def test_lookup():
change = signal('change', 'attribute')
d = {}
sentinel = object()
d[change('name')] = sentinel
assert_that(d[change('name')], equal_to(sentinel))
def test_define_parameterisation():
change = signal('change', 'attribute')
p = change('name')
q = change('name')
assert_that(p, instance_of(signal))
assert_that(p, equal_to(q))
assert_that(hash(p), equal_to(hash(q)))
def test_free_signal():
sentinel = object()
source = Source()
listener = mock.Mock()
sig = signal('spam')
subscribe(source, 'spam', listener.spam_cb)
sig(source, s=sentinel)
assert_that(listener.spam_cb, called_once_with(s=sentinel))
def test_subscribe_generic():
s = Source()
l = mock.Mock()
sentinel = object()
change = signal('change', 'attribute')
p = change('name')
change.subscribe(s, l)
p.publish(s, s=sentinel)
assert_that(l, called_once_with(s=sentinel))
def test_subscribe_mismatch():
s = Source()
l = mock.Mock()
sentinel = object()
change = signal('change', 'attribute')
p = change('name')
q = change('age')
q.subscribe(s, l)
p.publish(s, s=sentinel)
assert_that(p, is_not(equal_to(q)))
assert_that(l, has_property('call_count', 0))
def test_disallows_publish_without_all_parameters():
change = signal('change', 'attribute', 'type')
p = change('name')
with assert_raises(instance_of(TypeError)):
p(Source())
def test_different_parameterisations_compare_unequal():
change = signal('change', 'attribute')
p = change('name')
q = change('age')
assert_that(p, is_not(equal_to(q)))
def test_empty_parameters_compare_equal_to_parent():
change = signal('change', 'attribute')
p = change()
assert_that(p, equal_to(change))
def test_define_with_unhashable_raises():
change = signal('change', 'context')
with assert_raises(instance_of(TypeError)):
change([])
def test_define_parameterised():
change = signal('change', 'attribute')
assert_that(change, instance_of(signal))
