Issue 28668: Skip tests where instanciation of multiprocessing.Queue
would raise ImportError
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@ -89,6 +89,7 @@ __all__ = [
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"bigmemtest", "bigaddrspacetest", "cpython_only", "get_attribute",
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"requires_IEEE_754", "skip_unless_xattr", "requires_zlib",
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"anticipate_failure", "load_package_tests", "detect_api_mismatch",
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"requires_multiprocessing_queue",
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# sys
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"is_jython", "check_impl_detail",
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# network
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@ -1731,6 +1732,22 @@ def impl_detail(msg=None, **guards):
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msg = msg.format(' or '.join(guardnames))
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return unittest.skip(msg)
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_have_mp_queue = None
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def requires_multiprocessing_queue(test):
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"""Skip decorator for tests that use multiprocessing.Queue."""
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global _have_mp_queue
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if _have_mp_queue is None:
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import multiprocessing
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# Without a functioning shared semaphore implementation attempts to
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# instantiate a Queue will result in an ImportError (issue #3770).
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try:
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multiprocessing.Queue()
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_have_mp_queue = True
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except ImportError:
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_have_mp_queue = False
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msg = "requires a functioning shared semaphore implementation"
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return test if _have_mp_queue else unittest.skip(msg)(test)
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def _parse_guards(guards):
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# Returns a tuple ({platform_name: run_me}, default_value)
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if not guards:
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@ -3066,6 +3066,7 @@ if hasattr(logging.handlers, 'QueueListener'):
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self.assertEqual(mock_handle.call_count, 5 * self.repeat,
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'correct number of handled log messages')
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@support.requires_multiprocessing_queue
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@patch.object(logging.handlers.QueueListener, 'handle')
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def test_handle_called_with_mp_queue(self, mock_handle):
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for i in range(self.repeat):
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@ -3082,6 +3083,7 @@ if hasattr(logging.handlers, 'QueueListener'):
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except queue.Empty:
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return []
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@support.requires_multiprocessing_queue
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def test_no_messages_in_queue_after_stop(self):
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"""
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Five messages are logged then the QueueListener is stopped. This
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