Problem with a QTcpServer and a UnitTest

[dualfaces]

Hello all,

i have call MyServer that listens on a specific TCP port for incoming connections and sends some data when a connection has been established.
Therefore i made some unit tests (to get used to the qt test library). MyServer belongs to a library, which is a Qt library project. Then I have a project Tests that uses the subdirs template. Inside the MyServer subproject as Unit test.

The tests for connection establishment work fine, then I want to check if the server sends the data as it is supposed to do. My primal version of the test looks like this:
@
MyServer srv(nullptr);
QTcpSocket tcp;
tcp.connectToHost("127.0.0.1", 9997);
tcp.waitForConnected(3000);
QVERIFY(tcp.state() == QAbstractSocket::ConnectedState);
QVERIFY(tcp.bytesAvailable() > 0);
@

The second verify always fails. However, if I build an own console application performing the same operations the data arrives.
What is the problem?

Thank you!

Regards

[SGaist]

Hi,

You don't let any time for the data to arrive.

@
tcp.waitForConnected(3000);
QVERIFY(tcp.state() == QAbstractSocket::ConnectedState);
QVERIFY(tcp.bytesAvailable() > 0);
@

These three will be called one after the other without any pause. You should wait some milliseconds using qWait to let the event loop run

[dualfaces]

Thanks for the fast response, i already thought something like this and tried QThread::msleep()... but this couldn't work since it also blocks execution of the event loop I suppose.

Unfortunately this now leads to an error. The data are sent by the server in the slot for the signal newConnection, but sending can also be triggered manually.
@
tcp.connectToHost("127.0.0.1", 9997);
tcp.waitForConnected(3000);
QVERIFY(tcp.state() == QAbstractSocket::ConnectedState);
QTest::qWait(1000);
srv.sendData();
QTest::qWait(1000);
QVERIFY(tcp.bytesAvailable() > 0);
@

The error is:
QFATAL : MyServerTest::retrieveInitialDataAfterConnection() ASSERT: "QCoreApplication::instance()" in file C:\Qt\5.2.0\mingw48_32\include/QtTest/qtestsystem.h, line 61

sendData contains some output via std:cerr, hence it is written in the test output when executed. When i comment the first occurence of qWait the output occurs, when using the two qWait the output is not present and the above error occurs twice in a row. and the last verify is not evaluated. Is the test still wrong?

At the bottom my test looks like this:
@
QTEST_APPLESS_MAIN(MyServerTest)

#include "tst_myservertest.moc"
@

[SGaist]

You don't have an application, change QTEST_APPLESS_MAIN to QTEST_MAIN