Qt 5.4.1 QTestLib colorizing results in console output not working (red green unit testing)

I would like to have the results of QTestLib in the console colorized (PASS: green, FAIL: red) in order to see the results faster (Increasing QTestLib productivity). I am using Qt 5.4.1 MSVC2010 x64. I set the environmental variable QTEST_COLORED to 1. However, the console output from the QTestLib gets not colorized. When I am using Qt 4.8.6 x64 then the console output gets colorized as expected (PASS: green, FAIL: red).

Does anybody know how I can achieve the same result in Qt 5.4.1?