If you enable Qt Creator's AutoTest plugin, you will be able to enjoy a better output for your passing (and failing) tests.
To enable the plugin, click on the About Plugins... menu item, search for AutoTest, and tick the corresponding checkbox:
Then, click on the Split icon in the Projects pane and select the Tests menu entry:
The Tests pane will appear underneath Projects, showing available test cases grouped by test framework. If you expand the QtTest node, you can check out our implemented test case and test: