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9cdfa4c98c
like cause the interpreter to exit abruptly. If there's a way to fix this, it would be good to really fix it. It could just be the operation of the std C library and we just aren't supposed to do that. When the test case is skipped, we print a message so the user can check for themselves.
345 lines
9.6 KiB
Python
345 lines
9.6 KiB
Python
import sys
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import os
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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 verify, TESTFN, TestFailed, findfile
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from UserList import UserList
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# verify weak references
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f = file(TESTFN, 'w')
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p = proxy(f)
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p.write('teststring')
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verify(f.tell(), p.tell())
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f.close()
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f = None
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try:
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p.tell()
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except ReferenceError:
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pass
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else:
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raise TestFailed('file proxy still exists when the file is gone')
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# verify expected attributes exist
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f = file(TESTFN, 'w')
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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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try:
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setattr(f, attr, 'oops')
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except (AttributeError, TypeError):
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pass
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else:
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raise TestFailed('expected exception setting file attr %r' % attr)
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f.close()
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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 = file(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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raise TestFailed('%r is an invalid file mode' % mode)
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# verify writelines with instance sequence
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l = UserList(['1', '2'])
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f = open(TESTFN, 'wb')
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f.writelines(l)
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f.close()
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f = open(TESTFN, 'rb')
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buf = f.read()
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f.close()
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verify(buf == '12')
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# verify readinto
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a = array('c', 'x'*10)
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f = open(TESTFN, 'rb')
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n = f.readinto(a)
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f.close()
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verify(buf == a.tostring()[:n])
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# verify writelines with integers
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f = open(TESTFN, 'wb')
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try:
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f.writelines([1, 2, 3])
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except TypeError:
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pass
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else:
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print "writelines accepted sequence of integers"
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f.close()
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# verify writelines with integers in UserList
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f = open(TESTFN, 'wb')
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l = UserList([1,2,3])
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try:
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f.writelines(l)
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except TypeError:
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pass
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else:
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print "writelines accepted sequence of integers"
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f.close()
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# verify writelines with non-string object
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class NonString: pass
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f = open(TESTFN, 'wb')
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try:
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f.writelines([NonString(), NonString()])
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except TypeError:
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pass
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else:
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print "writelines accepted sequence of non-string objects"
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f.close()
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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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try:
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sys.stdin.seek(-1)
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except IOError:
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pass
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else:
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print "should not be able to seek on sys.stdin"
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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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try:
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sys.stdin.truncate()
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except IOError:
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pass
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else:
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print "should not be able to truncate on sys.stdin"
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# verify repr works
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f = open(TESTFN)
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if not repr(f).startswith("<open file '" + TESTFN):
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print "repr(file) failed"
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f.close()
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# verify repr works for unicode too
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f = open(unicode(TESTFN))
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if not repr(f).startswith("<open file u'" + TESTFN):
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print "repr(file with unicode name) failed"
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f.close()
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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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open(TESTFN, bad_mode)
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except IOError, 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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print "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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print "no error for invalid mode: %s" % bad_mode
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f = open(TESTFN)
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if f.name != TESTFN:
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raise TestFailed, 'file.name should be "%s"' % TESTFN
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if f.isatty():
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raise TestFailed, 'file.isatty() should be false'
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if f.closed:
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raise TestFailed, 'file.closed should be false'
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try:
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f.readinto("")
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except TypeError:
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pass
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else:
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raise TestFailed, 'file.readinto("") should raise a TypeError'
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f.close()
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if not f.closed:
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raise TestFailed, 'file.closed should be true'
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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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raise TestFailed, 'error setting buffer size %d: %s' % (s, str(msg))
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if d != s:
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raise TestFailed, 'readback failure using buffer size %d'
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methods = ['fileno', 'flush', 'isatty', 'next', 'read', 'readinto',
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'readline', 'readlines', 'seek', 'tell', 'truncate', 'write',
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'xreadlines', '__iter__']
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if sys.platform.startswith('atheos'):
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methods.remove('truncate')
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for methodname in methods:
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method = getattr(f, methodname)
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try:
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method()
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except ValueError:
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pass
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else:
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raise TestFailed, 'file.%s() on a closed file should raise a ValueError' % methodname
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try:
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f.writelines([])
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except ValueError:
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pass
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else:
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raise TestFailed, 'file.writelines([]) on a closed file should raise a ValueError'
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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 = file(TESTFN, 'wb')
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f.write('12345678901') # 11 bytes
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f.close()
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f = file(TESTFN,'rb+')
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data = f.read(5)
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if data != '12345':
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raise TestFailed("Read on file opened for update failed %r" % data)
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if f.tell() != 5:
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raise TestFailed("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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raise TestFailed("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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raise TestFailed("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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# Test the complex interaction when mixing file-iteration and the various
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# read* methods. Ostensibly, the mixture could just be tested to work
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# when it should work according to the Python language, instead of fail
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# when it should fail according to the current CPython implementation.
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# People don't always program Python the way they should, though, and the
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# implemenation might change in subtle ways, so we explicitly test for
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# errors, too; the test will just have to be updated when the
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# 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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raise TestFailed, "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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raise TestFailed("%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 iteration
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# still works. This depends on the size of the internal iteration
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# buffer (currently 8192,) but we can test it in a flexible manner.
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# Each line in the bag o' ham is 4 bytes ("h", "a", "m", "\n"), so
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# 4096 lines of that should get us exactly on the buffer boundary for
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# any power-of-2 buffersize 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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raise TestFailed("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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raise TestFailed("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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raise TestFailed("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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raise TestFailed("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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raise TestFailed("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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raise TestFailed("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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raise TestFailed("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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raise TestFailed("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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raise TestFailed("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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