def test_callProcessExitedMissing(self):
"""
L{BaseProcess._callProcessExited} emits a L{DeprecationWarning} if the
object referred to by its C{proto} attribute has no C{processExited}
method.
"""
class FakeProto:
pass
reason = object()
process = BaseProcess(FakeProto())
self.addCleanup(setWarningMethod, getWarningMethod())
warnings = []
def collect(message, category, stacklevel):
warnings.append((message, category, stacklevel))
setWarningMethod(collect)
process._callProcessExited(reason)
[(message, category, stacklevel)] = warnings
self.assertEqual(
message,
"Since Twisted 8.2, IProcessProtocol.processExited is required. "
"%s.%s must implement it." %
(FakeProto.__module__, FakeProto.__name__))
self.assertIs(category, DeprecationWarning)
# The stacklevel doesn't really make sense for this kind of
# deprecation. Requiring it to be 0 will at least avoid pointing to
# any part of Twisted or a random part of the application's code, which
# I think would be more misleading than having it point inside the
# warning system itself. -exarkun
self.assertEqual(stacklevel, 0)
def test_callProcessExited(self):
"""
L{BaseProcess._callProcessExited} calls the C{processExited} method of
its C{proto} attribute and passes it a L{Failure} wrapping the given
exception.
"""
class FakeProto:
reason = None
def processExited(self, reason):
self.reason = reason
reason = RuntimeError("fake reason")
process = BaseProcess(FakeProto())
process._callProcessExited(reason)
process.proto.reason.trap(RuntimeError)
self.assertIs(reason, process.proto.reason.value)
