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##
## Copyright (C) 2016 The Qt Company Ltd.
## Contact: https://www.qt.io/licensing/
##
## This file is part of the test suite of Qt for Python.
##
## $QT_BEGIN_LICENSE:GPL-EXCEPT$
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## GNU General Public License Usage
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## General Public License version 3 as published by the Free Software
## Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
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from PySide2.QtCore import *
from PySide2.QtWidgets import *

class Mixin1(object):
    pass

class Mixin2(object):
    pass

class Mixin3(object):
    pass

class MainWindow(Mixin1, Mixin2, Mixin3, QFrame):
    def __init__(self):
        super(MainWindow, self).__init__()

def main():
    app = QApplication([])
    # if it doesn't crash it should pass
    w = MainWindow()
    w.show()
    QTimer.singleShot(0, w.close)
    app.exec_()

if __name__ == "__main__":
    main()