QWebView with two instances of QApplication

[Santosh Reddy]

QApplication (QCoreApplication) is a singleton design, it is not intended to be created multiple times in an application. As a matter of fact even if you create multiple instance, user code will access a different instance (may be the second instance) and the Qt library code will still be using the first instance and if you deleted the first instance or has gone out of scope your system will be UNSTABLE.

You have to consider to change the test approach and base all you testing with one QApplication instance.

Even if some one were to find the reason behind the behavior (the obvious reason is that Qt lib internally uses the first instance), you will still have to live with single QApplication instance.

It would also help to know, if someone can try this on Mac or Unix, if this happens on another platfom/compiler combination.

I think it is clear that platform will not play any role in this, it is just that Qt is designed that way.

[khilin]

Santosh, thank you very much for your answer.

After we read your answer we are already working to change the test approach to use only one instance of QApplication. We have a question about it, is there any way to reset the state of the instance of QApplication, we want to be sure that the execution of one test does not affect the execution of the rest of the tests.

Again, thank you for your time.

Daniel

[Santosh Reddy]

We have a question about it, is there any way to reset the state of the instance of QApplication,

As such there is no direct way (API) to reset the QApplication. What you could do is individually reset the properties which are of your interest.

we want to be sure that the execution of one test does not affect the execution of the rest of the tests.

IMO, when it come to unit tests, each test is supposed to set up it's required settings with in the test itself, so the test case should pass what ever be the condition of QApplication, so I don't see any need to resetting QApplication state

[wysota]

What exactly would you want to reset in the application object? If you are not modifying the object yourself then there is nothing to reset. Webviews will not contaminate the application object in any way.

[anda_skoa]

I would suggest to look into Qt's unit test framework QTestLib.

It is trivial to use and you'll get a separate executable for all things you want to have separate.

Cheers,
_