How to Create Unit Test for QTcpServer and Mocking QUdpSocket?

[DJViking]

I want to create unit tests on some business logic, not any GUI UI code.

I have a class that extends QTcpServer, which uses a QUdpSocket to send messages to another server. What I need to test is the message the server sends to the other server is correct.

How can I create a Mock of this QUdpSocket? I am using Google Test as my testing framework.

my_tcp_server.h

class MyTcpServer : public QTcpServer
{
  Q_OBJECT
public:
  explicit MycpServer(QObject *parent = 0);
  ~MyTcpServer();

private:
    qint64  sendMessage(QSslSocket *sslSocket, const char *buff);
    QUdpSocket socket;
};

my_tcp_server.cpp

MyTcpServer::MyTcpServer(QObject *parent) 
    : QTcpServer(parent)
{
    socket.bind();
}

qint64 MyTcpServer::sendMessage(QSslSocket *sslSocket, const char *buff)
{
    qint64 returnValue = 0;

    MessageStruct message;
    message.value1 =*((unsigned int*) buff); buff+=4;
    message.value2 =*((unsigned int*) buff); buff+=4;
    message.value3 =*((unsigned int*) buff); buff;

    qint64 returnValue = socket.writeDatagram((const char *) &message, sizeof(MessageStruct), QHostAddress(HOST), PORT);
}

The message is constructed of the content in the byte buffer coming from the client connected to the QTcpServer.

What I need to test is that this message is correct, but I do not want to send this message to any socket.

[SGaist]

Hi,

The usual way would be to make QUdpSocket a pointer and add a setter to your class so you can change the QUdpSocket for something else.