How to use the spyder.utils.qthelpers.qapplication function in spyder

def test():
    from spyder.utils.qthelpers import qapplication
    app = qapplication()
    table = ShortcutsTable()
    table.show()
    app.exec_()

    table.check_shortcuts()

def test():
    """Text editor demo"""
    from spyder.utils.qthelpers import qapplication
    _app = qapplication()  # analysis:ignore

    text = """01234567890123456789012345678901234567890123456789012345678901234567890123456789
dedekdh elkd ezd ekjd lekdj elkdfjelfjk e"""
    dialog = TextEditor(text)
    dialog.exec_()

    dlg_text = dialog.get_value()
    assert text == dlg_text

def test():
    """Run breakpoint widget test"""
    from spyder.utils.qthelpers import qapplication
    app = qapplication()
    widget = BreakpointWidget(None)
    widget.show()
    sys.exit(app.exec_())

def test():
    """Run widget test"""
    from spyder.utils.qthelpers import qapplication
    app = qapplication()
    widget = LineProfilerWidget(None)
    widget.resize(800, 600)
    widget.show()
    widget.analyze(osp.normpath(osp.join(osp.dirname(__file__), os.pardir,
                                         'tests/profiling_test_script.py')),
                   use_colors=True)
    sys.exit(app.exec_())

def test():
    from spyder.utils.qthelpers import qapplication
    app = qapplication()
    test = ProjectExplorerTest()
    test.resize(250, 480)
    test.show()
    app.exec_()

def test():
    """Text editor demo"""
    from spyder.utils.qthelpers import qapplication
    _app = qapplication()  # analysis:ignore

    text = """01234567890123456789012345678901234567890123456789012345678901234567890123456789
dedekdh elkd ezd ekjd lekdj elkdfjelfjk e"""
    dialog = TextEditor(text)
    dialog.exec_()

    dlg_text = dialog.get_value()
    assert text == dlg_text

def editor_test():
    """Test Collections editor."""
    from spyder.utils.qthelpers import qapplication

    app = qapplication()             #analysis:ignore
    dialog = CollectionsEditor()
    dialog.setup(get_test_data())
    dialog.show()
    app.exec_()

def test():  # pragma: no cover
    """Display recovery dialog for manual testing."""
    import shutil
    import tempfile
    from spyder.utils.qthelpers import qapplication

    app = qapplication()
    tempdir = tempfile.mkdtemp()
    unused, unused, autosave_mapping = make_temporary_files(tempdir)
    dialog = RecoveryDialog(autosave_mapping)
    dialog.exec_()
    print('files_to_open =', dialog.files_to_open)  # spyder: test-skip
    shutil.rmtree(tempdir)

def initialize():
    """Initialize Qt, patching sys.exit and eventually setting up ETS"""
    # This doesn't create our QApplication, just holds a reference to
    # MAIN_APP, created above to show our splash screen as early as
    # possible
    app = qapplication()

    # --- Set application icon
    app.setWindowIcon(APP_ICON)

    #----Monkey patching QApplication
    class FakeQApplication(QApplication):
        """Spyder's fake QApplication"""
        def __init__(self, args):
            self = app  # analysis:ignore
        @staticmethod
        def exec_():
            """Do nothing because the Qt mainloop is already running"""
            pass
    from qtpy import QtWidgets
    QtWidgets.QApplication = FakeQApplication

def main():
    """Run Windows environment variable editor"""
    from spyder.utils.qthelpers import qapplication
    app = qapplication()
    if os.name == 'nt':
        dialog = WinUserEnvDialog()
    else:
        dialog = EnvDialog()
    dialog.show()
    app.exec_()