Mercurial > cpython-lru_cache-weakref

annotate Lib/test/test_StringIO.py @ 58765:2ba7677bfa95 legacy-trunk

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testCopysign was defined twice in test_math; combine the definitions
author Mark Dickinson <dickinsm@gmail.com>
date Sat, 06 Feb 2010 23:11:25 +0000
parents 0dd1aa33265f
children c8c840162804
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 from test import test_support
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8
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9
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10 class TestGenericStringIO(unittest.TestCase):
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11 # use a class variable MODULE to define which module is being tested
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12
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13 # Line of data to test as string
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14 _line = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ!'
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15
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16 # Constructor to use for the test data (._line is passed to this
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17 # constructor)
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18 constructor = str
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19
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20 def setUp(self):
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21 self._line = self.constructor(self._line)
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22 self._lines = self.constructor((self._line + '\n') * 5)
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23 self._fp = self.MODULE.StringIO(self._lines)
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24
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25 def test_reads(self):
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26 eq = self.assertEqual
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27 self.assertRaises(TypeError, self._fp.seek)
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28 eq(self._fp.read(10), self._line[:10])
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29 eq(self._fp.readline(), self._line[10:] + '\n')
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30 eq(len(self._fp.readlines(60)), 2)
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31 self._fp.seek(0)
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32 eq(self._fp.readline(-1), self._line + '\n')
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33
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34 def test_writes(self):
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35 f = self.MODULE.StringIO()
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36 self.assertRaises(TypeError, f.seek)
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37 f.write(self._line[:6])
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38 f.seek(3)
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39 f.write(self._line[20:26])
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40 f.write(self._line[52])
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41 self.assertEqual(f.getvalue(), 'abcuvwxyz!')
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42
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43 def test_writelines(self):
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44 f = self.MODULE.StringIO()
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45 f.writelines([self._line[0], self._line[1], self._line[2]])
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46 f.seek(0)
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47 self.assertEqual(f.getvalue(), 'abc')
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48
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49 def test_writelines_error(self):
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50 def errorGen():
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51 yield 'a'
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52 raise KeyboardInterrupt()
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53 f = self.MODULE.StringIO()
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54 self.assertRaises(KeyboardInterrupt, f.writelines, errorGen())
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55
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56 def test_truncate(self):
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57 eq = self.assertEqual
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58 f = self.MODULE.StringIO()
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59 f.write(self._lines)
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60 f.seek(10)
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61 f.truncate()
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62 eq(f.getvalue(), 'abcdefghij')
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63 f.truncate(5)
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64 eq(f.getvalue(), 'abcde')
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65 f.write('xyz')
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66 eq(f.getvalue(), 'abcdexyz')
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67 self.assertRaises(IOError, f.truncate, -1)
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68 f.close()
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69 self.assertRaises(ValueError, f.write, 'frobnitz')
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70
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71 def test_closed_flag(self):
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72 f = self.MODULE.StringIO()
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73 self.assertEqual(f.closed, False)
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74 f.close()
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75 self.assertEqual(f.closed, True)
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76 f = self.MODULE.StringIO("abc")
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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
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81 def test_isatty(self):
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82 f = self.MODULE.StringIO()
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83 self.assertRaises(TypeError, f.isatty, None)
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84 self.assertEqual(f.isatty(), False)
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85 f.close()
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86 self.assertRaises(ValueError, f.isatty)
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87
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88 def test_iterator(self):
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89 eq = self.assertEqual
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90 unless = self.assertTrue
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91 eq(iter(self._fp), self._fp)
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92 # Does this object support the iteration protocol?
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93 unless(hasattr(self._fp, '__iter__'))
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94 unless(hasattr(self._fp, 'next'))
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95 i = 0
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96 for line in self._fp:
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97 eq(line, self._line + '\n')
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98 i += 1
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99 eq(i, 5)
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100 self._fp.close()
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101 self.assertRaises(ValueError, self._fp.next)
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102
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103 class TestStringIO(TestGenericStringIO):
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104 MODULE = StringIO
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105
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106 def test_unicode(self):
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107
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108 if not test_support.have_unicode: return
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109
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110 # The StringIO module also supports concatenating Unicode
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111 # snippets to larger Unicode strings. This is tested by this
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112 # method. Note that cStringIO does not support this extension.
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113
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114 f = self.MODULE.StringIO()
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115 f.write(self._line[:6])
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116 f.seek(3)
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117 f.write(unicode(self._line[20:26]))
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118 f.write(unicode(self._line[52]))
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119 s = f.getvalue()
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120 self.assertEqual(s, unicode('abcuvwxyz!'))
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121 self.assertEqual(type(s), types.UnicodeType)
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122
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123 class TestcStringIO(TestGenericStringIO):
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124 MODULE = cStringIO
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125
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126 import sys
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127 if sys.platform.startswith('java'):
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128 # Jython doesn't have a buffer object, so we just do a useless
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129 # fake of the buffer tests.
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130 buffer = str
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131
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132 class TestBufferStringIO(TestStringIO):
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133 constructor = buffer
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134
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135 class TestBuffercStringIO(TestcStringIO):
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136 constructor = buffer
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137
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138
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139 def test_main():
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140 test_support.run_unittest(
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141 TestStringIO,
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142 TestcStringIO,
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143 TestBufferStringIO,
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144 TestBuffercStringIO
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145 )
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146
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147 if __name__ == '__main__':
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148 test_main()