def setUp(self):
"""
Set up a basic test porthole.
"""
self.emitter = Porthole()
def setUp(self):
"""
Set up a basic test porthole.
"""
self.emitter = Porthole()
class PortholeTests(TestCase):
"""
Tests for L{Porthole}.
"""
def setUp(self):
"""
Set up a basic test porthole.
"""
self.emitter = Porthole()
def test_noObservers(self):
"""
Emitting an event when there are no observers does nothing.
"""
self.emitter.emitEvent(u'anEvent')
self.assertEqual(self.emitter.observers, [])
def test_addObserver(self):
"""
Invoking C{addObserver} adds an observer to the list, and returns a
callable that can be used to remove the observer again.
"""
r = self.emitter.addObserver(None)
self.assertEqual(self.emitter.observers, [None])
r()
self.assertEqual(self.emitter.observers, [])
def test_twoObservers(self):
"""
Emitting an event when there are two observers causes two callbacks to
occur.
"""
self.observed = 0
def _obs(event):
self.observed += 1
self.emitter.addObserver(_obs)
self.emitter.addObserver(_obs)
self.emitter.emitEvent(u'anEvent')
self.assertEqual(self.observed, 2)
self.assertEqual(len(self.emitter.observers), 2)
def test_reentrancy(self):
"""
Adding or removing observers from within an observer callback have no
effect on the event currently being emitted.
"""
def _obs(event):
self.observed += 1
def _obsWithRemove(event):
self.observed += 1
r()
r2()
def _obsWithAdd(event):
self.observed += 1
self.emitter.addObserver(_obsWithAdd)
r = self.emitter.addObserver(_obsWithRemove)
r2 = self.emitter.addObserver(_obs)
self.observed = 0
self.emitter.emitEvent(u'anEvent')
self.assertEqual(self.observed, 2)
self.assertEqual(len(self.emitter.observers), 0)
self.emitter.addObserver(_obsWithAdd)
self.observed = 0
self.emitter.emitEvent(u'anEvent')
self.assertEqual(self.observed, 1)
self.assertEqual(len(self.emitter.observers), 2)
self.observed = 0
self.emitter.emitEvent(u'anEvent')
self.assertEqual(self.observed, 2)
self.assertEqual(len(self.emitter.observers), 4)
class PortholeTests(TestCase):
"""
Tests for L{Porthole}.
"""
def setUp(self):
"""
Set up a basic test porthole.
"""
self.emitter = Porthole()
def test_noObservers(self):
"""
Emitting an event when there are no observers does nothing.
"""
self.emitter.emitEvent(u'anEvent')
self.assertEqual(self.emitter.observers, [])
def test_addObserver(self):
"""
Invoking C{addObserver} adds an observer to the list, and returns a
callable that can be used to remove the observer again.
"""
r = self.emitter.addObserver(None)
self.assertEqual(self.emitter.observers, [None])
r()
self.assertEqual(self.emitter.observers, [])
def test_twoObservers(self):
"""
Emitting an event when there are two observers causes two callbacks to
occur.
"""
self.observed = 0
def _obs(event):
self.observed += 1
self.emitter.addObserver(_obs)
self.emitter.addObserver(_obs)
self.emitter.emitEvent(u'anEvent')
self.assertEqual(self.observed, 2)
self.assertEqual(len(self.emitter.observers), 2)
def test_reentrancy(self):
"""
Adding or removing observers from within an observer callback have no
effect on the event currently being emitted.
"""
def _obs(event):
self.observed += 1
def _obsWithRemove(event):
self.observed += 1
r()
r2()
def _obsWithAdd(event):
self.observed += 1
self.emitter.addObserver(_obsWithAdd)
r = self.emitter.addObserver(_obsWithRemove)
r2 = self.emitter.addObserver(_obs)
self.observed = 0
self.emitter.emitEvent(u'anEvent')
self.assertEqual(self.observed, 2)
self.assertEqual(len(self.emitter.observers), 0)
self.emitter.addObserver(_obsWithAdd)
self.observed = 0
self.emitter.emitEvent(u'anEvent')
self.assertEqual(self.observed, 1)
self.assertEqual(len(self.emitter.observers), 2)
self.observed = 0
self.emitter.emitEvent(u'anEvent')
self.assertEqual(self.observed, 2)
self.assertEqual(len(self.emitter.observers), 4)