Mercurial > cpython-lru_cache-weakref

annotate Lib/test/test_StringIO.py @ 80661:94de77bd0b4b 2.7

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Issue #16194: document imp.load_dynamic problems when read several extension modules from the same binary object file.
author Andrew Svetlov <andrew.svetlov@gmail.com>
date Thu, 29 Nov 2012 19:51:28 +0200
parents 27ae7d4e1983
children a025b04332fe
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
14688
d6ffb6d7fe8a New test cases for the StringIO module
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1 # Tests StringIO and cStringIO
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2
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3 import unittest
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4 import StringIO
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5 import cStringIO
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6 import types
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7 import array
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8 from test import test_support
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9
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10
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11 class TestGenericStringIO(unittest.TestCase):
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12 # use a class variable MODULE to define which module is being tested
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13
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14 # Line of data to test as string
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15 _line = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ!'
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16
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17 # Constructor to use for the test data (._line is passed to this
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18 # constructor)
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19 constructor = str
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20
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21 def setUp(self):
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22 self._line = self.constructor(self._line)
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23 self._lines = self.constructor((self._line + '\n') * 5)
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24 self._fp = self.MODULE.StringIO(self._lines)
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25
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26 def test_reads(self):
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27 eq = self.assertEqual
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28 self.assertRaises(TypeError, self._fp.seek)
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29 eq(self._fp.read(10), self._line[:10])
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30 eq(self._fp.readline(), self._line[10:] + '\n')
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31 eq(len(self._fp.readlines(60)), 2)
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32 self._fp.seek(0)
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33 eq(self._fp.readline(-1), self._line + '\n')
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34
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35 def test_writes(self):
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36 f = self.MODULE.StringIO()
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37 self.assertRaises(TypeError, f.seek)
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38 f.write(self._line[:6])
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39 f.seek(3)
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40 f.write(self._line[20:26])
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41 f.write(self._line[52])
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42 self.assertEqual(f.getvalue(), 'abcuvwxyz!')
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43
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44 def test_writelines(self):
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45 f = self.MODULE.StringIO()
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46 f.writelines([self._line[0], self._line[1], self._line[2]])
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47 f.seek(0)
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48 self.assertEqual(f.getvalue(), 'abc')
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49
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50 def test_writelines_error(self):
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51 def errorGen():
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52 yield 'a'
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53 raise KeyboardInterrupt()
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54 f = self.MODULE.StringIO()
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55 self.assertRaises(KeyboardInterrupt, f.writelines, errorGen())
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56
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57 def test_truncate(self):
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58 eq = self.assertEqual
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59 f = self.MODULE.StringIO()
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60 f.write(self._lines)
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61 f.seek(10)
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62 f.truncate()
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63 eq(f.getvalue(), 'abcdefghij')
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64 f.truncate(5)
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65 eq(f.getvalue(), 'abcde')
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66 f.write('xyz')
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67 eq(f.getvalue(), 'abcdexyz')
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68 self.assertRaises(IOError, f.truncate, -1)
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69 f.close()
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70 self.assertRaises(ValueError, f.write, 'frobnitz')
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71
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72 def test_closed_flag(self):
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73 f = self.MODULE.StringIO()
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74 self.assertEqual(f.closed, False)
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75 f.close()
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76 self.assertEqual(f.closed, True)
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77 f = self.MODULE.StringIO("abc")
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78 self.assertEqual(f.closed, False)
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79 f.close()
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80 self.assertEqual(f.closed, True)
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81
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82 def test_isatty(self):
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83 f = self.MODULE.StringIO()
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84 self.assertRaises(TypeError, f.isatty, None)
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85 self.assertEqual(f.isatty(), False)
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86 f.close()
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87 self.assertRaises(ValueError, f.isatty)
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88
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89 def test_iterator(self):
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90 eq = self.assertEqual
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91 unless = self.assertTrue
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92 eq(iter(self._fp), self._fp)
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93 # Does this object support the iteration protocol?
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94 unless(hasattr(self._fp, '__iter__'))
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95 unless(hasattr(self._fp, 'next'))
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96 i = 0
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97 for line in self._fp:
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98 eq(line, self._line + '\n')
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99 i += 1
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100 eq(i, 5)
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101 self._fp.close()
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102 self.assertRaises(ValueError, self._fp.next)
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103
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104 def test_getvalue(self):
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105 self._fp.close()
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106 self.assertRaises(ValueError, self._fp.getvalue)
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107
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108 class TestStringIO(TestGenericStringIO):
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109 MODULE = StringIO
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110
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111 def test_unicode(self):
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112
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113 if not test_support.have_unicode: return
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114
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115 # The StringIO module also supports concatenating Unicode
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116 # snippets to larger Unicode strings. This is tested by this
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117 # method. Note that cStringIO does not support this extension.
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118
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119 f = self.MODULE.StringIO()
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120 f.write(self._line[:6])
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121 f.seek(3)
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122 f.write(unicode(self._line[20:26]))
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123 f.write(unicode(self._line[52]))
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124 s = f.getvalue()
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125 self.assertEqual(s, unicode('abcuvwxyz!'))
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126 self.assertEqual(type(s), types.UnicodeType)
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127
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128 class TestcStringIO(TestGenericStringIO):
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129 MODULE = cStringIO
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130
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131 def test_array_support(self):
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132 # Issue #1730114: cStringIO should accept array objects
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133 a = array.array('B', [0,1,2])
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134 f = self.MODULE.StringIO(a)
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135 self.assertEqual(f.getvalue(), '\x00\x01\x02')
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136
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137 def test_unicode(self):
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138
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139 if not test_support.have_unicode: return
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140
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141 # The cStringIO module converts Unicode strings to character
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142 # strings when writing them to cStringIO objects.
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143 # Check that this works.
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144
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145 f = self.MODULE.StringIO()
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146 f.write(u'abcde')
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147 s = f.getvalue()
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148 self.assertEqual(s, 'abcde')
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149 self.assertEqual(type(s), str)
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150
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151 f = self.MODULE.StringIO(u'abcde')
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152 s = f.getvalue()
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153 self.assertEqual(s, 'abcde')
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154 self.assertEqual(type(s), str)
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155
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156 self.assertRaises(UnicodeEncodeError, self.MODULE.StringIO, u'\xf4')
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157
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158
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159 import sys
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160 if sys.platform.startswith('java'):
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161 # Jython doesn't have a buffer object, so we just do a useless
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162 # fake of the buffer tests.
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163 buffer = str
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164
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165 class TestBufferStringIO(TestStringIO):
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166 constructor = buffer
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167
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168 class TestBuffercStringIO(TestcStringIO):
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169 constructor = buffer
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170
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171
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172 def test_main():
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173 test_support.run_unittest(TestStringIO, TestcStringIO)
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174 with test_support.check_py3k_warnings(("buffer.. not supported",
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175 DeprecationWarning)):
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176 test_support.run_unittest(TestBufferStringIO, TestBuffercStringIO)
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177
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178 if __name__ == '__main__':
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179 test_main()