def test_callbackResultChangesValue(self):
"""
The result of a callback affects the result returned from
C{synchronize}.
"""
sd = SynchronousDeferred("foo")
sd.addCallback(lambda r: 42)
self.assertEquals(sd.synchronize(), 42)
def test_callbackResultChangesNextCallbackArgument(self):
"""
The result of a callback affects the argument passed to the next
callback.
"""
sd = SynchronousDeferred("foo")
sd.addCallback(lambda r: 42)
l = []
sd.addCallback(l.append)
self.assertEquals(l, [42])
def test_errbackResultChangesNextCallbackArgument(self):
"""
The result of an errback affects the argument passed to the next
callback.
"""
sd = SynchronousDeferred(SynchronousFailure(RuntimeError()))
sd.addErrback(lambda r: 42)
l = []
sd.addCallback(l.append)
self.assertEquals(l, [42])
def test_errorRaisingCallback(self):
"""
If a callback raises an exception, errbacks will be called.
"""
sd = SynchronousDeferred("foo")
def callback(ignored):
1/0
sd.addCallback(callback)
l = []
sd.addErrback(l.append)
self.assertEquals(len(l), 1)
self.assertTrue(l[0].check(ZeroDivisionError))
def test_addCallback(self):
"""
C{addCallback} calls the callback passed immediately and returns itself.
"""
l = []
sd = SynchronousDeferred(None)
self.assertEquals(sd.addCallback(l.append), sd)
self.assertEquals(l, [None])
