Mercurial > cpython-lru_cache-weakref
annotate Lib/test/test_largefile.py @ 78069:a8aa77458e12 3.2
Add c_size_t and c_ssize_t to the ctypes summary table.
| author | Antoine Pitrou <solipsis@pitrou.net> |
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| date | Thu, 12 Jul 2012 20:31:50 +0200 |
| parents | 311db7a68a82 |
| children | dd75dbed1135 7d69d04522e3 |
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1 """Test largefile support on system where this makes sense. |
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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.support import run_unittest, TESTFN, verbose, requires, \ |
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9 unlink |
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10 import io # C implementation of io |
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11 import _pyio as pyio # Python implementation of io |
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12 |
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13 try: |
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14 import signal |
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15 # The default handler for SIGXFSZ is to abort the process. |
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16 # By ignoring it, system calls exceeding the file size resource |
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17 # limit will raise IOError instead of crashing the interpreter. |
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18 oldhandler = signal.signal(signal.SIGXFSZ, signal.SIG_IGN) |
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19 except (ImportError, AttributeError): |
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20 pass |
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21 |
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22 # create >2GB file (2GB = 2147483648 bytes) |
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23 size = 2500000000 |
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24 |
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26 class LargeFileTest(unittest.TestCase): |
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27 """Test that each file function works as expected for a large |
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28 (i.e. > 2GB, do we have to check > 4GB) files. |
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29 |
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30 NOTE: the order of execution of the test methods is important! test_seek |
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31 must run first to create the test file. File cleanup must also be handled |
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32 outside the test instances because of this. |
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33 |
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34 """ |
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35 |
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36 def test_seek(self): |
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37 if verbose: |
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38 print('create large file via seek (may be sparse file) ...') |
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39 with self.open(TESTFN, 'wb') as f: |
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40 f.write(b'z') |
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41 f.seek(0) |
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42 f.seek(size) |
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43 f.write(b'a') |
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44 f.flush() |
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45 if verbose: |
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46 print('check file size with os.fstat') |
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47 self.assertEqual(os.fstat(f.fileno())[stat.ST_SIZE], size+1) |
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48 |
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49 def test_osstat(self): |
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50 if verbose: |
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51 print('check file size with os.stat') |
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52 self.assertEqual(os.stat(TESTFN)[stat.ST_SIZE], size+1) |
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53 |
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54 def test_seek_read(self): |
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58 self.assertEqual(f.tell(), 0) |
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59 self.assertEqual(f.read(1), b'z') |
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60 self.assertEqual(f.tell(), 1) |
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61 f.seek(0) |
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62 self.assertEqual(f.tell(), 0) |
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63 f.seek(0, 0) |
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64 self.assertEqual(f.tell(), 0) |
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65 f.seek(42) |
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66 self.assertEqual(f.tell(), 42) |
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67 f.seek(42, 0) |
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68 self.assertEqual(f.tell(), 42) |
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69 f.seek(42, 1) |
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70 self.assertEqual(f.tell(), 84) |
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71 f.seek(0, 1) |
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72 self.assertEqual(f.tell(), 84) |
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73 f.seek(0, 2) # seek from the end |
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74 self.assertEqual(f.tell(), size + 1 + 0) |
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75 f.seek(-10, 2) |
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76 self.assertEqual(f.tell(), size + 1 - 10) |
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77 f.seek(-size-1, 2) |
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78 self.assertEqual(f.tell(), 0) |
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79 f.seek(size) |
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80 self.assertEqual(f.tell(), size) |
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81 # the 'a' that was written at the end of file above |
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82 self.assertEqual(f.read(1), b'a') |
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83 f.seek(-size-1, 1) |
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84 self.assertEqual(f.read(1), b'z') |
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85 self.assertEqual(f.tell(), 1) |
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87 def test_lseek(self): |
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88 if verbose: |
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89 print('play around with os.lseek() with the built largefile') |
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90 with self.open(TESTFN, 'rb') as f: |
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91 self.assertEqual(os.lseek(f.fileno(), 0, 0), 0) |
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92 self.assertEqual(os.lseek(f.fileno(), 42, 0), 42) |
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93 self.assertEqual(os.lseek(f.fileno(), 42, 1), 84) |
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94 self.assertEqual(os.lseek(f.fileno(), 0, 1), 84) |
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95 self.assertEqual(os.lseek(f.fileno(), 0, 2), size+1+0) |
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96 self.assertEqual(os.lseek(f.fileno(), -10, 2), size+1-10) |
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97 self.assertEqual(os.lseek(f.fileno(), -size-1, 2), 0) |
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98 self.assertEqual(os.lseek(f.fileno(), size, 0), size) |
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99 # the 'a' that was written at the end of file above |
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100 self.assertEqual(f.read(1), b'a') |
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102 def test_truncate(self): |
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103 if verbose: |
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104 print('try truncate') |
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105 with self.open(TESTFN, 'r+b') as f: |
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106 # this is already decided before start running the test suite |
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107 # but we do it anyway for extra protection |
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108 if not hasattr(f, 'truncate'): |
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109 raise unittest.SkipTest("open().truncate() not available on this system") |
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110 f.seek(0, 2) |
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111 # else we've lost track of the true size |
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112 self.assertEqual(f.tell(), size+1) |
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113 # Cut it back via seek + truncate with no argument. |
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114 newsize = size - 10 |
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115 f.seek(newsize) |
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116 f.truncate() |
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117 self.assertEqual(f.tell(), newsize) # else pointer moved |
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118 f.seek(0, 2) |
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119 self.assertEqual(f.tell(), newsize) # else wasn't truncated |
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120 # Ensure that truncate(smaller than true size) shrinks |
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121 # the file. |
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122 newsize -= 1 |
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123 f.seek(42) |
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124 f.truncate(newsize) |
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125 self.assertEqual(f.tell(), 42) |
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126 f.seek(0, 2) |
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127 self.assertEqual(f.tell(), newsize) |
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128 # XXX truncate(larger than true size) is ill-defined |
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129 # across platform; cut it waaaaay back |
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130 f.seek(0) |
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131 f.truncate(1) |
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132 self.assertEqual(f.tell(), 0) # else pointer moved |
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133 f.seek(0) |
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134 self.assertEqual(len(f.read()), 1) # else wasn't truncated |
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135 |
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136 def test_seekable(self): |
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137 # Issue #5016; seekable() can return False when the current position |
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138 # is negative when truncated to an int. |
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139 for pos in (2**31-1, 2**31, 2**31+1): |
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140 with self.open(TESTFN, 'rb') as f: |
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141 f.seek(pos) |
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143 |
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144 |
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145 def test_main(): |
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146 # On Windows and Mac OSX this test comsumes large resources; It |
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147 # takes a long time to build the >2GB file and takes >2GB of disk |
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148 # space therefore the resource must be enabled to run this test. |
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149 # If not, nothing after this line stanza will be executed. |
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150 if sys.platform[:3] == 'win' or sys.platform == 'darwin': |
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151 requires('largefile', |
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152 'test requires %s bytes and a long time to run' % str(size)) |
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153 else: |
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154 # Only run if the current filesystem supports large files. |
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155 # (Skip this test on Windows, since we now always support |
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156 # large files.) |
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157 f = open(TESTFN, 'wb', buffering=0) |
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158 try: |
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159 # 2**31 == 2147483648 |
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160 f.seek(2147483649) |
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161 # Seeking is not enough of a test: you must write and |
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162 # flush, too! |
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163 f.write(b'x') |
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164 f.flush() |
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165 except (IOError, OverflowError): |
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166 f.close() |
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167 unlink(TESTFN) |
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168 raise unittest.SkipTest("filesystem does not have largefile support") |
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169 else: |
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170 f.close() |
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171 suite = unittest.TestSuite() |
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172 for _open, prefix in [(io.open, 'C'), (pyio.open, 'Py')]: |
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173 class TestCase(LargeFileTest): |
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174 pass |
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175 TestCase.open = staticmethod(_open) |
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176 TestCase.__name__ = prefix + LargeFileTest.__name__ |
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177 suite.addTest(TestCase('test_seek')) |
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178 suite.addTest(TestCase('test_osstat')) |
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179 suite.addTest(TestCase('test_seek_read')) |
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180 suite.addTest(TestCase('test_lseek')) |
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181 with _open(TESTFN, 'wb') as f: |
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182 if hasattr(f, 'truncate'): |
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183 suite.addTest(TestCase('test_truncate')) |
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184 suite.addTest(TestCase('test_seekable')) |
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185 unlink(TESTFN) |
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186 try: |
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187 run_unittest(suite) |
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188 finally: |
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189 unlink(TESTFN) |
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190 |
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191 if __name__ == '__main__': |
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192 test_main() |