Mercurial > cpython-lru_cache-weakref

annotate Lib/test/test_StringIO.py @ 82251:bb5a8564e186 2.7

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Issue #13153: Tkinter functions now raise TclError instead of ValueError when a unicode argument contains non-BMP character.
author Serhiy Storchaka <storchaka@gmail.com>
date Mon, 18 Feb 2013 13:00:08 +0200
parents 7513bd184a01
children be4bec689de3
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
14688
d6ffb6d7fe8a New test cases for the StringIO module
Martin v. Löwis <martin@v.loewis.de>
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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 import sys
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9 from test import test_support
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10
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11
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12 class TestGenericStringIO(unittest.TestCase):
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13 # use a class variable MODULE to define which module is being tested
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14
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15 # Line of data to test as string
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16 _line = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ!'
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17
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18 # Constructor to use for the test data (._line is passed to this
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19 # constructor)
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20 constructor = str
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21
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22 def setUp(self):
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23 self._line = self.constructor(self._line)
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24 self._lines = self.constructor((self._line + '\n') * 5)
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25 self._fp = self.MODULE.StringIO(self._lines)
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26
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27 def test_reads(self):
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28 eq = self.assertEqual
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29 self.assertRaises(TypeError, self._fp.seek)
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30 eq(self._fp.read(10), self._line[:10])
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31 eq(self._fp.read(0), '')
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32 eq(self._fp.readline(0), '')
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33 eq(self._fp.readline(), self._line[10:] + '\n')
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34 eq(len(self._fp.readlines(60)), 2)
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35 self._fp.seek(0)
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36 eq(self._fp.readline(-1), self._line + '\n')
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37
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38 def test_writes(self):
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39 f = self.MODULE.StringIO()
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40 self.assertRaises(TypeError, f.seek)
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41 f.write(self._line[:6])
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42 f.seek(3)
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43 f.write(self._line[20:26])
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44 f.write(self._line[52])
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45 self.assertEqual(f.getvalue(), 'abcuvwxyz!')
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46
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47 def test_writelines(self):
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48 f = self.MODULE.StringIO()
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49 f.writelines([self._line[0], self._line[1], self._line[2]])
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50 f.seek(0)
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51 self.assertEqual(f.getvalue(), 'abc')
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52
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53 def test_writelines_error(self):
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54 def errorGen():
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55 yield 'a'
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56 raise KeyboardInterrupt()
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57 f = self.MODULE.StringIO()
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58 self.assertRaises(KeyboardInterrupt, f.writelines, errorGen())
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59
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60 def test_truncate(self):
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61 eq = self.assertEqual
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62 f = self.MODULE.StringIO()
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63 f.write(self._lines)
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64 f.seek(10)
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65 f.truncate()
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66 eq(f.getvalue(), 'abcdefghij')
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67 f.truncate(5)
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68 eq(f.getvalue(), 'abcde')
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69 f.write('xyz')
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70 eq(f.getvalue(), 'abcdexyz')
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71 self.assertRaises(IOError, f.truncate, -1)
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72 f.close()
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73 self.assertRaises(ValueError, f.write, 'frobnitz')
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74
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75 def test_closed_flag(self):
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76 f = self.MODULE.StringIO()
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77 self.assertEqual(f.closed, False)
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78 f.close()
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79 self.assertEqual(f.closed, True)
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80 f = self.MODULE.StringIO("abc")
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81 self.assertEqual(f.closed, False)
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82 f.close()
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83 self.assertEqual(f.closed, True)
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84
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85 def test_isatty(self):
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86 f = self.MODULE.StringIO()
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87 self.assertRaises(TypeError, f.isatty, None)
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88 self.assertEqual(f.isatty(), False)
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89 f.close()
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90 self.assertRaises(ValueError, f.isatty)
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91
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92 def test_iterator(self):
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93 eq = self.assertEqual
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94 unless = self.assertTrue
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95 eq(iter(self._fp), self._fp)
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96 # Does this object support the iteration protocol?
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97 unless(hasattr(self._fp, '__iter__'))
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98 unless(hasattr(self._fp, 'next'))
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99 i = 0
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100 for line in self._fp:
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101 eq(line, self._line + '\n')
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102 i += 1
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103 eq(i, 5)
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104 self._fp.close()
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105 self.assertRaises(ValueError, self._fp.next)
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106
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107 def test_getvalue(self):
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108 self._fp.close()
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109 self.assertRaises(ValueError, self._fp.getvalue)
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110
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111 @test_support.bigmemtest(test_support._2G + 2**26, memuse=2.001)
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112 def test_reads_from_large_stream(self, size):
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113 linesize = 2**26 # 64 MiB
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114 lines = ['x' * (linesize - 1) + '\n'] * (size // linesize) + \
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115 ['y' * (size % linesize)]
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116 f = self.MODULE.StringIO(''.join(lines))
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117 for i, expected in enumerate(lines):
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118 line = f.read(len(expected))
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119 self.assertEqual(len(line), len(expected))
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120 self.assertEqual(line, expected)
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121 self.assertEqual(f.read(), '')
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122 f.seek(0)
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123 for i, expected in enumerate(lines):
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124 line = f.readline()
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125 self.assertEqual(len(line), len(expected))
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126 self.assertEqual(line, expected)
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127 self.assertEqual(f.readline(), '')
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128 f.seek(0)
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129 self.assertEqual(f.readlines(), lines)
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130 self.assertEqual(f.readlines(), [])
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131 f.seek(0)
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132 self.assertEqual(f.readlines(size), lines)
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133 self.assertEqual(f.readlines(), [])
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134
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135 # In worst case cStringIO requires 2 + 1 + 1/2 + 1/2**2 + ... = 4
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136 # bytes per input character.
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137 @test_support.bigmemtest(test_support._2G, memuse=4)
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138 def test_writes_to_large_stream(self, size):
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139 s = 'x' * 2**26 # 64 MiB
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140 f = self.MODULE.StringIO()
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141 n = size
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142 while n > len(s):
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143 f.write(s)
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144 n -= len(s)
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145 s = None
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146 f.write('x' * n)
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147 self.assertEqual(len(f.getvalue()), size)
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148
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149
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150 class TestStringIO(TestGenericStringIO):
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151 MODULE = StringIO
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152
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153 def test_unicode(self):
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154
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155 if not test_support.have_unicode: return
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156
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157 # The StringIO module also supports concatenating Unicode
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158 # snippets to larger Unicode strings. This is tested by this
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159 # method. Note that cStringIO does not support this extension.
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160
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161 f = self.MODULE.StringIO()
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162 f.write(self._line[:6])
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163 f.seek(3)
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164 f.write(unicode(self._line[20:26]))
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165 f.write(unicode(self._line[52]))
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166 s = f.getvalue()
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167 self.assertEqual(s, unicode('abcuvwxyz!'))
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168 self.assertEqual(type(s), types.UnicodeType)
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169
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170 class TestcStringIO(TestGenericStringIO):
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171 MODULE = cStringIO
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172
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173 def test_array_support(self):
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174 # Issue #1730114: cStringIO should accept array objects
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175 a = array.array('B', [0,1,2])
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176 f = self.MODULE.StringIO(a)
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177 self.assertEqual(f.getvalue(), '\x00\x01\x02')
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178
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179 def test_unicode(self):
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180
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181 if not test_support.have_unicode: return
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182
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183 # The cStringIO module converts Unicode strings to character
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184 # strings when writing them to cStringIO objects.
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185 # Check that this works.
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186
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187 f = self.MODULE.StringIO()
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188 f.write(u'abcde')
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189 s = f.getvalue()
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190 self.assertEqual(s, 'abcde')
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191 self.assertEqual(type(s), str)
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192
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193 f = self.MODULE.StringIO(u'abcde')
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194 s = f.getvalue()
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195 self.assertEqual(s, 'abcde')
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196 self.assertEqual(type(s), str)
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197
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198 self.assertRaises(UnicodeEncodeError, self.MODULE.StringIO, u'\xf4')
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199
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200
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201 import sys
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202 if sys.platform.startswith('java'):
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203 # Jython doesn't have a buffer object, so we just do a useless
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204 # fake of the buffer tests.
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205 buffer = str
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206
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207 class TestBufferStringIO(TestStringIO):
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208 constructor = buffer
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209
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210 class TestBuffercStringIO(TestcStringIO):
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211 constructor = buffer
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212
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213
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214 def test_main():
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215 test_support.run_unittest(TestStringIO, TestcStringIO)
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216 with test_support.check_py3k_warnings(("buffer.. not supported",
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217 DeprecationWarning)):
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218 test_support.run_unittest(TestBufferStringIO, TestBuffercStringIO)
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219
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220 if __name__ == '__main__':
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221 test_main()