| 1 | import gc
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| 2 | import os
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| 3 | import sys
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| 4 | import signal
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| 5 | import weakref
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| 6 |
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| 7 | from cStringIO import StringIO
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| 8 |
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| 9 |
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| 10 | import unittest
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| 11 |
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| 12 |
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| 13 | @unittest.skipUnless(hasattr(os, 'kill'), "Test requires os.kill")
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| 14 | @unittest.skipIf(sys.platform =="win32", "Test cannot run on Windows")
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| 15 | @unittest.skipIf(sys.platform == 'freebsd6', "Test kills regrtest on freebsd6 "
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| 16 | "if threads have been used")
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| 17 | class TestBreak(unittest.TestCase):
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| 18 | int_handler = None
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| 19 |
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| 20 | def setUp(self):
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| 21 | self._default_handler = signal.getsignal(signal.SIGINT)
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| 22 | if self.int_handler is not None:
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| 23 | signal.signal(signal.SIGINT, self.int_handler)
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| 24 |
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| 25 | def tearDown(self):
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| 26 | signal.signal(signal.SIGINT, self._default_handler)
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| 27 | unittest.signals._results = weakref.WeakKeyDictionary()
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| 28 | unittest.signals._interrupt_handler = None
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| 29 |
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| 30 |
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| 31 | def testInstallHandler(self):
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| 32 | default_handler = signal.getsignal(signal.SIGINT)
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| 33 | unittest.installHandler()
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| 34 | self.assertNotEqual(signal.getsignal(signal.SIGINT), default_handler)
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| 35 |
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| 36 | try:
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| 37 | pid = os.getpid()
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| 38 | os.kill(pid, signal.SIGINT)
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| 39 | except KeyboardInterrupt:
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| 40 | self.fail("KeyboardInterrupt not handled")
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| 41 |
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| 42 | self.assertTrue(unittest.signals._interrupt_handler.called)
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| 43 |
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| 44 | def testRegisterResult(self):
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| 45 | result = unittest.TestResult()
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| 46 | unittest.registerResult(result)
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| 47 |
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| 48 | for ref in unittest.signals._results:
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| 49 | if ref is result:
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| 50 | break
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| 51 | elif ref is not result:
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| 52 | self.fail("odd object in result set")
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| 53 | else:
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| 54 | self.fail("result not found")
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| 55 |
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| 56 |
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| 57 | def testInterruptCaught(self):
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| 58 | default_handler = signal.getsignal(signal.SIGINT)
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| 59 |
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| 60 | result = unittest.TestResult()
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| 61 | unittest.installHandler()
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| 62 | unittest.registerResult(result)
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| 63 |
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| 64 | self.assertNotEqual(signal.getsignal(signal.SIGINT), default_handler)
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| 65 |
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| 66 | def test(result):
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| 67 | pid = os.getpid()
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| 68 | os.kill(pid, signal.SIGINT)
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| 69 | result.breakCaught = True
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| 70 | self.assertTrue(result.shouldStop)
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| 71 |
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| 72 | try:
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| 73 | test(result)
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| 74 | except KeyboardInterrupt:
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| 75 | self.fail("KeyboardInterrupt not handled")
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| 76 | self.assertTrue(result.breakCaught)
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| 77 |
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| 78 |
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| 79 | def testSecondInterrupt(self):
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| 80 | # Can't use skipIf decorator because the signal handler may have
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| 81 | # been changed after defining this method.
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| 82 | if signal.getsignal(signal.SIGINT) == signal.SIG_IGN:
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| 83 | self.skipTest("test requires SIGINT to not be ignored")
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| 84 | result = unittest.TestResult()
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| 85 | unittest.installHandler()
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| 86 | unittest.registerResult(result)
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| 87 |
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| 88 | def test(result):
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| 89 | pid = os.getpid()
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| 90 | os.kill(pid, signal.SIGINT)
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| 91 | result.breakCaught = True
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| 92 | self.assertTrue(result.shouldStop)
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| 93 | os.kill(pid, signal.SIGINT)
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| 94 | self.fail("Second KeyboardInterrupt not raised")
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| 95 |
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| 96 | try:
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| 97 | test(result)
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| 98 | except KeyboardInterrupt:
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| 99 | pass
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| 100 | else:
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| 101 | self.fail("Second KeyboardInterrupt not raised")
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| 102 | self.assertTrue(result.breakCaught)
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| 103 |
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| 104 |
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| 105 | def testTwoResults(self):
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| 106 | unittest.installHandler()
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| 107 |
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| 108 | result = unittest.TestResult()
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| 109 | unittest.registerResult(result)
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| 110 | new_handler = signal.getsignal(signal.SIGINT)
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| 111 |
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| 112 | result2 = unittest.TestResult()
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| 113 | unittest.registerResult(result2)
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| 114 | self.assertEqual(signal.getsignal(signal.SIGINT), new_handler)
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| 115 |
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| 116 | result3 = unittest.TestResult()
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| 117 |
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| 118 | def test(result):
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| 119 | pid = os.getpid()
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| 120 | os.kill(pid, signal.SIGINT)
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| 121 |
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| 122 | try:
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| 123 | test(result)
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| 124 | except KeyboardInterrupt:
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| 125 | self.fail("KeyboardInterrupt not handled")
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| 126 |
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| 127 | self.assertTrue(result.shouldStop)
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| 128 | self.assertTrue(result2.shouldStop)
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| 129 | self.assertFalse(result3.shouldStop)
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| 130 |
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| 131 |
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| 132 | def testHandlerReplacedButCalled(self):
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| 133 | # Can't use skipIf decorator because the signal handler may have
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| 134 | # been changed after defining this method.
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| 135 | if signal.getsignal(signal.SIGINT) == signal.SIG_IGN:
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| 136 | self.skipTest("test requires SIGINT to not be ignored")
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| 137 | # If our handler has been replaced (is no longer installed) but is
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| 138 | # called by the *new* handler, then it isn't safe to delay the
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| 139 | # SIGINT and we should immediately delegate to the default handler
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| 140 | unittest.installHandler()
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| 141 |
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| 142 | handler = signal.getsignal(signal.SIGINT)
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| 143 | def new_handler(frame, signum):
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| 144 | handler(frame, signum)
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| 145 | signal.signal(signal.SIGINT, new_handler)
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| 146 |
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| 147 | try:
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| 148 | pid = os.getpid()
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| 149 | os.kill(pid, signal.SIGINT)
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| 150 | except KeyboardInterrupt:
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| 151 | pass
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| 152 | else:
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| 153 | self.fail("replaced but delegated handler doesn't raise interrupt")
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| 154 |
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| 155 | def testRunner(self):
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| 156 | # Creating a TextTestRunner with the appropriate argument should
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| 157 | # register the TextTestResult it creates
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| 158 | runner = unittest.TextTestRunner(stream=StringIO())
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| 159 |
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| 160 | result = runner.run(unittest.TestSuite())
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| 161 | self.assertIn(result, unittest.signals._results)
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| 162 |
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| 163 | def testWeakReferences(self):
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| 164 | # Calling registerResult on a result should not keep it alive
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| 165 | result = unittest.TestResult()
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| 166 | unittest.registerResult(result)
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| 167 |
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| 168 | ref = weakref.ref(result)
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| 169 | del result
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| 170 |
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| 171 | # For non-reference counting implementations
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| 172 | gc.collect();gc.collect()
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| 173 | self.assertIsNone(ref())
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| 174 |
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| 175 |
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| 176 | def testRemoveResult(self):
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| 177 | result = unittest.TestResult()
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| 178 | unittest.registerResult(result)
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| 179 |
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| 180 | unittest.installHandler()
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| 181 | self.assertTrue(unittest.removeResult(result))
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| 182 |
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| 183 | # Should this raise an error instead?
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| 184 | self.assertFalse(unittest.removeResult(unittest.TestResult()))
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| 185 |
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| 186 | try:
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| 187 | pid = os.getpid()
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| 188 | os.kill(pid, signal.SIGINT)
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| 189 | except KeyboardInterrupt:
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| 190 | pass
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| 191 |
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| 192 | self.assertFalse(result.shouldStop)
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| 193 |
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| 194 | def testMainInstallsHandler(self):
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| 195 | failfast = object()
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| 196 | test = object()
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| 197 | verbosity = object()
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| 198 | result = object()
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| 199 | default_handler = signal.getsignal(signal.SIGINT)
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| 200 |
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| 201 | class FakeRunner(object):
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| 202 | initArgs = []
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| 203 | runArgs = []
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| 204 | def __init__(self, *args, **kwargs):
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| 205 | self.initArgs.append((args, kwargs))
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| 206 | def run(self, test):
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| 207 | self.runArgs.append(test)
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| 208 | return result
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| 209 |
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| 210 | class Program(unittest.TestProgram):
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| 211 | def __init__(self, catchbreak):
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| 212 | self.exit = False
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| 213 | self.verbosity = verbosity
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| 214 | self.failfast = failfast
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| 215 | self.catchbreak = catchbreak
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| 216 | self.testRunner = FakeRunner
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| 217 | self.test = test
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| 218 | self.result = None
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| 219 |
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| 220 | p = Program(False)
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| 221 | p.runTests()
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| 222 |
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| 223 | self.assertEqual(FakeRunner.initArgs, [((), {'buffer': None,
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| 224 | 'verbosity': verbosity,
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| 225 | 'failfast': failfast})])
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| 226 | self.assertEqual(FakeRunner.runArgs, [test])
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| 227 | self.assertEqual(p.result, result)
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| 228 |
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| 229 | self.assertEqual(signal.getsignal(signal.SIGINT), default_handler)
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| 230 |
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| 231 | FakeRunner.initArgs = []
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| 232 | FakeRunner.runArgs = []
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| 233 | p = Program(True)
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| 234 | p.runTests()
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| 235 |
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| 236 | self.assertEqual(FakeRunner.initArgs, [((), {'buffer': None,
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| 237 | 'verbosity': verbosity,
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| 238 | 'failfast': failfast})])
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| 239 | self.assertEqual(FakeRunner.runArgs, [test])
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| 240 | self.assertEqual(p.result, result)
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| 241 |
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| 242 | self.assertNotEqual(signal.getsignal(signal.SIGINT), default_handler)
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| 243 |
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| 244 | def testRemoveHandler(self):
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| 245 | default_handler = signal.getsignal(signal.SIGINT)
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| 246 | unittest.installHandler()
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| 247 | unittest.removeHandler()
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| 248 | self.assertEqual(signal.getsignal(signal.SIGINT), default_handler)
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| 249 |
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| 250 | # check that calling removeHandler multiple times has no ill-effect
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| 251 | unittest.removeHandler()
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| 252 | self.assertEqual(signal.getsignal(signal.SIGINT), default_handler)
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| 253 |
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| 254 | def testRemoveHandlerAsDecorator(self):
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| 255 | default_handler = signal.getsignal(signal.SIGINT)
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| 256 | unittest.installHandler()
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| 257 |
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| 258 | @unittest.removeHandler
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| 259 | def test():
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| 260 | self.assertEqual(signal.getsignal(signal.SIGINT), default_handler)
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| 261 |
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| 262 | test()
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| 263 | self.assertNotEqual(signal.getsignal(signal.SIGINT), default_handler)
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| 264 |
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| 265 | @unittest.skipUnless(hasattr(os, 'kill'), "Test requires os.kill")
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| 266 | @unittest.skipIf(sys.platform =="win32", "Test cannot run on Windows")
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| 267 | @unittest.skipIf(sys.platform == 'freebsd6', "Test kills regrtest on freebsd6 "
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| 268 | "if threads have been used")
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| 269 | class TestBreakDefaultIntHandler(TestBreak):
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| 270 | int_handler = signal.default_int_handler
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| 271 |
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| 272 | @unittest.skipUnless(hasattr(os, 'kill'), "Test requires os.kill")
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| 273 | @unittest.skipIf(sys.platform =="win32", "Test cannot run on Windows")
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| 274 | @unittest.skipIf(sys.platform == 'freebsd6', "Test kills regrtest on freebsd6 "
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| 275 | "if threads have been used")
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| 276 | class TestBreakSignalIgnored(TestBreak):
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| 277 | int_handler = signal.SIG_IGN
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| 278 |
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| 279 | @unittest.skipUnless(hasattr(os, 'kill'), "Test requires os.kill")
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| 280 | @unittest.skipIf(sys.platform =="win32", "Test cannot run on Windows")
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| 281 | @unittest.skipIf(sys.platform == 'freebsd6', "Test kills regrtest on freebsd6 "
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| 282 | "if threads have been used")
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| 283 | class TestBreakSignalDefault(TestBreak):
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| 284 | int_handler = signal.SIG_DFL
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