lib-python.2.5.test.test_file.py Maven / Gradle / Ivy
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Jython is an implementation of the high-level, dynamic, object-oriented
language Python written in 100% Pure Java, and seamlessly integrated with
the Java platform. It thus allows you to run Python on any Java platform.
import sys
import os
import unittest
from array import array
from weakref import proxy
from test.test_support import TESTFN, findfile, run_unittest
from UserList import UserList
class AutoFileTests(unittest.TestCase):
# file tests for which a test file is automatically set up
def setUp(self):
self.f = open(TESTFN, 'wb')
def tearDown(self):
if self.f:
self.f.close()
os.remove(TESTFN)
def testWeakRefs(self):
# verify weak references
p = proxy(self.f)
p.write('teststring')
self.assertEquals(self.f.tell(), p.tell())
self.f.close()
self.f = None
self.assertRaises(ReferenceError, getattr, p, 'tell')
def testAttributes(self):
# verify expected attributes exist
f = self.f
softspace = f.softspace
f.name # merely shouldn't blow up
f.mode # ditto
f.closed # ditto
# verify softspace is writable
f.softspace = softspace # merely shouldn't blow up
# verify the others aren't
for attr in 'name', 'mode', 'closed':
self.assertRaises((AttributeError, TypeError), setattr, f, attr, 'oops')
def testReadinto(self):
# verify readinto
self.f.write('12')
self.f.close()
a = array('c', 'x'*10)
self.f = open(TESTFN, 'rb')
n = self.f.readinto(a)
self.assertEquals('12', a.tostring()[:n])
def testWritelinesUserList(self):
# verify writelines with instance sequence
l = UserList(['1', '2'])
self.f.writelines(l)
self.f.close()
self.f = open(TESTFN, 'rb')
buf = self.f.read()
self.assertEquals(buf, '12')
def testWritelinesIntegers(self):
# verify writelines with integers
self.assertRaises(TypeError, self.f.writelines, [1, 2, 3])
def testWritelinesIntegersUserList(self):
# verify writelines with integers in UserList
l = UserList([1,2,3])
self.assertRaises(TypeError, self.f.writelines, l)
def testWritelinesNonString(self):
# verify writelines with non-string object
class NonString:
pass
self.assertRaises(TypeError, self.f.writelines,
[NonString(), NonString()])
def testRepr(self):
# verify repr works
self.assert_(repr(self.f).startswith(">sys.__stdout__, (
' Skipping sys.stdin.seek(-1), it may crash the interpreter.'
' Test manually.')
self.assertRaises(IOError, sys.stdin.truncate)
def testUnicodeOpen(self):
# verify repr works for unicode too
f = open(unicode(TESTFN), "w")
self.assert_(repr(f).startswith("
# "file.truncate fault on windows"
f = open(TESTFN, 'wb')
f.write('12345678901') # 11 bytes
f.close()
f = open(TESTFN,'rb+')
data = f.read(5)
if data != '12345':
self.fail("Read on file opened for update failed %r" % data)
if f.tell() != 5:
self.fail("File pos after read wrong %d" % f.tell())
f.truncate()
if f.tell() != 5:
self.fail("File pos after ftruncate wrong %d" % f.tell())
f.close()
size = os.path.getsize(TESTFN)
if size != 5:
self.fail("File size after ftruncate wrong %d" % size)
try:
bug801631()
finally:
os.unlink(TESTFN)
def testIteration(self):
# Test the complex interaction when mixing file-iteration and the
# various read* methods. Ostensibly, the mixture could just be tested
# to work when it should work according to the Python language,
# instead of fail when it should fail according to the current CPython
# implementation. People don't always program Python the way they
# should, though, and the implemenation might change in subtle ways,
# so we explicitly test for errors, too; the test will just have to
# be updated when the implementation changes.
dataoffset = 16384
filler = "ham\n"
assert not dataoffset % len(filler), \
"dataoffset must be multiple of len(filler)"
nchunks = dataoffset // len(filler)
testlines = [
"spam, spam and eggs\n",
"eggs, spam, ham and spam\n",
"saussages, spam, spam and eggs\n",
"spam, ham, spam and eggs\n",
"spam, spam, spam, spam, spam, ham, spam\n",
"wonderful spaaaaaam.\n"
]
methods = [("readline", ()), ("read", ()), ("readlines", ()),
("readinto", (array("c", " "*100),))]
try:
# Prepare the testfile
bag = open(TESTFN, "w")
bag.write(filler * nchunks)
bag.writelines(testlines)
bag.close()
# Test for appropriate errors mixing read* and iteration
for methodname, args in methods:
f = open(TESTFN)
if f.next() != filler:
self.fail, "Broken testfile"
meth = getattr(f, methodname)
try:
meth(*args)
except ValueError:
pass
else:
self.fail("%s%r after next() didn't raise ValueError" %
(methodname, args))
f.close()
# Test to see if harmless (by accident) mixing of read* and
# iteration still works. This depends on the size of the internal
# iteration buffer (currently 8192,) but we can test it in a
# flexible manner. Each line in the bag o' ham is 4 bytes
# ("h", "a", "m", "\n"), so 4096 lines of that should get us
# exactly on the buffer boundary for any power-of-2 buffersize
# between 4 and 16384 (inclusive).
f = open(TESTFN)
for i in range(nchunks):
f.next()
testline = testlines.pop(0)
try:
line = f.readline()
except ValueError:
self.fail("readline() after next() with supposedly empty "
"iteration-buffer failed anyway")
if line != testline:
self.fail("readline() after next() with empty buffer "
"failed. Got %r, expected %r" % (line, testline))
testline = testlines.pop(0)
buf = array("c", "\x00" * len(testline))
try:
f.readinto(buf)
except ValueError:
self.fail("readinto() after next() with supposedly empty "
"iteration-buffer failed anyway")
line = buf.tostring()
if line != testline:
self.fail("readinto() after next() with empty buffer "
"failed. Got %r, expected %r" % (line, testline))
testline = testlines.pop(0)
try:
line = f.read(len(testline))
except ValueError:
self.fail("read() after next() with supposedly empty "
"iteration-buffer failed anyway")
if line != testline:
self.fail("read() after next() with empty buffer "
"failed. Got %r, expected %r" % (line, testline))
try:
lines = f.readlines()
except ValueError:
self.fail("readlines() after next() with supposedly empty "
"iteration-buffer failed anyway")
if lines != testlines:
self.fail("readlines() after next() with empty buffer "
"failed. Got %r, expected %r" % (line, testline))
# Reading after iteration hit EOF shouldn't hurt either
f = open(TESTFN)
try:
for line in f:
pass
try:
f.readline()
f.readinto(buf)
f.read()
f.readlines()
except ValueError:
self.fail("read* failed after next() consumed file")
finally:
f.close()
finally:
os.unlink(TESTFN)
class StdoutTests(unittest.TestCase):
def test_move_stdout_on_write(self):
# Issue 3242: sys.stdout can be replaced (and freed) during a
# print statement; prevent a segfault in this case
save_stdout = sys.stdout
class File:
def write(self, data):
if '\n' in data:
sys.stdout = save_stdout
try:
sys.stdout = File()
print "some text"
finally:
sys.stdout = save_stdout
def test_del_stdout_before_print(self):
# Issue 4597: 'print' with no argument wasn't reporting when
# sys.stdout was deleted.
save_stdout = sys.stdout
del sys.stdout
try:
print
except RuntimeError, e:
self.assertEquals(str(e), "lost sys.stdout")
else:
self.fail("Expected RuntimeError")
finally:
sys.stdout = save_stdout
def test_main():
# Historically, these tests have been sloppy about removing TESTFN.
# So get rid of it no matter what.
try:
run_unittest(AutoFileTests, OtherFileTests, StdoutTests)
finally:
if os.path.exists(TESTFN):
os.unlink(TESTFN)
if __name__ == '__main__':
test_main()