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281 lines
9.3 KiB
281 lines
9.3 KiB
import gc
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import io
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import os
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import sys
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import signal
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import weakref
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import unittest
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@unittest.skipUnless(hasattr(os, 'kill'), "Test requires os.kill")
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@unittest.skipIf(sys.platform =="win32", "Test cannot run on Windows")
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class TestBreak(unittest.TestCase):
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int_handler = None
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def setUp(self):
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self._default_handler = signal.getsignal(signal.SIGINT)
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if self.int_handler is not None:
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signal.signal(signal.SIGINT, self.int_handler)
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def tearDown(self):
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signal.signal(signal.SIGINT, self._default_handler)
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unittest.signals._results = weakref.WeakKeyDictionary()
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unittest.signals._interrupt_handler = None
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def testInstallHandler(self):
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default_handler = signal.getsignal(signal.SIGINT)
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unittest.installHandler()
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self.assertNotEqual(signal.getsignal(signal.SIGINT), default_handler)
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try:
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pid = os.getpid()
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os.kill(pid, signal.SIGINT)
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except KeyboardInterrupt:
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self.fail("KeyboardInterrupt not handled")
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self.assertTrue(unittest.signals._interrupt_handler.called)
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def testRegisterResult(self):
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result = unittest.TestResult()
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self.assertNotIn(result, unittest.signals._results)
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unittest.registerResult(result)
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try:
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self.assertIn(result, unittest.signals._results)
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finally:
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unittest.removeResult(result)
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def testInterruptCaught(self):
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default_handler = signal.getsignal(signal.SIGINT)
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result = unittest.TestResult()
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unittest.installHandler()
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unittest.registerResult(result)
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self.assertNotEqual(signal.getsignal(signal.SIGINT), default_handler)
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def test(result):
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pid = os.getpid()
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os.kill(pid, signal.SIGINT)
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result.breakCaught = True
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self.assertTrue(result.shouldStop)
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try:
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test(result)
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except KeyboardInterrupt:
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self.fail("KeyboardInterrupt not handled")
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self.assertTrue(result.breakCaught)
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def testSecondInterrupt(self):
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# Can't use skipIf decorator because the signal handler may have
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# been changed after defining this method.
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if signal.getsignal(signal.SIGINT) == signal.SIG_IGN:
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self.skipTest("test requires SIGINT to not be ignored")
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result = unittest.TestResult()
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unittest.installHandler()
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unittest.registerResult(result)
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def test(result):
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pid = os.getpid()
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os.kill(pid, signal.SIGINT)
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result.breakCaught = True
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self.assertTrue(result.shouldStop)
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os.kill(pid, signal.SIGINT)
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self.fail("Second KeyboardInterrupt not raised")
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try:
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test(result)
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except KeyboardInterrupt:
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pass
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else:
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self.fail("Second KeyboardInterrupt not raised")
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self.assertTrue(result.breakCaught)
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def testTwoResults(self):
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unittest.installHandler()
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result = unittest.TestResult()
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unittest.registerResult(result)
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new_handler = signal.getsignal(signal.SIGINT)
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result2 = unittest.TestResult()
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unittest.registerResult(result2)
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self.assertEqual(signal.getsignal(signal.SIGINT), new_handler)
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result3 = unittest.TestResult()
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def test(result):
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pid = os.getpid()
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os.kill(pid, signal.SIGINT)
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try:
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test(result)
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except KeyboardInterrupt:
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self.fail("KeyboardInterrupt not handled")
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self.assertTrue(result.shouldStop)
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self.assertTrue(result2.shouldStop)
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self.assertFalse(result3.shouldStop)
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def testHandlerReplacedButCalled(self):
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# Can't use skipIf decorator because the signal handler may have
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# been changed after defining this method.
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if signal.getsignal(signal.SIGINT) == signal.SIG_IGN:
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self.skipTest("test requires SIGINT to not be ignored")
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# If our handler has been replaced (is no longer installed) but is
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# called by the *new* handler, then it isn't safe to delay the
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# SIGINT and we should immediately delegate to the default handler
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unittest.installHandler()
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handler = signal.getsignal(signal.SIGINT)
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def new_handler(frame, signum):
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handler(frame, signum)
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signal.signal(signal.SIGINT, new_handler)
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try:
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pid = os.getpid()
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os.kill(pid, signal.SIGINT)
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except KeyboardInterrupt:
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pass
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else:
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self.fail("replaced but delegated handler doesn't raise interrupt")
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def testRunner(self):
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# Creating a TextTestRunner with the appropriate argument should
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# register the TextTestResult it creates
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runner = unittest.TextTestRunner(stream=io.StringIO())
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result = runner.run(unittest.TestSuite())
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self.assertIn(result, unittest.signals._results)
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def testWeakReferences(self):
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# Calling registerResult on a result should not keep it alive
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result = unittest.TestResult()
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unittest.registerResult(result)
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ref = weakref.ref(result)
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del result
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# For non-reference counting implementations
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gc.collect();gc.collect()
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self.assertIsNone(ref())
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def testRemoveResult(self):
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result = unittest.TestResult()
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unittest.registerResult(result)
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unittest.installHandler()
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self.assertTrue(unittest.removeResult(result))
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# Should this raise an error instead?
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self.assertFalse(unittest.removeResult(unittest.TestResult()))
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try:
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pid = os.getpid()
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os.kill(pid, signal.SIGINT)
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except KeyboardInterrupt:
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pass
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self.assertFalse(result.shouldStop)
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def testMainInstallsHandler(self):
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failfast = object()
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test = object()
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verbosity = object()
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result = object()
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default_handler = signal.getsignal(signal.SIGINT)
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class FakeRunner(object):
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initArgs = []
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runArgs = []
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def __init__(self, *args, **kwargs):
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self.initArgs.append((args, kwargs))
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def run(self, test):
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self.runArgs.append(test)
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return result
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class Program(unittest.TestProgram):
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def __init__(self, catchbreak):
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self.exit = False
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self.verbosity = verbosity
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self.failfast = failfast
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self.catchbreak = catchbreak
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self.tb_locals = False
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self.testRunner = FakeRunner
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self.test = test
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self.result = None
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p = Program(False)
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p.runTests()
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self.assertEqual(FakeRunner.initArgs, [((), {'buffer': None,
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'verbosity': verbosity,
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'failfast': failfast,
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'tb_locals': False,
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'warnings': None})])
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self.assertEqual(FakeRunner.runArgs, [test])
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self.assertEqual(p.result, result)
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self.assertEqual(signal.getsignal(signal.SIGINT), default_handler)
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FakeRunner.initArgs = []
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FakeRunner.runArgs = []
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p = Program(True)
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p.runTests()
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self.assertEqual(FakeRunner.initArgs, [((), {'buffer': None,
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'verbosity': verbosity,
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'failfast': failfast,
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'tb_locals': False,
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'warnings': None})])
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self.assertEqual(FakeRunner.runArgs, [test])
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self.assertEqual(p.result, result)
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self.assertNotEqual(signal.getsignal(signal.SIGINT), default_handler)
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def testRemoveHandler(self):
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default_handler = signal.getsignal(signal.SIGINT)
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unittest.installHandler()
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unittest.removeHandler()
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self.assertEqual(signal.getsignal(signal.SIGINT), default_handler)
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# check that calling removeHandler multiple times has no ill-effect
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unittest.removeHandler()
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self.assertEqual(signal.getsignal(signal.SIGINT), default_handler)
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def testRemoveHandlerAsDecorator(self):
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default_handler = signal.getsignal(signal.SIGINT)
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unittest.installHandler()
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@unittest.removeHandler
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def test():
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self.assertEqual(signal.getsignal(signal.SIGINT), default_handler)
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test()
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self.assertNotEqual(signal.getsignal(signal.SIGINT), default_handler)
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@unittest.skipUnless(hasattr(os, 'kill'), "Test requires os.kill")
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@unittest.skipIf(sys.platform =="win32", "Test cannot run on Windows")
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class TestBreakDefaultIntHandler(TestBreak):
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int_handler = signal.default_int_handler
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@unittest.skipUnless(hasattr(os, 'kill'), "Test requires os.kill")
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@unittest.skipIf(sys.platform =="win32", "Test cannot run on Windows")
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class TestBreakSignalIgnored(TestBreak):
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int_handler = signal.SIG_IGN
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@unittest.skipUnless(hasattr(os, 'kill'), "Test requires os.kill")
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@unittest.skipIf(sys.platform =="win32", "Test cannot run on Windows")
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class TestBreakSignalDefault(TestBreak):
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int_handler = signal.SIG_DFL
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if __name__ == "__main__":
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unittest.main()
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