#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
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## Copyright (C) 2016 The Qt Company Ltd.
## Contact: https://www.qt.io/licensing/
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## This file is part of the test suite of Qt for Python.
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## GNU General Public License Usage
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'''Tests for destroying the parent'''

import sys
import unittest

from sample import ObjectType


class DeleteParentTest(unittest.TestCase):
    '''Test case for deleting a parent object'''

    def testParentDestructor(self):
        '''Delete parent object should invalidate child'''
        parent = ObjectType()
        child = ObjectType()
        child.setParent(parent)

        refcount_before = sys.getrefcount(child)

        del parent
        self.assertRaises(RuntimeError, child.objectName)
        self.assertEqual(sys.getrefcount(child), refcount_before-1)

    def testParentDestructorMultipleChildren(self):
        '''Delete parent object should invalidate all children'''
        parent = ObjectType()
        children = [ObjectType() for _ in range(10)]

        for child in children:
            child.setParent(parent)

        del parent
        for i, child in enumerate(children):
            self.assertRaises(RuntimeError, child.objectName)
            self.assertEqual(sys.getrefcount(child), 4)

    def testRecursiveParentDelete(self):
        '''Delete parent should invalidate grandchildren'''
        parent = ObjectType()
        child = ObjectType(parent)
        grandchild = ObjectType(child)

        del parent
        self.assertRaises(RuntimeError, child.objectName)
        self.assertEqual(sys.getrefcount(child), 2)
        self.assertRaises(RuntimeError, grandchild.objectName)
        self.assertEqual(sys.getrefcount(grandchild), 2)


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