diff options
Diffstat (limited to 'Lib')
| -rw-r--r-- | Lib/test/test_largefile.py | 114 |
1 files changed, 51 insertions, 63 deletions
diff --git a/Lib/test/test_largefile.py b/Lib/test/test_largefile.py index 7502dc3..5b276e7 100644 --- a/Lib/test/test_largefile.py +++ b/Lib/test/test_largefile.py @@ -5,55 +5,50 @@ import os import stat import sys import unittest -from test.support import run_unittest, TESTFN, verbose, requires, \ - unlink +from test.support import TESTFN, 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 OSError instead of crashing the interpreter. - oldhandler = signal.signal(signal.SIGXFSZ, signal.SIG_IGN) -except (ImportError, AttributeError): - pass - -# create >2GB file (2GB = 2147483648 bytes) +# size of file to create (>2GB; 2GB == 2147483648 bytes) size = 2500000000 +class LargeFileTest: + """Test that each file function works as expected for large + (i.e. > 2GB) files. + """ -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. + def setUp(self): + if os.path.exists(TESTFN): + mode = 'r+b' + else: + mode = 'w+b' - 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. + with self.open(TESTFN, mode) as f: + current_size = os.fstat(f.fileno())[stat.ST_SIZE] + if current_size == size+1: + return - """ + if current_size == 0: + f.write(b'z') - 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) + @classmethod + def tearDownClass(cls): + with cls.open(TESTFN, 'wb'): + pass + if not os.stat(TESTFN)[stat.ST_SIZE] == 0: + raise cls.failureException('File was not truncated by opening ' + 'with mode "wb"') + 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') @@ -85,8 +80,6 @@ class LargeFileTest(unittest.TestCase): 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) @@ -100,13 +93,10 @@ class LargeFileTest(unittest.TestCase): 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") + 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) @@ -141,8 +131,16 @@ class LargeFileTest(unittest.TestCase): f.seek(pos) self.assertTrue(f.seekable()) +def setUpModule(): + 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 OSError instead of crashing the interpreter. + signal.signal(signal.SIGXFSZ, signal.SIG_IGN) + except (ImportError, AttributeError): + pass -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. @@ -158,35 +156,25 @@ def test_main(): try: # 2**31 == 2147483648 f.seek(2147483649) - # Seeking is not enough of a test: you must write and - # flush, too! + # Seeking is not enough of a test: you must write and flush, too! f.write(b'x') f.flush() except (OSError, OverflowError): + raise unittest.SkipTest("filesystem does not have " + "largefile support") + finally: 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')]: - class TestCase(LargeFileTest): - pass - TestCase.open = staticmethod(_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) + + +class CLargeFileTest(LargeFileTest, unittest.TestCase): + open = staticmethod(io.open) + +class PyLargeFileTest(LargeFileTest, unittest.TestCase): + open = staticmethod(pyio.open) + +def tearDownModule(): + unlink(TESTFN) if __name__ == '__main__': - test_main() + unittest.main() |