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437 lines
13 KiB
Python
437 lines
13 KiB
Python
# Adapted from test_file.py by Daniel Stutzbach
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import sys
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import os
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import errno
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import unittest
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from array import array
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from weakref import proxy
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from functools import wraps
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from test.support import TESTFN, check_warnings, run_unittest, make_bad_fd
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from _io import FileIO as _FileIO
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class AutoFileTests(unittest.TestCase):
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# file tests for which a test file is automatically set up
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def setUp(self):
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self.f = _FileIO(TESTFN, 'w')
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def tearDown(self):
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if self.f:
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self.f.close()
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os.remove(TESTFN)
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def testWeakRefs(self):
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# verify weak references
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p = proxy(self.f)
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p.write(bytes(range(10)))
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self.assertEqual(self.f.tell(), p.tell())
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self.f.close()
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self.f = None
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self.assertRaises(ReferenceError, getattr, p, 'tell')
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def testSeekTell(self):
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self.f.write(bytes(range(20)))
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self.assertEqual(self.f.tell(), 20)
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self.f.seek(0)
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self.assertEqual(self.f.tell(), 0)
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self.f.seek(10)
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self.assertEqual(self.f.tell(), 10)
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self.f.seek(5, 1)
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self.assertEqual(self.f.tell(), 15)
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self.f.seek(-5, 1)
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self.assertEqual(self.f.tell(), 10)
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self.f.seek(-5, 2)
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self.assertEqual(self.f.tell(), 15)
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def testAttributes(self):
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# verify expected attributes exist
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f = self.f
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self.assertEqual(f.mode, "wb")
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self.assertEqual(f.closed, False)
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# verify the attributes are readonly
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for attr in 'mode', 'closed':
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self.assertRaises((AttributeError, TypeError),
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setattr, f, attr, 'oops')
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def testReadinto(self):
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# verify readinto
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self.f.write(bytes([1, 2]))
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self.f.close()
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a = array('b', b'x'*10)
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self.f = _FileIO(TESTFN, 'r')
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n = self.f.readinto(a)
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self.assertEqual(array('b', [1, 2]), a[:n])
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def test_none_args(self):
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self.f.write(b"hi\nbye\nabc")
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self.f.close()
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self.f = _FileIO(TESTFN, 'r')
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self.assertEqual(self.f.read(None), b"hi\nbye\nabc")
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self.f.seek(0)
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self.assertEqual(self.f.readline(None), b"hi\n")
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self.assertEqual(self.f.readlines(None), [b"bye\n", b"abc"])
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def test_reject(self):
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self.assertRaises(TypeError, self.f.write, "Hello!")
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def testRepr(self):
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self.assertEqual(repr(self.f), "<_io.FileIO name=%r mode=%r>"
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% (self.f.name, self.f.mode))
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del self.f.name
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self.assertEqual(repr(self.f), "<_io.FileIO fd=%r mode=%r>"
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% (self.f.fileno(), self.f.mode))
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self.f.close()
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self.assertEqual(repr(self.f), "<_io.FileIO [closed]>")
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def testErrors(self):
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f = self.f
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self.assertTrue(not f.isatty())
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self.assertTrue(not f.closed)
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#self.assertEqual(f.name, TESTFN)
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self.assertRaises(ValueError, f.read, 10) # Open for reading
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f.close()
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self.assertTrue(f.closed)
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f = _FileIO(TESTFN, 'r')
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self.assertRaises(TypeError, f.readinto, "")
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self.assertTrue(not f.closed)
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f.close()
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self.assertTrue(f.closed)
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def testMethods(self):
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methods = ['fileno', 'isatty', 'read', 'readinto',
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'seek', 'tell', 'truncate', 'write', 'seekable',
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'readable', 'writable']
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self.f.close()
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self.assertTrue(self.f.closed)
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for methodname in methods:
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method = getattr(self.f, methodname)
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# should raise on closed file
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self.assertRaises(ValueError, method)
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def testOpendir(self):
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# Issue 3703: opening a directory should fill the errno
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# Windows always returns "[Errno 13]: Permission denied
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# Unix calls dircheck() and returns "[Errno 21]: Is a directory"
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try:
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_FileIO('.', 'r')
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except IOError as e:
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self.assertNotEqual(e.errno, 0)
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self.assertEqual(e.filename, ".")
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else:
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self.fail("Should have raised IOError")
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@unittest.skipIf(os.name == 'nt', "test only works on a POSIX-like system")
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def testOpenDirFD(self):
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fd = os.open('.', os.O_RDONLY)
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with self.assertRaises(IOError) as cm:
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_FileIO(fd, 'r')
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os.close(fd)
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self.assertEqual(cm.exception.errno, errno.EISDIR)
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#A set of functions testing that we get expected behaviour if someone has
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#manually closed the internal file descriptor. First, a decorator:
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def ClosedFD(func):
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@wraps(func)
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def wrapper(self):
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#forcibly close the fd before invoking the problem function
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f = self.f
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os.close(f.fileno())
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try:
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func(self, f)
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finally:
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try:
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self.f.close()
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except IOError:
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pass
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return wrapper
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def ClosedFDRaises(func):
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@wraps(func)
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def wrapper(self):
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#forcibly close the fd before invoking the problem function
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f = self.f
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os.close(f.fileno())
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try:
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func(self, f)
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except IOError as e:
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self.assertEqual(e.errno, errno.EBADF)
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else:
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self.fail("Should have raised IOError")
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finally:
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try:
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self.f.close()
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except IOError:
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pass
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return wrapper
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@ClosedFDRaises
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def testErrnoOnClose(self, f):
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f.close()
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@ClosedFDRaises
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def testErrnoOnClosedWrite(self, f):
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f.write(b'a')
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@ClosedFDRaises
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def testErrnoOnClosedSeek(self, f):
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f.seek(0)
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@ClosedFDRaises
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def testErrnoOnClosedTell(self, f):
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f.tell()
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@ClosedFDRaises
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def testErrnoOnClosedTruncate(self, f):
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f.truncate(0)
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@ClosedFD
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def testErrnoOnClosedSeekable(self, f):
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f.seekable()
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@ClosedFD
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def testErrnoOnClosedReadable(self, f):
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f.readable()
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@ClosedFD
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def testErrnoOnClosedWritable(self, f):
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f.writable()
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@ClosedFD
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def testErrnoOnClosedFileno(self, f):
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f.fileno()
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@ClosedFD
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def testErrnoOnClosedIsatty(self, f):
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self.assertEqual(f.isatty(), False)
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def ReopenForRead(self):
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try:
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self.f.close()
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except IOError:
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pass
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self.f = _FileIO(TESTFN, 'r')
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os.close(self.f.fileno())
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return self.f
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@ClosedFDRaises
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def testErrnoOnClosedRead(self, f):
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f = self.ReopenForRead()
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f.read(1)
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@ClosedFDRaises
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def testErrnoOnClosedReadall(self, f):
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f = self.ReopenForRead()
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f.readall()
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@ClosedFDRaises
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def testErrnoOnClosedReadinto(self, f):
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f = self.ReopenForRead()
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a = array('b', b'x'*10)
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f.readinto(a)
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class OtherFileTests(unittest.TestCase):
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def testAbles(self):
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try:
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f = _FileIO(TESTFN, "w")
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self.assertEqual(f.readable(), False)
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self.assertEqual(f.writable(), True)
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self.assertEqual(f.seekable(), True)
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f.close()
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f = _FileIO(TESTFN, "r")
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self.assertEqual(f.readable(), True)
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self.assertEqual(f.writable(), False)
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self.assertEqual(f.seekable(), True)
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f.close()
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f = _FileIO(TESTFN, "a+")
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self.assertEqual(f.readable(), True)
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self.assertEqual(f.writable(), True)
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self.assertEqual(f.seekable(), True)
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self.assertEqual(f.isatty(), False)
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f.close()
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if sys.platform != "win32":
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try:
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f = _FileIO("/dev/tty", "a")
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except EnvironmentError:
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# When run in a cron job there just aren't any
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# ttys, so skip the test. This also handles other
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# OS'es that don't support /dev/tty.
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pass
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else:
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self.assertEqual(f.readable(), False)
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self.assertEqual(f.writable(), True)
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if sys.platform != "darwin" and \
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'bsd' not in sys.platform and \
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not sys.platform.startswith('sunos'):
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# Somehow /dev/tty appears seekable on some BSDs
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self.assertEqual(f.seekable(), False)
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self.assertEqual(f.isatty(), True)
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f.close()
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finally:
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os.unlink(TESTFN)
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def testModeStrings(self):
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# check invalid mode strings
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for mode in ("", "aU", "wU+", "rw", "rt"):
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try:
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f = _FileIO(TESTFN, mode)
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except ValueError:
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pass
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else:
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f.close()
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self.fail('%r is an invalid file mode' % mode)
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def testUnicodeOpen(self):
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# verify repr works for unicode too
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f = _FileIO(str(TESTFN), "w")
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f.close()
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os.unlink(TESTFN)
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def testBytesOpen(self):
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# Opening a bytes filename
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try:
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fn = TESTFN.encode("ascii")
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except UnicodeEncodeError:
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# Skip test
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return
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f = _FileIO(fn, "w")
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try:
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f.write(b"abc")
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f.close()
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with open(TESTFN, "rb") as f:
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self.assertEqual(f.read(), b"abc")
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finally:
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os.unlink(TESTFN)
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def testConstructorHandlesNULChars(self):
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fn_with_NUL = 'foo\0bar'
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self.assertRaises(TypeError, _FileIO, fn_with_NUL, 'w')
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self.assertRaises(TypeError, _FileIO, bytes(fn_with_NUL, 'ascii'), 'w')
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def testInvalidFd(self):
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self.assertRaises(ValueError, _FileIO, -10)
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self.assertRaises(OSError, _FileIO, make_bad_fd())
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if sys.platform == 'win32':
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import msvcrt
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self.assertRaises(IOError, msvcrt.get_osfhandle, make_bad_fd())
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def testBadModeArgument(self):
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# verify that we get a sensible error message for bad mode argument
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bad_mode = "qwerty"
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try:
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f = _FileIO(TESTFN, bad_mode)
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except ValueError as msg:
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if msg.args[0] != 0:
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s = str(msg)
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if TESTFN in s or bad_mode not in s:
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self.fail("bad error message for invalid mode: %s" % s)
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# if msg.args[0] == 0, we're probably on Windows where there may be
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# no obvious way to discover why open() failed.
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else:
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f.close()
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self.fail("no error for invalid mode: %s" % bad_mode)
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def testTruncate(self):
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f = _FileIO(TESTFN, 'w')
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f.write(bytes(bytearray(range(10))))
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self.assertEqual(f.tell(), 10)
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f.truncate(5)
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self.assertEqual(f.tell(), 10)
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self.assertEqual(f.seek(0, os.SEEK_END), 5)
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f.truncate(15)
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self.assertEqual(f.tell(), 5)
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self.assertEqual(f.seek(0, os.SEEK_END), 15)
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f.close()
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def testTruncateOnWindows(self):
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def bug801631():
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# SF bug <http://www.python.org/sf/801631>
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# "file.truncate fault on windows"
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f = _FileIO(TESTFN, 'w')
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f.write(bytes(range(11)))
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f.close()
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f = _FileIO(TESTFN,'r+')
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data = f.read(5)
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if data != bytes(range(5)):
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self.fail("Read on file opened for update failed %r" % data)
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if f.tell() != 5:
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self.fail("File pos after read wrong %d" % f.tell())
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f.truncate()
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if f.tell() != 5:
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self.fail("File pos after ftruncate wrong %d" % f.tell())
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f.close()
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size = os.path.getsize(TESTFN)
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if size != 5:
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self.fail("File size after ftruncate wrong %d" % size)
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try:
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bug801631()
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finally:
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os.unlink(TESTFN)
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def testAppend(self):
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try:
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f = open(TESTFN, 'wb')
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f.write(b'spam')
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f.close()
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f = open(TESTFN, 'ab')
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f.write(b'eggs')
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f.close()
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f = open(TESTFN, 'rb')
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d = f.read()
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f.close()
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self.assertEqual(d, b'spameggs')
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finally:
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try:
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os.unlink(TESTFN)
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except:
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pass
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def testInvalidInit(self):
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self.assertRaises(TypeError, _FileIO, "1", 0, 0)
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def testWarnings(self):
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with check_warnings(quiet=True) as w:
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self.assertEqual(w.warnings, [])
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self.assertRaises(TypeError, _FileIO, [])
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self.assertEqual(w.warnings, [])
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self.assertRaises(ValueError, _FileIO, "/some/invalid/name", "rt")
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self.assertEqual(w.warnings, [])
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def testUnclosedFDOnException(self):
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class MyException(Exception): pass
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class MyFileIO(_FileIO):
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def __setattr__(self, name, value):
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if name == "name":
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raise MyException("blocked setting name")
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return super(MyFileIO, self).__setattr__(name, value)
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fd = os.open(__file__, os.O_RDONLY)
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self.assertRaises(MyException, MyFileIO, fd)
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os.close(fd) # should not raise OSError(EBADF)
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def test_main():
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# Historically, these tests have been sloppy about removing TESTFN.
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# So get rid of it no matter what.
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try:
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run_unittest(AutoFileTests, OtherFileTests)
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finally:
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if os.path.exists(TESTFN):
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os.unlink(TESTFN)
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if __name__ == '__main__':
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test_main()
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