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path: root/sources/shiboken2/tests/samplebinding/reference_test.py
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#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
#############################################################################
##
## Copyright (C) 2016 The Qt Company Ltd.
## Contact: https://www.qt.io/licensing/
##
## This file is part of the test suite of Qt for Python.
##
## $QT_BEGIN_LICENSE:GPL-EXCEPT$
## Commercial License Usage
## Licensees holding valid commercial Qt licenses may use this file in
## accordance with the commercial license agreement provided with the
## Software or, alternatively, in accordance with the terms contained in
## a written agreement between you and The Qt Company. For licensing terms
## and conditions see https://www.qt.io/terms-conditions. For further
## information use the contact form at https://www.qt.io/contact-us.
##
## GNU General Public License Usage
## Alternatively, this file may be used under the terms of the GNU
## General Public License version 3 as published by the Free Software
## Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
## included in the packaging of this file. Please review the following
## information to ensure the GNU General Public License requirements will
## be met: https://www.gnu.org/licenses/gpl-3.0.html.
##
## $QT_END_LICENSE$
##
#############################################################################

'''Test cases for methods that receive references to objects.'''

import sys
import unittest

from sample import *

class ExtendedReference(Reference):
    def __init__(self):
        Reference.__init__(self)
        self.uses_reference_virtual_called = False
        self.uses_const_reference_virtual_called = False
        self.reference_inc = 1
        self.const_reference_inc = 2
        self.multiplier = 333

    def usesReferenceVirtual(self, ref, inc):
        self.uses_reference_virtual_called = True
        return ref.objId() + inc + self.reference_inc

    def usesConstReferenceVirtual(self, ref, inc):
        self.uses_const_reference_virtual_called = True
        return ref.objId() + inc + self.const_reference_inc

    def alterReferenceIdVirtual(self, ref):
        ref.setObjId(ref.objId() * self.multiplier)


class ReferenceTest(unittest.TestCase):
    '''Test case for methods that receive references to objects.'''

    def testMethodThatReceivesReference(self):
        '''Test a method that receives a reference to an object as argument.'''
        objId = 123
        r = Reference(objId)
        self.assertEqual(Reference.usesReference(r), objId)

    def testCantSegFaultWhenReceiveNone(self):
        '''do not segfault when receiving None as argument.'''
        s = Str()
        self.assertTrue(None == s)

    def testMethodThatReceivesConstReference(self):
        '''Test a method that receives a const reference to an object as argument.'''
        objId = 123
        r = Reference(objId)
        self.assertEqual(Reference.usesConstReference(r), objId)

    def testModificationOfReference(self):
        '''Tests if the identity of a reference argument is preserved when passing it to be altered in C++.'''
        objId = 123
        r1 = Reference(objId)
        r1.alterReferenceIdVirtual(r1)
        self.assertEqual(r1.objId(), objId * Reference.multiplier())

    def testModificationOfReferenceCallingAVirtualIndirectly(self):
        '''Tests if the identity of a reference argument is preserved when passing it to be altered in C++ through a method that calls a virtual method.'''
        objId = 123
        r1 = Reference(objId)
        r1.callAlterReferenceIdVirtual(r1)
        self.assertEqual(r1.objId(), objId * Reference.multiplier())

    def testModificationOfReferenceCallingAReimplementedVirtualIndirectly(self):
        '''Test if a Python override of a virtual method with a reference parameter called from C++ alters the argument properly.'''
        objId = 123
        r = Reference(objId)
        er = ExtendedReference()
        result = er.callAlterReferenceIdVirtual(r)
        self.assertEqual(r.objId(), objId * er.multiplier)

    def testReimplementedVirtualMethodCallWithReferenceParameter(self):
        '''Test if a Python override of a virtual method with a reference parameter is correctly called from C++.'''
        inc = 9
        objId = 123
        r = Reference(objId)
        er = ExtendedReference()
        result = er.callUsesReferenceVirtual(r, inc)
        self.assertEqual(result, objId + inc + er.reference_inc)

    def testReimplementedVirtualMethodCallWithConstReferenceParameter(self):
        '''Test if a Python override of a virtual method with a const reference parameter is correctly called from C++.'''
        inc = 9
        objId = 123
        r = Reference(objId)
        er = ExtendedReference()
        result = er.callUsesConstReferenceVirtual(r, inc)
        self.assertEqual(result, objId + inc + er.const_reference_inc)

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