def test_derivation_11 (self):
# Test that derivation with keyword slot or property raises.
self.assertRaises (ValueError, lambda: AbstractVariable.derive_type ('DerivedVariable',
object = 'or'))
self.assertRaises (ValueError, lambda: AbstractVariable.derive_type ('DerivedVariable',
object = '__class',
property = 'class'))
def test_derivation_slots (self):
DerivedVariable = AbstractVariable.derive_type ('DerivedVariable')
self.assertRaises (AttributeError, self.non_existing_attribute_setter (DerivedVariable ()))
DerivedVariable = AbstractValueTrackingVariable.derive_type ('DerivedVariable')
self.assertRaises (AttributeError, self.non_existing_attribute_setter (DerivedVariable ()))
DerivedVariable = Variable.derive_type ('DerivedVariable')
self.assertRaises (AttributeError, self.non_existing_attribute_setter (DerivedVariable ()))
def test_derived_variable_changes_frozen_1 (self):
DerivedVariable = AbstractVariable.derive_type ('DerivedVariable',
getter = lambda variable: x)
test = NotifyTestObject ()
x = 1
variable = DerivedVariable ()
variable.store (test.simple_handler)
with variable.changes_frozen ():
x = 2
# Though we never call _value_changed(), changes_frozen() promises to call it
# itself in such cases.
test.assert_results (1, 2)
def test_derived_variable_changes_frozen_1(self):
DerivedVariable = AbstractVariable.derive_type(
'DerivedVariable', getter=lambda variable: x)
test = NotifyTestObject()
x = 1
variable = DerivedVariable()
variable.store(test.simple_handler)
with variable.changes_frozen():
x = 2
# Though we never call _value_changed(), changes_frozen() promises to call it
# itself in such cases.
test.assert_results(1, 2)
def test_with_derived_variable_changes_frozen_1 (self):
DerivedVariable = AbstractVariable.derive_type ('DerivedVariable',
getter = lambda variable: values['x'])
test = NotifyTestObject ()
values = { 'x': 1 }
variable = DerivedVariable ()
variable.store (test.simple_handler)
def do_changes (values):
values['x'] = 2
variable.with_changes_frozen (do_changes, values)
# Though we never call _value_changed(), with_changes_frozen() promises to call it
# itself in such cases.
test.assert_results (1, 2)
def test_derivation_10 (self):
def set_value (list, value):
list[0] = value
DerivedVariable = AbstractVariable.derive_type ('DerivedVariable',
object = '__list', property = 'list',
getter = lambda list: list[0],
setter = set_value)
a = DerivedVariable ([123])
self.assertEqual (a.value, 123)
a.value = 'foo'
self.assertEqual (a.value, 'foo')
self.assertEqual (a.list, ['foo'])
def test_with_derived_variable_changes_frozen_1(self):
DerivedVariable = AbstractVariable.derive_type(
'DerivedVariable', getter=lambda variable: values['x'])
test = NotifyTestObject()
values = {'x': 1}
variable = DerivedVariable()
variable.store(test.simple_handler)
def do_changes(values):
values['x'] = 2
variable.with_changes_frozen(do_changes, values)
# Though we never call _value_changed(), with_changes_frozen() promises to call it
# itself in such cases.
test.assert_results(1, 2)