaction.