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'''Helper classes and functions'''

import gc
import unittest

from PySide6.QtGui import QGuiApplication


class UsesQGuiApplication(unittest.TestCase):
    '''Helper class to provide QGuiApplication instances'''

    def setUp(self):
        '''Creates the QGuiApplication instance'''

        # Simple way of making instance a singleton
        super(UsesQGuiApplication, self).setUp()
        self.app = QGuiApplication.instance() or QGuiApplication([])

    def tearDown(self):
        '''Deletes the reference owned by self'''
        del self.app
        # PYSIDE-535: Need to collect garbage in PyPy to trigger deletion
        gc.collect()
        super(UsesQGuiApplication, self).tearDown()
