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import unittest
import PySide2

# This test tests the new "macro" feature of qApp.
# It also uses the qApp variable to finish the instance and start over.

class qAppMacroTest(unittest.TestCase):
    _test_1093_is_first = True

    def test_qApp_is_like_a_macro_and_can_restart(self):
        self._test_1093_is_first = False
        from PySide2 import QtCore
        try:
            from PySide2 import QtGui, QtWidgets
        except ImportError:
            QtWidgets = QtGui = QtCore
        # qApp is in the builtins
        self.assertEqual(bool(qApp), False)
        # and also in certain PySide modules
        QtCore.qApp, QtGui.qApp, QtWidgets.qApp
        # and they are all the same
        self.assertTrue(qApp is QtCore.qApp is QtGui.qApp is QtWidgets.qApp)
        # and the type is NoneType, but it is not None (cannot work)
        self.assertTrue(type(qApp) is type(None))
        self.assertTrue(qApp is not None)
        # now we create an application for all cases
        classes = (QtCore.QCoreApplication,
                   QtGui.QGuiApplication,
                   QtWidgets.QApplication)
        for klass in classes:
            print("created", klass([]))
            del __builtins__.qApp
            print("deleted qApp")
        # creating without deletion raises:
        QtCore.QCoreApplication([])
        with self.assertRaises(RuntimeError):
            QtCore.QCoreApplication([])
        # assigning qApp is obeyed
        QtCore.qApp = 42
        del __builtins__.qApp
        self.assertEqual(QtCore.qApp, 42)
        self.assertNotEqual(__builtins__, 42)
        # delete it and it re-appears
        del QtCore.qApp
        QtCore.QCoreApplication([])
        self.assertEqual(QtCore.QCoreApplication.instance(), QtCore.qApp)
        # and they are again all the same
        self.assertTrue(qApp is QtCore.qApp is QtGui.qApp is QtWidgets.qApp)

    def test_1093(self):
        # Test that without creating a QApplication staticMetaObject still exists.
        # Please see https://bugreports.qt.io/browse/PYSIDE-1093 for explanation.
        # Note: This test must run first, otherwise we would be mislead!
        assert self._test_1093_is_first
        from PySide2 import QtCore
        self.assertTrue(QtCore.QObject.staticMetaObject is not None)
        app = QtCore.QCoreApplication.instance()
        self.assertTrue(QtCore.QObject.staticMetaObject is not None)
        if app is None:
            app = QtCore.QCoreApplication([])
        self.assertTrue(QtCore.QObject.staticMetaObject is not None)
        del __builtins__.qApp


if __name__ == '__main__':
    unittest.main()
