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## Copyright (C) 2016 The Qt Company Ltd.
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## This file is part of the test suite of PySide2.
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from __future__ import print_function
import unittest
import sys
import gc

from PySide2 import QtGui, QtWidgets

try:
    from sys import gettotalrefcount
    skiptest = False
except ImportError:
    skiptest = True

class ConnectTest(unittest.TestCase):

    def callback(self, o):
        print("callback")
        self._called = o

    def testNoLeaks_ConnectAndDisconnect(self):
        self._called = None
        app = QtWidgets.QApplication([])
        o = QtWidgets.QTreeView()
        o.setModel(QtGui.QStandardItemModel())
        o.selectionModel().destroyed.connect(self.callback)
        o.selectionModel().destroyed.disconnect(self.callback)
        gc.collect()
        # if this is no debug build, then we check at least that
        # we do not crash any longer.
        if not skiptest:
            total = sys.gettotalrefcount()
        for idx in range(1000):
            o.selectionModel().destroyed.connect(self.callback)
            o.selectionModel().destroyed.disconnect(self.callback)
        gc.collect()
        if not skiptest:
            self.assertTrue(abs(gettotalrefcount() - total) < 10)


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