Mercurial > cpython-lru_cache-weakref

annotate Lib/test/test_largefile.py @ 54294:dba767bc3155 legacy-trunk

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remove mention of old ctypes version
author Benjamin Peterson <benjamin@python.org>
date Sat, 23 May 2009 20:59:09 +0000
parents 228cfb6e2900
children 760a710eb6c1
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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parents: 44904
diff changeset
1 """Test largefile support on system where this makes sense.
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parents: 44904
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2 """
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3
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4 import os
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5 import stat
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6 import sys
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7 import unittest
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8 from test.test_support import run_unittest, TESTFN, verbose, requires, \
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9 unlink
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10
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8a8f57dcf9fe Ignore SIGXFSZ. Fixes #490453.
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11 try:
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12 import signal
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13 # The default handler for SIGXFSZ is to abort the process.
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14 # By ignoring it, system calls exceeding the file size resource
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15 # limit will raise IOError instead of crashing the interpreter.
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16 oldhandler = signal.signal(signal.SIGXFSZ, signal.SIG_IGN)
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17 except (ImportError, AttributeError):
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18 pass
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19
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20 # create >2GB file (2GB = 2147483648 bytes)
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21 size = 2500000000L
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22
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23
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24 class TestCase(unittest.TestCase):
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25 """Test that each file function works as expected for a large
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26 (i.e. > 2GB, do we have to check > 4GB) files.
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27
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28 NOTE: the order of execution of the test methods is important! test_seek
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29 must run first to create the test file. File cleanup must also be handled
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30 outside the test instances because of this.
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31
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32 """
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33
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34 def test_seek(self):
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35 if verbose:
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36 print 'create large file via seek (may be sparse file) ...'
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37 with open(TESTFN, 'wb') as f:
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38 f.write('z')
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39 f.seek(0)
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40 f.seek(size)
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41 f.write('a')
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42 f.flush()
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43 if verbose:
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44 print 'check file size with os.fstat'
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45 self.assertEqual(os.fstat(f.fileno())[stat.ST_SIZE], size+1)
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46
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47 def test_osstat(self):
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48 if verbose:
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49 print 'check file size with os.stat'
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50 self.assertEqual(os.stat(TESTFN)[stat.ST_SIZE], size+1)
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51
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52 def test_seek_read(self):
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53 if verbose:
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54 print 'play around with seek() and read() with the built largefile'
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55 with open(TESTFN, 'rb') as f:
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56 self.assertEqual(f.tell(), 0)
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57 self.assertEqual(f.read(1), 'z')
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58 self.assertEqual(f.tell(), 1)
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59 f.seek(0)
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60 self.assertEqual(f.tell(), 0)
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61 f.seek(0, 0)
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62 self.assertEqual(f.tell(), 0)
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63 f.seek(42)
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64 self.assertEqual(f.tell(), 42)
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65 f.seek(42, 0)
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66 self.assertEqual(f.tell(), 42)
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67 f.seek(42, 1)
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68 self.assertEqual(f.tell(), 84)
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69 f.seek(0, 1)
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70 self.assertEqual(f.tell(), 84)
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71 f.seek(0, 2) # seek from the end
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72 self.assertEqual(f.tell(), size + 1 + 0)
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73 f.seek(-10, 2)
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74 self.assertEqual(f.tell(), size + 1 - 10)
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75 f.seek(-size-1, 2)
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76 self.assertEqual(f.tell(), 0)
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77 f.seek(size)
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78 self.assertEqual(f.tell(), size)
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79 # the 'a' that was written at the end of file above
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80 self.assertEqual(f.read(1), 'a')
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81 f.seek(-size-1, 1)
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82 self.assertEqual(f.read(1), 'z')
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83 self.assertEqual(f.tell(), 1)
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84
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85 def test_lseek(self):
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86 if verbose:
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87 print 'play around with os.lseek() with the built largefile'
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88 with open(TESTFN, 'rb') as f:
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89 self.assertEqual(os.lseek(f.fileno(), 0, 0), 0)
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90 self.assertEqual(os.lseek(f.fileno(), 42, 0), 42)
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91 self.assertEqual(os.lseek(f.fileno(), 42, 1), 84)
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92 self.assertEqual(os.lseek(f.fileno(), 0, 1), 84)
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93 self.assertEqual(os.lseek(f.fileno(), 0, 2), size+1+0)
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94 self.assertEqual(os.lseek(f.fileno(), -10, 2), size+1-10)
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95 self.assertEqual(os.lseek(f.fileno(), -size-1, 2), 0)
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96 self.assertEqual(os.lseek(f.fileno(), size, 0), size)
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97 # the 'a' that was written at the end of file above
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98 self.assertEqual(f.read(1), 'a')
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99
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100 def test_truncate(self):
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101 if verbose:
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102 print 'try truncate'
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103 with open(TESTFN, 'r+b') as f:
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104 # this is already decided before start running the test suite
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105 # but we do it anyway for extra protection
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106 if not hasattr(f, 'truncate'):
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107 raise unittest.SkipTest, "open().truncate() not available on this system"
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108 f.seek(0, 2)
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109 # else we've lost track of the true size
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110 self.assertEqual(f.tell(), size+1)
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111 # Cut it back via seek + truncate with no argument.
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112 newsize = size - 10
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113 f.seek(newsize)
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114 f.truncate()
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115 self.assertEqual(f.tell(), newsize) # else pointer moved
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116 f.seek(0, 2)
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117 self.assertEqual(f.tell(), newsize) # else wasn't truncated
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118 # Ensure that truncate(smaller than true size) shrinks
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119 # the file.
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120 newsize -= 1
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121 f.seek(42)
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122 f.truncate(newsize)
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123 self.assertEqual(f.tell(), 42) # else pointer moved
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124 f.seek(0, 2)
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125 self.assertEqual(f.tell(), newsize) # else wasn't truncated
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parents: 44904
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126
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Facundo Batista <facundobatista@gmail.com>
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127 # XXX truncate(larger than true size) is ill-defined
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parents: 44904
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128 # across platform; cut it waaaaay back
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Facundo Batista <facundobatista@gmail.com>
parents: 44904
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129 f.seek(0)
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parents: 44904
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130 f.truncate(1)
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Facundo Batista <facundobatista@gmail.com>
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131 self.assertEqual(f.tell(), 0) # else pointer moved
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Facundo Batista <facundobatista@gmail.com>
parents: 44904
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132 self.assertEqual(len(f.read()), 1) # else wasn't truncated
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Facundo Batista <facundobatista@gmail.com>
parents: 44904
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133
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134
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parents: 45216
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135 def test_main():
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Facundo Batista <facundobatista@gmail.com>
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136 # On Windows and Mac OSX this test comsumes large resources; It
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Facundo Batista <facundobatista@gmail.com>
parents: 44904
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137 # takes a long time to build the >2GB file and takes >2GB of disk
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Facundo Batista <facundobatista@gmail.com>
parents: 44904
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138 # space therefore the resource must be enabled to run this test.
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Facundo Batista <facundobatista@gmail.com>
parents: 44904
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139 # If not, nothing after this line stanza will be executed.
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Facundo Batista <facundobatista@gmail.com>
parents: 44904
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140 if sys.platform[:3] == 'win' or sys.platform == 'darwin':
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Facundo Batista <facundobatista@gmail.com>
parents: 44904
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141 requires('largefile',
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Facundo Batista <facundobatista@gmail.com>
parents: 44904
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142 'test requires %s bytes and a long time to run' % str(size))
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Facundo Batista <facundobatista@gmail.com>
parents: 44904
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143 else:
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Facundo Batista <facundobatista@gmail.com>
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144 # Only run if the current filesystem supports large files.
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145 # (Skip this test on Windows, since we now always support
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Facundo Batista <facundobatista@gmail.com>
parents: 44904
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146 # large files.)
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parents: 44904
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147 f = open(TESTFN, 'wb')
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148 try:
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149 # 2**31 == 2147483648
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150 f.seek(2147483649L)
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Facundo Batista <facundobatista@gmail.com>
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151 # Seeking is not enough of a test: you must write and
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Facundo Batista <facundobatista@gmail.com>
parents: 44904
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152 # flush, too!
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153 f.write("x")
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154 f.flush()
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155 except (IOError, OverflowError):
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156 f.close()
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157 unlink(TESTFN)
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158 raise unittest.SkipTest, "filesystem does not have largefile support"
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Facundo Batista <facundobatista@gmail.com>
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159 else:
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160 f.close()
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161 suite = unittest.TestSuite()
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162 suite.addTest(TestCase('test_seek'))
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163 suite.addTest(TestCase('test_osstat'))
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Facundo Batista <facundobatista@gmail.com>
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164 suite.addTest(TestCase('test_seek_read'))
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Facundo Batista <facundobatista@gmail.com>
parents: 44904
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165 suite.addTest(TestCase('test_lseek'))
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166 with open(TESTFN, 'w') as f:
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167 if hasattr(f, 'truncate'):
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parents: 45216
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168 suite.addTest(TestCase('test_truncate'))
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Facundo Batista <facundobatista@gmail.com>
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169 unlink(TESTFN)
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170 try:
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Brett Cannon <bcannon@gmail.com>
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171 run_unittest(suite)
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Brett Cannon <bcannon@gmail.com>
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172 finally:
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Brett Cannon <bcannon@gmail.com>
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173 unlink(TESTFN)
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174
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Tim Peters <tim.peters@gmail.com>
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175
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Facundo Batista <facundobatista@gmail.com>
parents: 44904
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176 if __name__ == '__main__':
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177 test_main()