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336 lines
12 KiB
Python
336 lines
12 KiB
Python
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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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 = open(TESTFN, 'wb')
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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('teststring')
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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 testAttributes(self):
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# verify expected attributes exist
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f = self.f
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softspace = f.softspace
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f.name # merely shouldn't blow up
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f.mode # ditto
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f.closed # ditto
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# verify softspace is writable
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f.softspace = softspace # merely shouldn't blow up
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# verify the others aren't
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for attr in 'name', 'mode', 'closed':
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self.assertRaises((AttributeError, TypeError), setattr, f, attr, 'oops')
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def testReadinto(self):
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# verify readinto
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self.f.write('12')
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self.f.close()
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a = array('c', 'x'*10)
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self.f = open(TESTFN, 'rb')
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n = self.f.readinto(a)
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self.assertEquals('12', a.tostring()[:n])
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def testWritelinesUserList(self):
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# verify writelines with instance sequence
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l = UserList(['1', '2'])
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self.f.writelines(l)
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self.f.close()
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self.f = open(TESTFN, 'rb')
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buf = self.f.read()
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self.assertEquals(buf, '12')
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def testWritelinesIntegers(self):
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# verify writelines with integers
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self.assertRaises(TypeError, self.f.writelines, [1, 2, 3])
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def testWritelinesIntegersUserList(self):
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# verify writelines with integers in UserList
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l = UserList([1,2,3])
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self.assertRaises(TypeError, self.f.writelines, l)
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def testWritelinesNonString(self):
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# verify writelines with non-string object
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class NonString:
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pass
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self.assertRaises(TypeError, self.f.writelines,
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[NonString(), NonString()])
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def testRepr(self):
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# verify repr works
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self.assert_(repr(self.f).startswith("<open file '" + TESTFN))
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def testErrors(self):
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f = self.f
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self.assertEquals(f.name, TESTFN)
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self.assert_(not f.isatty())
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self.assert_(not f.closed)
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self.assertRaises(TypeError, f.readinto, "")
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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', 'flush', 'isatty', 'next', 'read', 'readinto',
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'readline', 'readlines', 'seek', 'tell', 'truncate',
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'write', 'xreadlines', '__iter__']
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if sys.platform.startswith('atheos'):
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methods.remove('truncate')
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# __exit__ should close the file
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self.f.__exit__(None, None, None)
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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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self.assertRaises(ValueError, self.f.writelines, [])
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# file is closed, __exit__ shouldn't do anything
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self.assertEquals(self.f.__exit__(None, None, None), None)
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# it must also return None if an exception was given
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try:
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1/0
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except:
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self.assertEquals(self.f.__exit__(*sys.exc_info()), None)
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class OtherFileTests(unittest.TestCase):
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def testModeStrings(self):
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# check invalid mode strings
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for mode in ("", "aU", "wU+"):
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try:
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f = open(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 testStdin(self):
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# This causes the interpreter to exit on OSF1 v5.1.
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if sys.platform != 'osf1V5':
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self.assertRaises(IOError, sys.stdin.seek, -1)
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else:
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print >>sys.__stdout__, (
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' Skipping sys.stdin.seek(-1), it may crash the interpreter.'
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' Test manually.')
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self.assertRaises(IOError, sys.stdin.truncate)
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def testUnicodeOpen(self):
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# verify repr works for unicode too
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f = open(unicode(TESTFN), "w")
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self.assert_(repr(f).startswith("<open file u'" + TESTFN))
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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 = open(TESTFN, bad_mode)
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except ValueError, msg:
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if msg[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[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 testSetBufferSize(self):
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# make sure that explicitly setting the buffer size doesn't cause
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# misbehaviour especially with repeated close() calls
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for s in (-1, 0, 1, 512):
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try:
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f = open(TESTFN, 'w', s)
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f.write(str(s))
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f.close()
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f.close()
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f = open(TESTFN, 'r', s)
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d = int(f.read())
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f.close()
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f.close()
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except IOError, msg:
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self.fail('error setting buffer size %d: %s' % (s, str(msg)))
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self.assertEquals(d, s)
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def testTruncateOnWindows(self):
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os.unlink(TESTFN)
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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 = open(TESTFN, 'wb')
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f.write('12345678901') # 11 bytes
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f.close()
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f = open(TESTFN,'rb+')
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data = f.read(5)
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if data != '12345':
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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 testIteration(self):
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# Test the complex interaction when mixing file-iteration and the
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# various read* methods. Ostensibly, the mixture could just be tested
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# to work when it should work according to the Python language,
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# instead of fail when it should fail according to the current CPython
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# implementation. People don't always program Python the way they
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# should, though, and the implemenation might change in subtle ways,
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# so we explicitly test for errors, too; the test will just have to
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# be updated when the implementation changes.
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dataoffset = 16384
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filler = "ham\n"
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assert not dataoffset % len(filler), \
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"dataoffset must be multiple of len(filler)"
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nchunks = dataoffset // len(filler)
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testlines = [
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"spam, spam and eggs\n",
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"eggs, spam, ham and spam\n",
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"saussages, spam, spam and eggs\n",
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"spam, ham, spam and eggs\n",
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"spam, spam, spam, spam, spam, ham, spam\n",
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"wonderful spaaaaaam.\n"
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]
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methods = [("readline", ()), ("read", ()), ("readlines", ()),
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("readinto", (array("c", " "*100),))]
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try:
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# Prepare the testfile
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bag = open(TESTFN, "w")
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bag.write(filler * nchunks)
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bag.writelines(testlines)
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bag.close()
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# Test for appropriate errors mixing read* and iteration
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for methodname, args in methods:
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f = open(TESTFN)
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if f.next() != filler:
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self.fail, "Broken testfile"
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meth = getattr(f, methodname)
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try:
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meth(*args)
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except ValueError:
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pass
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else:
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self.fail("%s%r after next() didn't raise ValueError" %
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(methodname, args))
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f.close()
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# Test to see if harmless (by accident) mixing of read* and
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# iteration still works. This depends on the size of the internal
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# iteration buffer (currently 8192,) but we can test it in a
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# flexible manner. Each line in the bag o' ham is 4 bytes
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# ("h", "a", "m", "\n"), so 4096 lines of that should get us
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# exactly on the buffer boundary for any power-of-2 buffersize
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# between 4 and 16384 (inclusive).
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f = open(TESTFN)
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for i in range(nchunks):
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f.next()
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testline = testlines.pop(0)
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try:
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line = f.readline()
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except ValueError:
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self.fail("readline() after next() with supposedly empty "
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"iteration-buffer failed anyway")
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if line != testline:
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self.fail("readline() after next() with empty buffer "
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"failed. Got %r, expected %r" % (line, testline))
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testline = testlines.pop(0)
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buf = array("c", "\x00" * len(testline))
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try:
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f.readinto(buf)
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except ValueError:
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self.fail("readinto() after next() with supposedly empty "
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"iteration-buffer failed anyway")
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line = buf.tostring()
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if line != testline:
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self.fail("readinto() after next() with empty buffer "
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"failed. Got %r, expected %r" % (line, testline))
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testline = testlines.pop(0)
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try:
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line = f.read(len(testline))
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except ValueError:
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self.fail("read() after next() with supposedly empty "
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"iteration-buffer failed anyway")
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if line != testline:
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self.fail("read() after next() with empty buffer "
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"failed. Got %r, expected %r" % (line, testline))
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try:
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lines = f.readlines()
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except ValueError:
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self.fail("readlines() after next() with supposedly empty "
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"iteration-buffer failed anyway")
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if lines != testlines:
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self.fail("readlines() after next() with empty buffer "
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"failed. Got %r, expected %r" % (line, testline))
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# Reading after iteration hit EOF shouldn't hurt either
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f = open(TESTFN)
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try:
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for line in f:
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pass
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try:
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f.readline()
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f.readinto(buf)
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f.read()
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f.readlines()
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except ValueError:
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self.fail("read* failed after next() consumed file")
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finally:
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f.close()
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finally:
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os.unlink(TESTFN)
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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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