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'''Helper classes and functions'''

import unittest

from PySide2.QtCore import QCoreApplication

_core_instance = None


class UsesQCoreApplication(unittest.TestCase):
    '''Helper class for test cases that require an QCoreApplication
    Just connect or call self.exit_app_cb. When called, will ask
    self.app to exit.
    '''

    def setUp(self):
        '''Set up resources'''

        global _core_instance
        if _core_instance is None:
            _core_instance = QCoreApplication([])

        self.app = _core_instance

    def tearDown(self):
        '''Release resources'''
        del self.app

    def exit_app_cb(self):
        '''Quits the application'''
        self.app.exit(0)