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backport test_fileio
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Benjamin Peterson
parent
bf89981839
commit
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1 changed files with 240 additions and 0 deletions
240
Lib/test/test_fileio.py
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240
Lib/test/test_fileio.py
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# Adapted from test_file.py by Daniel Stutzbach
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#from __future__ import unicode_literals
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import sys
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import os
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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 test.test_support import TESTFN, findfile, run_unittest
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from UserList import UserList
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import _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._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.assertEquals(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(bytearray(range(20))))
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self.assertEquals(self.f.tell(), 20)
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self.f.seek(0)
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self.assertEquals(self.f.tell(), 0)
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self.f.seek(10)
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self.assertEquals(self.f.tell(), 10)
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self.f.seek(5, 1)
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self.assertEquals(self.f.tell(), 15)
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self.f.seek(-5, 1)
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self.assertEquals(self.f.tell(), 10)
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self.f.seek(-5, 2)
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self.assertEquals(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.assertEquals(f.mode, "w")
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self.assertEquals(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(bytearray([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._FileIO(TESTFN, 'r')
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n = self.f.readinto(a)
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self.assertEquals(array('b', [1, 2]), a[:n])
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def testRepr(self):
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self.assertEquals(repr(self.f),
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"_fileio._FileIO(%d, %s)" % (self.f.fileno(),
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repr(self.f.mode)))
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def testErrors(self):
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f = self.f
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self.assert_(not f.isatty())
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self.assert_(not f.closed)
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#self.assertEquals(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.assert_(f.closed)
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f = _fileio._FileIO(TESTFN, 'r')
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self.assertRaises(TypeError, f.readinto, "")
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self.assert_(not f.closed)
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f.close()
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self.assert_(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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if sys.platform.startswith('atheos'):
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methods.remove('truncate')
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self.f.close()
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self.assert_(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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class OtherFileTests(unittest.TestCase):
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def testAbles(self):
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try:
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f = _fileio._FileIO(TESTFN, "w")
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self.assertEquals(f.readable(), False)
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self.assertEquals(f.writable(), True)
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self.assertEquals(f.seekable(), True)
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f.close()
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f = _fileio._FileIO(TESTFN, "r")
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self.assertEquals(f.readable(), True)
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self.assertEquals(f.writable(), False)
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self.assertEquals(f.seekable(), True)
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f.close()
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f = _fileio._FileIO(TESTFN, "a+")
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self.assertEquals(f.readable(), True)
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self.assertEquals(f.writable(), True)
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self.assertEquals(f.seekable(), True)
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self.assertEquals(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._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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f = _fileio._FileIO("/dev/tty", "a")
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self.assertEquals(f.readable(), False)
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self.assertEquals(f.writable(), True)
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if sys.platform != "darwin" and \
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not sys.platform.startswith('freebsd') 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.assertEquals(f.seekable(), False)
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self.assertEquals(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+", "rb", "rt"):
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try:
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f = _fileio._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._FileIO(str(TESTFN), "w")
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f.close()
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os.unlink(TESTFN)
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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._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 s.find(TESTFN) != -1 or s.find(bad_mode) == -1:
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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 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._FileIO(TESTFN, 'w')
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f.write(bytes(bytearray(range(11))))
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f.close()
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f = _fileio._FileIO(TESTFN,'r+')
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data = f.read(5)
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if data != bytes(bytearray(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 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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