Mercurial > cpython-lru_cache-weakref

annotate Lib/test/test_traceback.py @ 79675:c0a2294de787 2.7

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Issue #16199: Backport 2to3 typo fix from 3.2.
author Chris Jerdonek <chris.jerdonek@gmail.com>
date Thu, 11 Oct 2012 16:15:46 -0700
parents b36cb4602e21
children
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 imp import reload
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8 from test.test_support import run_unittest, is_jython, Error
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9
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10 import traceback
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11
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12
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13 class TracebackCases(unittest.TestCase):
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14 # For now, a very minimal set of tests. I want to be sure that
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15 # formatting of SyntaxErrors works based on changes for 2.1.
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16
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17 def get_exception_format(self, func, exc):
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18 try:
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19 func()
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20 except exc, value:
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21 return traceback.format_exception_only(exc, value)
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22 else:
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23 raise ValueError, "call did not raise exception"
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24
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25 def syntax_error_with_caret(self):
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26 compile("def fact(x):\n\treturn x!\n", "?", "exec")
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27
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28 def syntax_error_with_caret_2(self):
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29 compile("1 +\n", "?", "exec")
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30
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31 def syntax_error_without_caret(self):
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32 # XXX why doesn't compile raise the same traceback?
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33 import test.badsyntax_nocaret
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34
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35 def syntax_error_bad_indentation(self):
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36 compile("def spam():\n print 1\n print 2", "?", "exec")
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37
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38 def test_caret(self):
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39 err = self.get_exception_format(self.syntax_error_with_caret,
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40 SyntaxError)
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41 self.assertTrue(len(err) == 4)
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42 self.assertTrue(err[1].strip() == "return x!")
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43 self.assertIn("^", err[2]) # third line has caret
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44 self.assertTrue(err[1].find("!") == err[2].find("^")) # in the right place
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45
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46 err = self.get_exception_format(self.syntax_error_with_caret_2,
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47 SyntaxError)
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48 self.assertIn("^", err[2]) # third line has caret
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49 self.assertTrue(err[2].count('\n') == 1) # and no additional newline
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50 self.assertTrue(err[1].find("+") == err[2].find("^")) # in the right place
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51
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52 def test_nocaret(self):
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53 if is_jython:
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54 # jython adds a caret in this case (why shouldn't it?)
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55 return
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56 err = self.get_exception_format(self.syntax_error_without_caret,
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57 SyntaxError)
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58 self.assertTrue(len(err) == 3)
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59 self.assertTrue(err[1].strip() == "[x for x in x] = x")
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60
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61 def test_bad_indentation(self):
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62 err = self.get_exception_format(self.syntax_error_bad_indentation,
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63 IndentationError)
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64 self.assertTrue(len(err) == 4)
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65 self.assertTrue(err[1].strip() == "print 2")
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66 self.assertIn("^", err[2])
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67 self.assertTrue(err[1].find("2") == err[2].find("^"))
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68
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69 def test_bug737473(self):
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70 import os, tempfile, time
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71
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72 savedpath = sys.path[:]
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73 testdir = tempfile.mkdtemp()
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74 try:
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75 sys.path.insert(0, testdir)
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76 testfile = os.path.join(testdir, 'test_bug737473.py')
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77 print >> open(testfile, 'w'), """
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78 def test():
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79 raise ValueError"""
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80
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81 if 'test_bug737473' in sys.modules:
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82 del sys.modules['test_bug737473']
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83 import test_bug737473
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84
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85 try:
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86 test_bug737473.test()
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87 except ValueError:
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88 # this loads source code to linecache
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89 traceback.extract_tb(sys.exc_traceback)
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90
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91 # If this test runs too quickly, test_bug737473.py's mtime
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92 # attribute will remain unchanged even if the file is rewritten.
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93 # Consequently, the file would not reload. So, added a sleep()
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94 # delay to assure that a new, distinct timestamp is written.
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95 # Since WinME with FAT32 has multisecond resolution, more than
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96 # three seconds are needed for this test to pass reliably :-(
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97 time.sleep(4)
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98
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99 print >> open(testfile, 'w'), """
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100 def test():
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101 raise NotImplementedError"""
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102 reload(test_bug737473)
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103 try:
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104 test_bug737473.test()
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105 except NotImplementedError:
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106 src = traceback.extract_tb(sys.exc_traceback)[-1][-1]
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107 self.assertEqual(src, 'raise NotImplementedError')
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108 finally:
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109 sys.path[:] = savedpath
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110 for f in os.listdir(testdir):
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111 os.unlink(os.path.join(testdir, f))
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112 os.rmdir(testdir)
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113
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114 def test_base_exception(self):
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115 # Test that exceptions derived from BaseException are formatted right
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116 e = KeyboardInterrupt()
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117 lst = traceback.format_exception_only(e.__class__, e)
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118 self.assertEqual(lst, ['KeyboardInterrupt\n'])
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119
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120 # String exceptions are deprecated, but legal. The quirky form with
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121 # separate "type" and "value" tends to break things, because
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122 # not isinstance(value, type)
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123 # and a string cannot be the first argument to issubclass.
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124 #
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125 # Note that sys.last_type and sys.last_value do not get set if an
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126 # exception is caught, so we sort of cheat and just emulate them.
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127 #
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128 # test_string_exception1 is equivalent to
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129 #
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130 # >>> raise "String Exception"
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131 #
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132 # test_string_exception2 is equivalent to
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133 #
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134 # >>> raise "String Exception", "String Value"
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135 #
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136 def test_string_exception1(self):
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137 str_type = "String Exception"
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138 err = traceback.format_exception_only(str_type, None)
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139 self.assertEqual(len(err), 1)
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140 self.assertEqual(err[0], str_type + '\n')
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141
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142 def test_string_exception2(self):
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143 str_type = "String Exception"
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144 str_value = "String Value"
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145 err = traceback.format_exception_only(str_type, str_value)
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146 self.assertEqual(len(err), 1)
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147 self.assertEqual(err[0], str_type + ': ' + str_value + '\n')
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148
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149 def test_format_exception_only_bad__str__(self):
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150 class X(Exception):
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151 def __str__(self):
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152 1 // 0
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153 err = traceback.format_exception_only(X, X())
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154 self.assertEqual(len(err), 1)
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155 str_value = '<unprintable %s object>' % X.__name__
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156 self.assertEqual(err[0], X.__name__ + ': ' + str_value + '\n')
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157
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158 def test_without_exception(self):
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159 err = traceback.format_exception_only(None, None)
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160 self.assertEqual(err, ['None\n'])
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161
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162 def test_unicode(self):
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163 err = AssertionError('\xff')
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164 lines = traceback.format_exception_only(type(err), err)
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165 self.assertEqual(lines, ['AssertionError: \xff\n'])
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166
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167 err = AssertionError(u'\xe9')
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168 lines = traceback.format_exception_only(type(err), err)
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169 self.assertEqual(lines, ['AssertionError: \\xe9\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_format(self):
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175 try:
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176 raise KeyError('blah')
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177 except KeyError:
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178 type_, value, tb = sys.exc_info()
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179 traceback_fmt = 'Traceback (most recent call last):\n' + \
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180 ''.join(traceback.format_tb(tb))
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181 file_ = StringIO()
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182 traceback_print(tb, file_)
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183 python_fmt = file_.getvalue()
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184 else:
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185 raise Error("unable to create test traceback string")
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186
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187 # Make sure that Python and the traceback module format the same thing
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188 self.assertEqual(traceback_fmt, python_fmt)
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189
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190 # Make sure that the traceback is properly indented.
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191 tb_lines = python_fmt.splitlines()
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192 self.assertEqual(len(tb_lines), 3)
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193 banner, location, source_line = tb_lines
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194 self.assertTrue(banner.startswith('Traceback'))
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195 self.assertTrue(location.startswith(' File'))
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196 self.assertTrue(source_line.startswith(' raise'))
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197
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198
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199 def test_main():
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200 run_unittest(TracebackCases, TracebackFormatTests)
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201
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202
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203 if __name__ == "__main__":
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204 test_main()