Mercurial > cpython-lru_cache-weakref

annotate Lib/test/test_traceback.py @ 58925:eecf1bef052d 2.6

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Merged revisions 78207 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r78207 | ezio.melotti | 2010-02-17 01:26:09 +0200 (Wed, 17 Feb 2010) | 1 line #7930: fix stripid ........
author Ezio Melotti <ezio.melotti@gmail.com>
date Tue, 16 Feb 2010 23:29:44 +0000
parents 97d7cd365dd5
children 4380e04343ee
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 """Test cases for traceback module"""
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2
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3 from _testcapi import traceback_print
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4 from StringIO import StringIO
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5 import sys
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6 import unittest
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7 from test.test_support import run_unittest, is_jython, Error
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8
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9 import traceback
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10
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11 try:
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12 raise KeyError
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13 except KeyError:
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14 type_, value, tb = sys.exc_info()
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15 file_ = StringIO()
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16 traceback_print(tb, file_)
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17 example_traceback = file_.getvalue()
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18 else:
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19 raise Error("unable to create test traceback string")
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20
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21
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22 class TracebackCases(unittest.TestCase):
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23 # For now, a very minimal set of tests. I want to be sure that
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24 # formatting of SyntaxErrors works based on changes for 2.1.
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25
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26 def get_exception_format(self, func, exc):
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27 try:
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28 func()
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29 except exc, value:
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30 return traceback.format_exception_only(exc, value)
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31 else:
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32 raise ValueError, "call did not raise exception"
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33
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34 def syntax_error_with_caret(self):
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35 compile("def fact(x):\n\treturn x!\n", "?", "exec")
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36
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37 def syntax_error_with_caret_2(self):
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38 compile("1 +\n", "?", "exec")
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39
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40 def syntax_error_without_caret(self):
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41 # XXX why doesn't compile raise the same traceback?
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42 import test.badsyntax_nocaret
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43
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44 def syntax_error_bad_indentation(self):
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45 compile("def spam():\n print 1\n print 2", "?", "exec")
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46
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47 def test_caret(self):
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48 err = self.get_exception_format(self.syntax_error_with_caret,
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49 SyntaxError)
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50 self.assert_(len(err) == 4)
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51 self.assert_(err[1].strip() == "return x!")
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52 self.assert_("^" in err[2]) # third line has caret
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53 self.assert_(err[1].find("!") == err[2].find("^")) # in the right place
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54
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55 err = self.get_exception_format(self.syntax_error_with_caret_2,
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56 SyntaxError)
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57 self.assert_("^" in err[2]) # third line has caret
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58 self.assert_(err[2].count('\n') == 1) # and no additional newline
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59 self.assert_(err[1].find("+") == err[2].find("^")) # in the right place
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60
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61 def test_nocaret(self):
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62 if is_jython:
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63 # jython adds a caret in this case (why shouldn't it?)
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64 return
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65 err = self.get_exception_format(self.syntax_error_without_caret,
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66 SyntaxError)
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67 self.assert_(len(err) == 3)
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68 self.assert_(err[1].strip() == "[x for x in x] = x")
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69
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70 def test_bad_indentation(self):
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71 err = self.get_exception_format(self.syntax_error_bad_indentation,
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72 IndentationError)
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73 self.assert_(len(err) == 4)
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74 self.assert_(err[1].strip() == "print 2")
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75 self.assert_("^" in err[2])
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76 self.assert_(err[1].find("2") == err[2].find("^"))
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77
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78 def test_bug737473(self):
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79 import sys, os, tempfile, time
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80
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81 savedpath = sys.path[:]
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82 testdir = tempfile.mkdtemp()
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83 try:
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84 sys.path.insert(0, testdir)
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85 testfile = os.path.join(testdir, 'test_bug737473.py')
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86 print >> open(testfile, 'w'), """
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87 def test():
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88 raise ValueError"""
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89
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90 if 'test_bug737473' in sys.modules:
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91 del sys.modules['test_bug737473']
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92 import test_bug737473
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93
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94 try:
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95 test_bug737473.test()
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96 except ValueError:
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97 # this loads source code to linecache
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98 traceback.extract_tb(sys.exc_traceback)
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99
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100 # If this test runs too quickly, test_bug737473.py's mtime
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101 # attribute will remain unchanged even if the file is rewritten.
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102 # Consequently, the file would not reload. So, added a sleep()
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103 # delay to assure that a new, distinct timestamp is written.
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104 # Since WinME with FAT32 has multisecond resolution, more than
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105 # three seconds are needed for this test to pass reliably :-(
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106 time.sleep(4)
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107
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108 print >> open(testfile, 'w'), """
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109 def test():
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110 raise NotImplementedError"""
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111 reload(test_bug737473)
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112 try:
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113 test_bug737473.test()
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114 except NotImplementedError:
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115 src = traceback.extract_tb(sys.exc_traceback)[-1][-1]
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116 self.failUnlessEqual(src, 'raise NotImplementedError')
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117 finally:
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118 sys.path[:] = savedpath
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119 for f in os.listdir(testdir):
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120 os.unlink(os.path.join(testdir, f))
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121 os.rmdir(testdir)
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122
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123 def test_base_exception(self):
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124 # Test that exceptions derived from BaseException are formatted right
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125 e = KeyboardInterrupt()
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126 lst = traceback.format_exception_only(e.__class__, e)
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127 self.assertEqual(lst, ['KeyboardInterrupt\n'])
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128
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129 # String exceptions are deprecated, but legal. The quirky form with
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130 # separate "type" and "value" tends to break things, because
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131 # not isinstance(value, type)
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132 # and a string cannot be the first argument to issubclass.
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133 #
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134 # Note that sys.last_type and sys.last_value do not get set if an
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135 # exception is caught, so we sort of cheat and just emulate them.
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136 #
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137 # test_string_exception1 is equivalent to
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138 #
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139 # >>> raise "String Exception"
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140 #
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141 # test_string_exception2 is equivalent to
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142 #
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143 # >>> raise "String Exception", "String Value"
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144 #
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145 def test_string_exception1(self):
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146 str_type = "String Exception"
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147 err = traceback.format_exception_only(str_type, None)
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148 self.assertEqual(len(err), 1)
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149 self.assertEqual(err[0], str_type + '\n')
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150
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151 def test_string_exception2(self):
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152 str_type = "String Exception"
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153 str_value = "String Value"
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154 err = traceback.format_exception_only(str_type, str_value)
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155 self.assertEqual(len(err), 1)
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156 self.assertEqual(err[0], str_type + ': ' + str_value + '\n')
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157
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158 def test_format_exception_only_bad__str__(self):
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159 class X(Exception):
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160 def __str__(self):
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161 1/0
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162 err = traceback.format_exception_only(X, X())
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163 self.assertEqual(len(err), 1)
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164 str_value = '<unprintable %s object>' % X.__name__
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165 self.assertEqual(err[0], X.__name__ + ': ' + str_value + '\n')
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166
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167 def test_without_exception(self):
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168 err = traceback.format_exception_only(None, None)
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169 self.assertEqual(err, ['None\n'])
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170
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171
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172 class TracebackFormatTests(unittest.TestCase):
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173
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174 def test_traceback_indentation(self):
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175 # Make sure that the traceback is properly indented.
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176 tb_lines = example_traceback.splitlines()
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177 self.assertEquals(len(tb_lines), 3)
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178 banner, location, source_line = tb_lines
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179 self.assert_(banner.startswith('Traceback'))
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180 self.assert_(location.startswith(' File'))
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181 self.assert_(source_line.startswith(' raise'))
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182
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183
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184 def test_main():
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185 run_unittest(TracebackCases, TracebackFormatTests)
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186
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187
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188 if __name__ == "__main__":
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189 test_main()