summaryrefslogtreecommitdiffstats
path: root/tests/samplebinding/class_fields_test.py
blob: c01a6bf07103aa18a21b29a24021a49b5b9bdf3a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# This file is part of the Shiboken Python Bindings Generator project.
#
# Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
#
# Contact: PySide team <contact@pyside.org>
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public License
# version 2.1 as published by the Free Software Foundation. Please
# review the following information to ensure the GNU Lesser General
# Public License version 2.1 requirements will be met:
# http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
# #
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
# 02110-1301 USA

'''Simple test case for accessing the exposed C++ class fields.'''

from sys import getrefcount
import unittest

from sample import Derived, Point, ObjectType

class TestAccessingCppFields(unittest.TestCase):
    '''Simple test case for accessing the exposed C++ class fields.'''

    def testAccessingPrimitiveTypeField(self):
        '''Reads and writes a primitive type (in this case an 'int') field.'''
        d = Derived()
        self.assertEqual(type(d.primitiveField), int)

        # attribution
        old_value = d.primitiveField
        new_value = 2255
        d.primitiveField = new_value
        self.assertEqual(d.primitiveField, new_value)
        self.assertNotEqual(d.primitiveField, old_value)

        # attribution with a convertible type
        value = 1.2
        d.primitiveField = value
        self.assertEqual(d.primitiveField, int(value))

        # attribution with invalid type
        self.assertRaises(TypeError, lambda : setattr(d, 'primitiveField', None))

    def testAccessingValueTypeField(self):
        '''Reads and writes a value type (in this case a 'Point') field.'''
        d = Derived()
        self.assertEqual(type(d.valueTypeField), Point)

        # attribution
        old_value = d.valueTypeField
        new_value = Point(-10, 537)
        d.valueTypeField = new_value
        self.assertEqual(d.valueTypeField, new_value)

        #object modify
        d.valueTypeField.setX(10)
        d.valueTypeField.setY(20)
        self.assertEqual(d.valueTypeField.x(), 10)
        self.assertEqual(d.valueTypeField.y(), 20)



        # attribution with invalid type
        self.assertRaises(TypeError, lambda : setattr(d, 'valueTypeField', 123))

    def testAccessingObjectTypeField(self):
        '''Reads and writes a object type (in this case an 'ObjectType') field.'''
        d = Derived()

        # attribution
        old_value = d.objectTypeField
        new_value = ObjectType()
        d.objectTypeField = new_value
        self.assertEqual(d.objectTypeField, new_value)
        self.assertNotEqual(d.objectTypeField, old_value)

        # attribution with a convertible type
        value = None
        d.objectTypeField = value
        self.assertEqual(d.objectTypeField, value)

        # attribution with invalid type
        self.assertRaises(TypeError, lambda : setattr(d, 'objectTypeField', 123))

    def testRefCountingAccessingObjectTypeField(self):
        '''Accessing a object type field should respect the reference counting rules.'''
        d = Derived()

        # attributing object to instance's field should increase its reference count
        o1 = ObjectType()
        refcount1 = getrefcount(o1)
        d.objectTypeField = o1
        self.assertEqual(d.objectTypeField, o1)
        self.assertEqual(getrefcount(d.objectTypeField), refcount1 + 1)

        # attributing a new object to instance's field should decrease the previous object's reference count
        o2 = ObjectType()
        refcount2 = getrefcount(o2)
        d.objectTypeField = o2
        self.assertEqual(d.objectTypeField, o2)
        self.assertEqual(getrefcount(o1), refcount1)
        self.assertEqual(getrefcount(d.objectTypeField), refcount2 + 1)

    def testRefCountingOfReferredObjectAfterDeletingReferrer(self):
        '''Deleting the object referring to other object should decrease the reference count of the referee.'''
        d = Derived()
        o = ObjectType()
        refcount = getrefcount(o)
        d.objectTypeField = o
        self.assertEqual(getrefcount(o), refcount + 1)
        del d
        self.assertEqual(getrefcount(o), refcount)

    def testStaticField(self):
        self.assertEqual(Derived.staticPrimitiveField, 0)

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