def test_invalid_binding_fails(self):
ex = self.Example('fred', 'flintstone')
ex2 = self.Example('barney', 'rubble')
tester = bindings.Binding(bindings.get_accessor(ex, 'name'),
bindings.get_accessor(ex2, 'val'))
tester.invalidate()
assert not tester()
def test_binding_source_order(self):
ex = self.Example('fred', 'flintstone')
ex2 = self.Example('barney', 'rubble')
tester = bindings.Binding(bindings.get_accessor(ex, 'name'),
bindings.get_accessor(ex2, 'val'))
assert tester.getter.target.name == 'fred'
assert tester.setter.target.name == 'barney'
def test_basic_binding_update(self):
ex = self.Example('fred', 'flintstone')
ex2 = self.Example('barney', 'rubble')
tester = bindings.Binding(bindings.get_accessor(ex, 'name'),
bindings.get_accessor(ex2, 'val'))
tester()
assert ex2.val == ex.name
def test_binding_survives_object_deletion(self):
ex = self.Example('fred', 'flintstone')
ex2 = self.Example('barney', 'rubble')
tester = bindings.Binding(bindings.get_accessor(ex, 'name'),
bindings.get_accessor(ex2, 'val'))
del (ex)
assert not tester() # deleted referent = failed binding
assert ex2.val == 'rubble' # so value is unchanged
def test_bindings_except_when_allowed(self):
ex = self.Example('fred', 'flintstone')
ex2 = self.Example('barney', 'rubble')
tester = bindings.Binding(bindings.get_accessor(ex, 'name'),
bindings.get_accessor(ex2, 'val'))
bindings.BREAK_ON_ACCESS_FAILURE = True
bindings.BREAK_ON_BIND_FAILURE = True
del (ex)
self.assertRaises(bindings.BindingError, tester)
def test_binding_excepts_on_bad_arguments(self):
self.assertRaises(bindings.BindingError,
lambda: bindings.Binding(None, None))