class SignalTest(unittest.TestCase):
def setUp(self):
self.signal = Signal()
def test_basic_construction_works(self):
assert self.signal.add_once(simple_listener_returning_true) is None
assert self.signal.num_listeners is 1
def test_add_once_then_add_raises(self):
self.signal = Signal()
self.signal.add_once(simple_listener_returning_true)
self.assertRaises(RuntimeError, self.signal.add, simple_listener_returning_true)
def test_dispatch_no_listeners(self):
self.signal.dispatch()
def test_no_param_dispatch(self):
self.signal.add(simple_listener_returning_true)
self.signal.dispatch()
self.assertRaises(TypeError, self.signal.dispatch, 1)
self.assertRaises(TypeError, self.signal.dispatch, {'someKeyWord': 1})
def test_no_param_dispatch_multiple_times(self):
self.signal.add(simple_listener_returning_true)
self.signal.dispatch()
self.signal.dispatch()
self.signal.dispatch()
def test_add_once_only_fires_once(self):
def mylistener(f):
f.callcount = f.callcount + 1
mylistener.callcount = 0
self.signal.add_once(mylistener)
self.signal.dispatch(mylistener)
self.signal.dispatch(mylistener)
self.assertEqual(mylistener.callcount, 1)
def test_removed_listener_doesnt_fire(self):
def mylistener(f):
f.callcount = f.callcount + 1
mylistener.callcount = 0
self.signal.add(mylistener)
self.signal.remove(mylistener)
self.signal.dispatch(mylistener)
self.assertEqual(mylistener.callcount, 0)
def test_listener_added_twice_doesnt_duplicate(self):
self.signal.add(simple_listener_returning_false)
self.signal.add(simple_listener_returning_false)
self.assertEqual(self.signal.num_listeners, 1)
self.signal.dispatch()
def test_adding_null_doesnt_add_listener(self):
self.assertRaises(ValueError, self.signal.add, None)
