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#!/usr/bin/env python
import unittest
from sys import getrefcount
from helper import UsesQApplication
from PySide.QtCore import *
from PySide.QtGui import QTableView
class TestModel(QAbstractTableModel):
def __init__(self, parent=None):
QAbstractTableModel.__init__(self, parent)
def rowCount(self, parent):
return 0
def columnCount(self, parent):
return 0
def data(self, index, role):
return None
class KeepReferenceTest(UsesQApplication):
def testModelWithoutParent(self):
view = QTableView()
model = TestModel()
view.setModel(model)
samemodel = view.model()
self.assertEqual(model, samemodel)
def testModelWithParent(self):
view = QTableView()
model = TestModel(None)
view.setModel(model)
samemodel = view.model()
self.assertEqual(model, samemodel)
def testReferenceCounting(self):
'''Tests reference count of model object referred by view objects.'''
model1 = TestModel()
refcount1 = getrefcount(model1)
view1 = QTableView()
view1.setModel(model1)
self.assertEqual(getrefcount(view1.model()), refcount1 + 1)
view2 = QTableView()
view2.setModel(model1)
self.assertEqual(getrefcount(view2.model()), refcount1 + 2)
model2 = TestModel()
view2.setModel(model2)
self.assertEqual(getrefcount(view1.model()), refcount1 + 1)
def testReferenceCountingWhenDeletingReferrer(self):
'''Tests reference count of model object referred by deceased view object.'''
model = TestModel()
refcount1 = getrefcount(model)
view = QTableView()
view.setModel(model)
self.assertEqual(getrefcount(view.model()), refcount1 + 1)
del view
self.assertEqual(getrefcount(model), refcount1)
def testReferreedObjectSurvivalAfterContextEnd(self):
'''Model object assigned to a view object must survive after getting out of context.'''
def createModelAndSetToView(view):
model = TestModel()
model.setObjectName('created model')
view.setModel(model)
view = QTableView()
createModelAndSetToView(view)
model = view.model()
if __name__ == '__main__':
unittest.main()
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