def test__getDoubleAttr(self):
"""check Attributes._getDoubleAttr()
"""
pdfc = PDFCalculator()
pdfc.foo = 11
self.assertRaises(AttributeError, pdfc._getDoubleAttr, 'foo')
pdfc._registerDoubleAttribute('foo')
self.assertEqual(11, pdfc._getDoubleAttr('foo'))
pdfc.rmax = 22
self.assertEqual(22, pdfc._getDoubleAttr('rmax'))
setattr(pdfc, 'rmax', 23)
self.assertEqual(23, pdfc._getDoubleAttr('rmax'))
self.assertRaises(Exception, setattr, pdfc, 'rmax', 'xxx')
return
