def test_unbound_descriptor(self):
factor = 4
class Bar(object):
def __init__(self, v):
self._v = v
def expression(self):
return f'= {factor} * value'
def value(self):
return self._v
def set_value(self, v):
self._v = v
b = Bar(3)
p1 = ParamNode(type=int,
validator=Interval(0, 5),
fget=Bar.value,
fset=Bar.set_value)
self.assertEqual(p1.name(), Bar.value.__name__)
self.assertEqual(b.value(), p1.value(obj=b))
b.set_value(4)
self.assertEqual(b.value(), p1.value(obj=b))
p1.set_value(5, obj=b)
self.assertEqual(b.value(), p1.value(obj=b))
with self.assertRaises(ValueError):
p1.set_value(6, obj=b)
# unfortunately, it is still possible to assign
# an invalid value to the data object directly
b.set_value(6)
# but a ValueError will be thrown when we try
# to access the invalid value
with self.assertRaises(ValueError):
p1.value(obj=b)
# replace invalid value set above
b.set_value(5)
p2 = ParamNode(type=int, fget=Bar.expression)
self.assertTrue(p2.is_unbound())
group = ParamGroupNode('group')
group.add_children([p1, p2])
self.assertEqual(p2.value(obj=b), factor * p1.value(obj=b))
def test_bound_descriptor(self):
class Bar(object):
def __init__(self, v):
self._v = v
def value(self):
return self._v
def set_value(self, v):
self._v = v
b = Bar(3)
p = ParamNode(type=int,
validator=Interval(0, 5),
fget=b.value,
fset=b.set_value)
self.assertEqual(p.name(), b.value.__name__)
self.assertEqual(b.value(), p.value())
b.set_value(4)
self.assertEqual(b.value(), p.value())
p.set_value(5)
self.assertEqual(b.value(), p.value())
with self.assertRaises(ValueError):
p.set_value(6)
# unfortunately, it is still possible to assign
# an invalid value to the data object directly
b.set_value(6)
# but a ValueError will be thrown when we try
# to access the value
with self.assertRaises(ValueError):
p.value()