当使用twisted和trial启动两个等效的unittest时,ReactorNotRestartable

Question

我有两个测试类(TrialTest1和TrialTest2)写在两个文件(test_trial1.py和test_trial2.py)中大多数相同(唯一的区别是类名):

from twisted.internet import reactor
from twisted.trial import unittest


class TrialTest1(unittest.TestCase):

    def setUp(self):
        print("setUp()")

    def test_main(self):
        print("test_main")
        reactor.callLater(1, self._called_by_deffered1)
        reactor.run()

    def _called_by_deffered1(self):
        print("_called_by_deffered1")
        reactor.callLater(1, self._called_by_deffered2)

    def _called_by_deffered2(self):
        print("_called_by_deffered2")
        reactor.stop()

    def tearDown(self):
        print("tearDown()")

当我完全运行每个测试时,一切都很好.但是当我启动它时,我有以下输出:

setUp()
test_main
_called_by_deffered1
_called_by_deffered2
tearDown()
setUp()
test_main
tearDown()

Error
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/twisted/internet/defer.py", line 137, in maybeDeferred
    result = f(*args, **kw)
  File "/usr/lib/python2.7/site-packages/twisted/internet/utils.py", line 203, in runWithWarningsSuppressed
    reraise(exc_info[1], exc_info[2])
  File "/usr/lib/python2.7/site-packages/twisted/internet/utils.py", line 199, in runWithWarningsSuppressed
    result = f(*a, **kw)
  File "/home/kartoch/works/python/netkython/tests/test_twisted_trial2.py", line 13, in test_main
    reactor.run()
  File "/usr/lib/python2.7/site-packages/twisted/internet/base.py", line 1191, in run
    self.startRunning(installSignalHandlers=installSignalHandlers)
  File "/usr/lib/python2.7/site-packages/twisted/internet/base.py", line 1171, in startRunning
    ReactorBase.startRunning(self)
  File "/usr/lib/python2.7/site-packages/twisted/internet/base.py", line 683, in startRunning
    raise error.ReactorNotRestartable()
ReactorNotRestartable


Error
DirtyReactorAggregateError: Reactor was unclean.
DelayedCalls: (set twisted.internet.base.DelayedCall.debug = True to debug)
<DelayedCall 0x8d6482c [0.98535490036s] called=0 cancelled=0 TrialTest2._called_by_deffered1()>


Process finished with exit code 0

在第一次测试后,反应堆似乎没有正确关闭.有谁知道问题出在哪里？它似乎tearDown()被提前调用(_called_by_deffered1在第二次测试之前),也许可以使用deferTearDown(没有记录的试验单元测试方法).

编辑

提出的解决方案之一是删除reactor.run()并且reactor.stop()因为反应器不可重新启动,并且默认情况下您只有一个反应器实例用于所有测试:

class TrialTest1(unittest.TestCase):

    def setUp(self):
        print("setUp()")

    def test_main(self):
        print("test_main")
        reactor.callLater(1, self._called_by_deffered1)

    def _called_by_deffered1(self):
        print("_called_by_deffered1")
        reactor.callLater(1, self._called_by_deffered2)

    def _called_by_deffered2(self):
        print("_called_by_deffered2")

    def tearDown(self):
        print("tearDown()")

但是当删除对这些方法的调用时,我的测试失败而没有执行_called_by_deffered方法:

setUp()
test_main
tearDown()

Error
DirtyReactorAggregateError: Reactor was unclean.
DelayedCalls: (set twisted.internet.base.DelayedCall.debug = True to debug)
<DelayedCall 0x94967ec [0.99936413765s] called=0 cancelled=0 TrialTest1._called_by_deffered1()>

setUp()
test_main
tearDown()

Error
DirtyReactorAggregateError: Reactor was unclean.
DelayedCalls: (set twisted.internet.base.DelayedCall.debug = True to debug)
<DelayedCall 0x94968cc [0.99958896637s] called=0 cancelled=0 TrialTest2._called_by_deffered1()>

如果我只想在测试之间只使用一个reactor共享实例,那么_called_by_deffered方法如何 成为测试的一部分(即之前执行tearDown)？

Answer 1

在 Jean-Paul、此页面和此问题的帮助下，我已经能够使用twisted.internet.task.deferLater(). 总结一下我正在寻找的要点：如果测试方法返回延迟，则仅当所有延迟都被触发时才会调用“tearDown()”方法。

这是代码：

from twisted.trial import unittest
from twisted.internet import reactor, task


class TrialTest1(unittest.TestCase):

    def setUp(self):
        print("setUp()")

    def test_main(self):
        print("test_main()")
        return task.deferLater(reactor, 1, self._called_by_deffered1)

    def _called_by_deffered1(self):
        print("_called_by_deffered1()")
        return task.deferLater(reactor, 1, self._called_by_deffered2)

    def _called_by_deffered2(self):
        print("_called_by_deffered2()")

    def tearDown(self):
        print("tearDown()")

输出：

setUp() 
test_main()

// (1s wait)

_called_by_deffered1()

// (1s wait)

_called_by_deffered2()
tearDown()