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Current File : /opt/alt/python37/lib/python3.7/site-packages/nose/__pycache__/twistedtools.cpython-37.pyc
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Twisted integration
-------------------

This module provides a very simple way to integrate your tests with the
Twisted_ event loop.

You must import this module *before* importing anything from Twisted itself!

Example::

  from nose.twistedtools import reactor, deferred
  
  @deferred()
  def test_resolve():
      return reactor.resolve("www.python.org")

Or, more realistically::

  @deferred(timeout=5.0)
  def test_resolve():
      d = reactor.resolve("www.python.org")
      def check_ip(ip):
          assert ip == "67.15.36.43"
      d.addCallback(check_ip)
      return d

.. _Twisted: http://twistedmatrix.com/trac/
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    Start the Twisted reactor in a separate thread, if not already done.
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    By wrapping a test function with this decorator, you can return a
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    The whole test function will run inside the Twisted event loop.

    The optional timeout parameter specifies the maximum duration of the test.
    The difference with timed() is that timed() will still wait for the test
    to end, while deferred() will stop the test when its timeout has expired.
    The latter is more desireable when dealing with network tests, because
    the result may actually never arrive.

    If the callback is triggered, the test has passed.
    If the errback is triggered or the timeout expires, the test has failed.

    Example::
    
        @deferred(timeout=5.0)
        def test_resolve():
            return reactor.resolve("www.python.org")

    Attention! If you combine this decorator with other decorators (like
    "raises"), deferred() must be called *first*!

    In other words, this is good::
        
        @raises(DNSLookupError)
        @deferred()
        def test_error():
            return reactor.resolve("xxxjhjhj.biz")

    and this is bad::
        
        @deferred()
        @raises(DNSLookupError)
        def test_error():
            return reactor.resolve("xxxjhjhj.biz")
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