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

sys.path.append(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
from init_paths import init_test_paths
init_test_paths(False)

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 = gettotalrefcount()
        for idx in range(1000):
            o.selectionModel().destroyed.connect(self.callback)
            o.selectionModel().destroyed.disconnect(self.callback)
        gc.collect()
        if not skiptest:
            delta = gettotalrefcount() - total
            print("delta total refcount =", delta)
            self.assertTrue(abs(delta) < 10)


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