Mercurial > cpython-lru_cache-weakref

annotate Lib/test/test_contextlib.py @ 60174:255a401c19b0

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(partially) Merged revisions 79534,79537,79539,79558,79606 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r79534 | florent.xicluna | 2010-03-31 23:21:54 +0200 (mer, 31 mar 2010) | 2 lines Fix test for xml.etree when using a non-ascii path. And use check_warnings instead of catch_warnings. ........ r79537 | florent.xicluna | 2010-03-31 23:40:32 +0200 (mer, 31 mar 2010) | 2 lines Fix typo ........ r79539 | florent.xicluna | 2010-04-01 00:01:03 +0200 (jeu, 01 avr 2010) | 2 lines Replace catch_warnings with check_warnings when it makes sense. Use assertRaises context manager to simplify some tests. ........ r79558 | florent.xicluna | 2010-04-01 20:17:09 +0200 (jeu, 01 avr 2010) | 2 lines #7092: Fix some -3 warnings, and fix Lib/platform.py when the path contains a double-quote. ........ r79606 | florent.xicluna | 2010-04-02 19:26:42 +0200 (ven, 02 avr 2010) | 2 lines Backport some robotparser test and skip the test if the external resource is not available. ........
author Florent Xicluna <florent.xicluna@gmail.com>
date Fri, 02 Apr 2010 18:52:12 +0000
parents b93cfafcdcad
children 493bb4585e38
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1 """Unit tests for contextlib.py, and other context managers."""
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2
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3 import sys
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4 import tempfile
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5 import unittest
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6 import threading
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7 from contextlib import * # Tests __all__
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8 from test import support
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9
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10
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11 class ContextManagerTestCase(unittest.TestCase):
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12
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13 def test_contextmanager_plain(self):
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14 state = []
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15 @contextmanager
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16 def woohoo():
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17 state.append(1)
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18 yield 42
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19 state.append(999)
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20 with woohoo() as x:
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21 self.assertEqual(state, [1])
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22 self.assertEqual(x, 42)
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23 state.append(x)
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24 self.assertEqual(state, [1, 42, 999])
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25
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26 def test_contextmanager_finally(self):
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27 state = []
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28 @contextmanager
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29 def woohoo():
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30 state.append(1)
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31 try:
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32 yield 42
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33 finally:
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34 state.append(999)
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35 with self.assertRaises(ZeroDivisionError):
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36 with woohoo() as x:
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37 self.assertEqual(state, [1])
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38 self.assertEqual(x, 42)
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39 state.append(x)
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40 raise ZeroDivisionError()
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41 self.assertEqual(state, [1, 42, 999])
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42
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43 def test_contextmanager_no_reraise(self):
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44 @contextmanager
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45 def whee():
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46 yield
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47 ctx = whee()
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48 ctx.__enter__()
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49 # Calling __exit__ should not result in an exception
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50 self.assertFalse(ctx.__exit__(TypeError, TypeError("foo"), None))
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51
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52 def test_contextmanager_trap_yield_after_throw(self):
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53 @contextmanager
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54 def whoo():
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55 try:
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56 yield
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57 except:
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58 yield
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59 ctx = whoo()
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60 ctx.__enter__()
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61 self.assertRaises(
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62 RuntimeError, ctx.__exit__, TypeError, TypeError("foo"), None
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63 )
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64
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65 def test_contextmanager_except(self):
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66 state = []
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67 @contextmanager
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68 def woohoo():
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69 state.append(1)
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70 try:
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71 yield 42
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72 except ZeroDivisionError as e:
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73 state.append(e.args[0])
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74 self.assertEqual(state, [1, 42, 999])
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75 with woohoo() as x:
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76 self.assertEqual(state, [1])
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77 self.assertEqual(x, 42)
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78 state.append(x)
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79 raise ZeroDivisionError(999)
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80 self.assertEqual(state, [1, 42, 999])
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81
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82 def _create_contextmanager_attribs(self):
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83 def attribs(**kw):
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84 def decorate(func):
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85 for k,v in kw.items():
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86 setattr(func,k,v)
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87 return func
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88 return decorate
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89 @contextmanager
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90 @attribs(foo='bar')
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91 def baz(spam):
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92 """Whee!"""
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93 return baz
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94
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95 def test_contextmanager_attribs(self):
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96 baz = self._create_contextmanager_attribs()
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97 self.assertEqual(baz.__name__,'baz')
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98 self.assertEqual(baz.foo, 'bar')
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99
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100 @unittest.skipIf(sys.flags.optimize >= 2,
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101 "Docstrings are omitted with -O2 and above")
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102 def test_contextmanager_doc_attrib(self):
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103 baz = self._create_contextmanager_attribs()
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104 self.assertEqual(baz.__doc__, "Whee!")
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105
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106 class ClosingTestCase(unittest.TestCase):
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107
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108 # XXX This needs more work
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109
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110 def test_closing(self):
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111 state = []
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112 class C:
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113 def close(self):
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114 state.append(1)
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115 x = C()
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116 self.assertEqual(state, [])
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117 with closing(x) as y:
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118 self.assertEqual(x, y)
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119 self.assertEqual(state, [1])
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120
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121 def test_closing_error(self):
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122 state = []
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123 class C:
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124 def close(self):
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125 state.append(1)
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126 x = C()
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127 self.assertEqual(state, [])
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128 with self.assertRaises(ZeroDivisionError):
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129 with closing(x) as y:
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130 self.assertEqual(x, y)
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131 1 / 0
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132 self.assertEqual(state, [1])
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133
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134 class FileContextTestCase(unittest.TestCase):
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135
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136 def testWithOpen(self):
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137 tfn = tempfile.mktemp()
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138 try:
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139 f = None
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140 with open(tfn, "w") as f:
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141 self.assertFalse(f.closed)
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142 f.write("Booh\n")
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143 self.assertTrue(f.closed)
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144 f = None
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145 with self.assertRaises(ZeroDivisionError):
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146 with open(tfn, "r") as f:
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147 self.assertFalse(f.closed)
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148 self.assertEqual(f.read(), "Booh\n")
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149 1 / 0
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150 self.assertTrue(f.closed)
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151 finally:
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152 support.unlink(tfn)
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153
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154 class LockContextTestCase(unittest.TestCase):
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155
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156 def boilerPlate(self, lock, locked):
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157 self.assertFalse(locked())
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158 with lock:
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159 self.assertTrue(locked())
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160 self.assertFalse(locked())
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161 with self.assertRaises(ZeroDivisionError):
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162 with lock:
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163 self.assertTrue(locked())
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165 self.assertFalse(locked())
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166
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167 def testWithLock(self):
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168 lock = threading.Lock()
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169 self.boilerPlate(lock, lock.locked)
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170
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171 def testWithRLock(self):
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172 lock = threading.RLock()
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173 self.boilerPlate(lock, lock._is_owned)
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174
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175 def testWithCondition(self):
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176 lock = threading.Condition()
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177 def locked():
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178 return lock._is_owned()
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179 self.boilerPlate(lock, locked)
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180
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181 def testWithSemaphore(self):
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182 lock = threading.Semaphore()
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183 def locked():
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184 if lock.acquire(False):
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185 lock.release()
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186 return False
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187 else:
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188 return True
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189 self.boilerPlate(lock, locked)
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190
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191 def testWithBoundedSemaphore(self):
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192 lock = threading.BoundedSemaphore()
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193 def locked():
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194 if lock.acquire(False):
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195 lock.release()
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196 return False
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197 else:
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198 return True
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199 self.boilerPlate(lock, locked)
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200
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201 # This is needed to make the test actually run under regrtest.py!
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202 def test_main():
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203 support.run_unittest(__name__)
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204
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205 if __name__ == "__main__":
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206 test_main()