Mercurial > cpython-lru_cache-weakref

annotate Lib/lib2to3/tests/test_parser.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 fab380674959
children 5b679c249e3c
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
58737
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1 """Test suite for 2to3's parser and grammar files.
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2
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3 This is the place to add tests for changes to 2to3's grammar, such as those
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4 merging the grammars for Python 2 and 3. In addition to specific tests for
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5 parts of the grammar we've changed, we also make sure we can parse the
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6 test_grammar.py files from both Python 2 and Python 3.
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7 """
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8
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9 # Testing imports
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10 from . import support
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11 from .support import driver, test_dir
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12
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13 # Python imports
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14 import os
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15 import io
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16 import sys
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17
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18 # Local imports
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19 from lib2to3.pgen2 import tokenize
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20 from ..pgen2.parse import ParseError
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21
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22
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23 class GrammarTest(support.TestCase):
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24 def validate(self, code):
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25 support.parse_string(code)
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26
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27 def invalid_syntax(self, code):
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28 try:
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29 self.validate(code)
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30 except ParseError:
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31 pass
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32 else:
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33 raise AssertionError("Syntax shouldn't have been valid")
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34
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35
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36 class TestRaiseChanges(GrammarTest):
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37 def test_2x_style_1(self):
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38 self.validate("raise")
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39
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40 def test_2x_style_2(self):
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41 self.validate("raise E, V")
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42
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43 def test_2x_style_3(self):
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44 self.validate("raise E, V, T")
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45
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46 def test_2x_style_invalid_1(self):
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47 self.invalid_syntax("raise E, V, T, Z")
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48
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49 def test_3x_style(self):
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50 self.validate("raise E1 from E2")
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51
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52 def test_3x_style_invalid_1(self):
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53 self.invalid_syntax("raise E, V from E1")
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54
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55 def test_3x_style_invalid_2(self):
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56 self.invalid_syntax("raise E from E1, E2")
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57
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58 def test_3x_style_invalid_3(self):
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59 self.invalid_syntax("raise from E1, E2")
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60
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61 def test_3x_style_invalid_4(self):
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62 self.invalid_syntax("raise E from")
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63
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64
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65 # Adapated from Python 3's Lib/test/test_grammar.py:GrammarTests.testFuncdef
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66 class TestFunctionAnnotations(GrammarTest):
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67 def test_1(self):
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68 self.validate("""def f(x) -> list: pass""")
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69
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70 def test_2(self):
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71 self.validate("""def f(x:int): pass""")
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72
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73 def test_3(self):
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74 self.validate("""def f(*x:str): pass""")
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75
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76 def test_4(self):
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77 self.validate("""def f(**x:float): pass""")
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78
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79 def test_5(self):
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80 self.validate("""def f(x, y:1+2): pass""")
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81
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82 def test_6(self):
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83 self.validate("""def f(a, (b:1, c:2, d)): pass""")
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84
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85 def test_7(self):
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86 self.validate("""def f(a, (b:1, c:2, d), e:3=4, f=5, *g:6): pass""")
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87
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88 def test_8(self):
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89 s = """def f(a, (b:1, c:2, d), e:3=4, f=5,
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90 *g:6, h:7, i=8, j:9=10, **k:11) -> 12: pass"""
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91 self.validate(s)
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92
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93
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94 class TestExcept(GrammarTest):
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95 def test_new(self):
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96 s = """
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97 try:
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98 x
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99 except E as N:
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100 y"""
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101 self.validate(s)
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102
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103 def test_old(self):
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104 s = """
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105 try:
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106 x
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107 except E, N:
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108 y"""
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109 self.validate(s)
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110
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111
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112 # Adapted from Python 3's Lib/test/test_grammar.py:GrammarTests.testAtoms
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113 class TestSetLiteral(GrammarTest):
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114 def test_1(self):
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115 self.validate("""x = {'one'}""")
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116
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117 def test_2(self):
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118 self.validate("""x = {'one', 1,}""")
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119
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120 def test_3(self):
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121 self.validate("""x = {'one', 'two', 'three'}""")
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122
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123 def test_4(self):
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124 self.validate("""x = {2, 3, 4,}""")
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125
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126
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127 class TestNumericLiterals(GrammarTest):
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128 def test_new_octal_notation(self):
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129 self.validate("""0o7777777777777""")
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130 self.invalid_syntax("""0o7324528887""")
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131
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132 def test_new_binary_notation(self):
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133 self.validate("""0b101010""")
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134 self.invalid_syntax("""0b0101021""")
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135
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136
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137 class TestClassDef(GrammarTest):
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138 def test_new_syntax(self):
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139 self.validate("class B(t=7): pass")
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140 self.validate("class B(t, *args): pass")
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141 self.validate("class B(t, **kwargs): pass")
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142 self.validate("class B(t, *args, **kwargs): pass")
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143 self.validate("class B(t, y=9, *args, **kwargs): pass")
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144
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145
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146 class TestParserIdempotency(support.TestCase):
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147
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148 """A cut-down version of pytree_idempotency.py."""
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149
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150 def test_all_project_files(self):
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151 if sys.platform.startswith("win"):
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152 # XXX something with newlines goes wrong on Windows.
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153 return
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154 for filepath in support.all_project_files():
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155 with open(filepath, "rb") as fp:
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156 encoding = tokenize.detect_encoding(fp.readline)[0]
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157 self.assertTrue(encoding is not None,
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158 "can't detect encoding for %s" % filepath)
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159 with io.open(filepath, "r", encoding=encoding) as fp:
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160 source = fp.read()
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161 tree = driver.parse_string(source)
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162 new = unicode(tree)
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163 if diff(filepath, new, encoding):
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164 self.fail("Idempotency failed: %s" % filepath)
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165
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166 def test_extended_unpacking(self):
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167 driver.parse_string("a, *b, c = x\n")
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168 driver.parse_string("[*a, b] = x\n")
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169 driver.parse_string("(z, *y, w) = m\n")
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170 driver.parse_string("for *z, m in d: pass\n")
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171
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172 class TestLiterals(GrammarTest):
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173
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174 def validate(self, s):
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175 driver.parse_string(support.dedent(s) + "\n\n")
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176
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177 def test_multiline_bytes_literals(self):
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178 s = """
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179 md5test(b"\xaa" * 80,
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180 (b"Test Using Larger Than Block-Size Key "
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181 b"and Larger Than One Block-Size Data"),
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182 "6f630fad67cda0ee1fb1f562db3aa53e")
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183 """
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184 self.validate(s)
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185
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186 def test_multiline_bytes_tripquote_literals(self):
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187 s = '''
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188 b"""
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189 <?xml version="1.0" encoding="UTF-8"?>
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190 <!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN">
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191 """
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192 '''
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193 self.validate(s)
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194
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195 def test_multiline_str_literals(self):
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196 s = """
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197 md5test("\xaa" * 80,
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198 ("Test Using Larger Than Block-Size Key "
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199 "and Larger Than One Block-Size Data"),
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200 "6f630fad67cda0ee1fb1f562db3aa53e")
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201 """
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202 self.validate(s)
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203
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204
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205 def diff(fn, result, encoding):
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206 f = io.open("@", "w", encoding=encoding)
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207 try:
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208 f.write(result)
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209 finally:
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210 f.close()
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211 try:
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212 return os.system("diff -u %r @" % fn)
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213 finally:
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214 os.remove("@")