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