def testThreadSafetyWithIndex(self):
        layer = QgsVectorLayer('Point?crs=epsg:4326&index=yes&field=pk:integer&field=cnt:int8&field=name:string(0)&field=name2:string(0)&field=num_char:string&key=pk',
                               'test', 'pythonprovider')

        provider = layer.dataProvider()
        f = QgsFeature()
        f.setAttributes([5, -200, NULL, 'NuLl', '5'])
        f.setGeometry(QgsGeometry.fromWkt('Point (-71.123 78.23)'))

        for i in range(100000):
            provider.addFeatures([f])

        # filter rect request
        extent = QgsRectangle(-73, 70, -63, 80)
        request = QgsFeatureRequest().setFilterRect(extent)
        self.assertTrue(QgsTestUtils.testProviderIteratorThreadSafety(self.source, request))