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Diffstat (limited to 'lib/python2.7/test/test_largefile.py')
| -rw-r--r-- | lib/python2.7/test/test_largefile.py | 200 |
1 files changed, 0 insertions, 200 deletions
diff --git a/lib/python2.7/test/test_largefile.py b/lib/python2.7/test/test_largefile.py deleted file mode 100644 index 16da8d8..0000000 --- a/lib/python2.7/test/test_largefile.py +++ /dev/null @@ -1,200 +0,0 @@ -"""Test largefile support on system where this makes sense. -""" - -from __future__ import print_function - -import os -import stat -import sys -import unittest -from test.test_support import run_unittest, TESTFN, verbose, requires, \ - unlink -import io # C implementation of io -import _pyio as pyio # Python implementation of io - -try: - import signal - # The default handler for SIGXFSZ is to abort the process. - # By ignoring it, system calls exceeding the file size resource - # limit will raise IOError instead of crashing the interpreter. - oldhandler = signal.signal(signal.SIGXFSZ, signal.SIG_IGN) -except (ImportError, AttributeError): - pass - -# create >2GB file (2GB = 2147483648 bytes) -size = 2500000000 - - -class LargeFileTest(unittest.TestCase): - """Test that each file function works as expected for a large - (i.e. > 2GB, do we have to check > 4GB) files. - - NOTE: the order of execution of the test methods is important! test_seek - must run first to create the test file. File cleanup must also be handled - outside the test instances because of this. - - """ - - def test_seek(self): - if verbose: - print('create large file via seek (may be sparse file) ...') - with self.open(TESTFN, 'wb') as f: - f.write(b'z') - f.seek(0) - f.seek(size) - f.write(b'a') - f.flush() - if verbose: - print('check file size with os.fstat') - self.assertEqual(os.fstat(f.fileno())[stat.ST_SIZE], size+1) - - def test_osstat(self): - if verbose: - print('check file size with os.stat') - self.assertEqual(os.stat(TESTFN)[stat.ST_SIZE], size+1) - - def test_seek_read(self): - if verbose: - print('play around with seek() and read() with the built largefile') - with self.open(TESTFN, 'rb') as f: - self.assertEqual(f.tell(), 0) - self.assertEqual(f.read(1), b'z') - self.assertEqual(f.tell(), 1) - f.seek(0) - self.assertEqual(f.tell(), 0) - f.seek(0, 0) - self.assertEqual(f.tell(), 0) - f.seek(42) - self.assertEqual(f.tell(), 42) - f.seek(42, 0) - self.assertEqual(f.tell(), 42) - f.seek(42, 1) - self.assertEqual(f.tell(), 84) - f.seek(0, 1) - self.assertEqual(f.tell(), 84) - f.seek(0, 2) # seek from the end - self.assertEqual(f.tell(), size + 1 + 0) - f.seek(-10, 2) - self.assertEqual(f.tell(), size + 1 - 10) - f.seek(-size-1, 2) - self.assertEqual(f.tell(), 0) - f.seek(size) - self.assertEqual(f.tell(), size) - # the 'a' that was written at the end of file above - self.assertEqual(f.read(1), b'a') - f.seek(-size-1, 1) - self.assertEqual(f.read(1), b'z') - self.assertEqual(f.tell(), 1) - - def test_lseek(self): - if verbose: - print('play around with os.lseek() with the built largefile') - with self.open(TESTFN, 'rb') as f: - self.assertEqual(os.lseek(f.fileno(), 0, 0), 0) - self.assertEqual(os.lseek(f.fileno(), 42, 0), 42) - self.assertEqual(os.lseek(f.fileno(), 42, 1), 84) - self.assertEqual(os.lseek(f.fileno(), 0, 1), 84) - self.assertEqual(os.lseek(f.fileno(), 0, 2), size+1+0) - self.assertEqual(os.lseek(f.fileno(), -10, 2), size+1-10) - self.assertEqual(os.lseek(f.fileno(), -size-1, 2), 0) - self.assertEqual(os.lseek(f.fileno(), size, 0), size) - # the 'a' that was written at the end of file above - self.assertEqual(f.read(1), b'a') - - def test_truncate(self): - if verbose: - print('try truncate') - with self.open(TESTFN, 'r+b') as f: - # this is already decided before start running the test suite - # but we do it anyway for extra protection - if not hasattr(f, 'truncate'): - raise unittest.SkipTest("open().truncate() not available on this system") - f.seek(0, 2) - # else we've lost track of the true size - self.assertEqual(f.tell(), size+1) - # Cut it back via seek + truncate with no argument. - newsize = size - 10 - f.seek(newsize) - f.truncate() - self.assertEqual(f.tell(), newsize) # else pointer moved - f.seek(0, 2) - self.assertEqual(f.tell(), newsize) # else wasn't truncated - # Ensure that truncate(smaller than true size) shrinks - # the file. - newsize -= 1 - f.seek(42) - f.truncate(newsize) - if self.new_io: - self.assertEqual(f.tell(), 42) - f.seek(0, 2) - self.assertEqual(f.tell(), newsize) - # XXX truncate(larger than true size) is ill-defined - # across platform; cut it waaaaay back - f.seek(0) - f.truncate(1) - if self.new_io: - self.assertEqual(f.tell(), 0) # else pointer moved - f.seek(0) - self.assertEqual(len(f.read()), 1) # else wasn't truncated - - def test_seekable(self): - # Issue #5016; seekable() can return False when the current position - # is negative when truncated to an int. - if not self.new_io: - self.skipTest("builtin file doesn't have seekable()") - for pos in (2**31-1, 2**31, 2**31+1): - with self.open(TESTFN, 'rb') as f: - f.seek(pos) - self.assertTrue(f.seekable()) - - -def test_main(): - # On Windows and Mac OSX this test comsumes large resources; It - # takes a long time to build the >2GB file and takes >2GB of disk - # space therefore the resource must be enabled to run this test. - # If not, nothing after this line stanza will be executed. - if sys.platform[:3] == 'win' or sys.platform == 'darwin': - requires('largefile', - 'test requires %s bytes and a long time to run' % str(size)) - else: - # Only run if the current filesystem supports large files. - # (Skip this test on Windows, since we now always support - # large files.) - f = open(TESTFN, 'wb', buffering=0) - try: - # 2**31 == 2147483648 - f.seek(2147483649) - # Seeking is not enough of a test: you must write and - # flush, too! - f.write(b'x') - f.flush() - except (IOError, OverflowError): - f.close() - unlink(TESTFN) - raise unittest.SkipTest("filesystem does not have largefile support") - else: - f.close() - suite = unittest.TestSuite() - for _open, prefix in [(io.open, 'C'), (pyio.open, 'Py'), - (open, 'Builtin')]: - class TestCase(LargeFileTest): - pass - TestCase.open = staticmethod(_open) - TestCase.new_io = _open is not open - TestCase.__name__ = prefix + LargeFileTest.__name__ - suite.addTest(TestCase('test_seek')) - suite.addTest(TestCase('test_osstat')) - suite.addTest(TestCase('test_seek_read')) - suite.addTest(TestCase('test_lseek')) - with _open(TESTFN, 'wb') as f: - if hasattr(f, 'truncate'): - suite.addTest(TestCase('test_truncate')) - suite.addTest(TestCase('test_seekable')) - unlink(TESTFN) - try: - run_unittest(suite) - finally: - unlink(TESTFN) - -if __name__ == '__main__': - test_main() |