cpython/Lib/test/test_os.py

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# As a test suite for the os module, this is woefully inadequate, but this
# does add tests for a few functions which have been determined to be more
# portable than they had been thought to be.
import os
import unittest
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import warnings
from test import test_support
warnings.filterwarnings("ignore", "tempnam", RuntimeWarning, __name__)
warnings.filterwarnings("ignore", "tmpnam", RuntimeWarning, __name__)
class TemporaryFileTests(unittest.TestCase):
def setUp(self):
self.files = []
os.mkdir(test_support.TESTFN)
def tearDown(self):
for name in self.files:
os.unlink(name)
os.rmdir(test_support.TESTFN)
def check_tempfile(self, name):
# make sure it doesn't already exist:
self.failIf(os.path.exists(name),
"file already exists for temporary file")
# make sure we can create the file
open(name, "w")
self.files.append(name)
def test_tempnam(self):
if not hasattr(os, "tempnam"):
return
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warnings.filterwarnings("ignore", "tempnam", RuntimeWarning,
r"test_os$")
self.check_tempfile(os.tempnam())
name = os.tempnam(test_support.TESTFN)
self.check_tempfile(name)
name = os.tempnam(test_support.TESTFN, "pfx")
self.assert_(os.path.basename(name)[:3] == "pfx")
self.check_tempfile(name)
def test_tmpfile(self):
if not hasattr(os, "tmpfile"):
return
fp = os.tmpfile()
fp.write("foobar")
fp.seek(0,0)
s = fp.read()
fp.close()
self.assert_(s == "foobar")
def test_tmpnam(self):
import sys
if not hasattr(os, "tmpnam"):
return
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warnings.filterwarnings("ignore", "tmpnam", RuntimeWarning,
r"test_os$")
name = os.tmpnam()
if sys.platform in ("win32",):
# The Windows tmpnam() seems useless. From the MS docs:
#
# The character string that tmpnam creates consists of
# the path prefix, defined by the entry P_tmpdir in the
# file STDIO.H, followed by a sequence consisting of the
# digit characters '0' through '9'; the numerical value
# of this string is in the range 1 - 65,535. Changing the
# definitions of L_tmpnam or P_tmpdir in STDIO.H does not
# change the operation of tmpnam.
#
# The really bizarre part is that, at least under MSVC6,
# P_tmpdir is "\\". That is, the path returned refers to
# the root of the current drive. That's a terrible place to
# put temp files, and, depending on privileges, the user
# may not even be able to open a file in the root directory.
self.failIf(os.path.exists(name),
"file already exists for temporary file")
else:
self.check_tempfile(name)
# Test attributes on return values from os.*stat* family.
class StatAttributeTests(unittest.TestCase):
def setUp(self):
os.mkdir(test_support.TESTFN)
self.fname = os.path.join(test_support.TESTFN, "f1")
f = open(self.fname, 'wb')
f.write("ABC")
f.close()
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def tearDown(self):
os.unlink(self.fname)
os.rmdir(test_support.TESTFN)
def test_stat_attributes(self):
if not hasattr(os, "stat"):
return
import stat
result = os.stat(self.fname)
# Make sure direct access works
self.assertEquals(result[stat.ST_SIZE], 3)
self.assertEquals(result.st_size, 3)
import sys
# Make sure all the attributes are there
members = dir(result)
for name in dir(stat):
if name[:3] == 'ST_':
attr = name.lower()
self.assertEquals(getattr(result, attr),
result[getattr(stat, name)])
self.assert_(attr in members)
try:
result[200]
self.fail("No exception thrown")
except IndexError:
pass
# Make sure that assignment fails
try:
result.st_mode = 1
self.fail("No exception thrown")
except TypeError:
pass
try:
result.st_rdev = 1
self.fail("No exception thrown")
except (AttributeError, TypeError):
pass
try:
result.parrot = 1
self.fail("No exception thrown")
except AttributeError:
pass
# Use the stat_result constructor with a too-short tuple.
try:
result2 = os.stat_result((10,))
self.fail("No exception thrown")
except TypeError:
pass
# Use the constructr with a too-long tuple.
try:
result2 = os.stat_result((0,1,2,3,4,5,6,7,8,9,10,11,12,13,14))
except TypeError:
pass
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def test_statvfs_attributes(self):
if not hasattr(os, "statvfs"):
return
import statvfs
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try:
result = os.statvfs(self.fname)
except OSError, e:
# On AtheOS, glibc always returns ENOSYS
import errno
if e.errno == errno.ENOSYS:
return
# Make sure direct access works
self.assertEquals(result.f_bfree, result[statvfs.F_BFREE])
# Make sure all the attributes are there
members = dir(result)
for name in dir(statvfs):
if name[:2] == 'F_':
attr = name.lower()
self.assertEquals(getattr(result, attr),
result[getattr(statvfs, name)])
self.assert_(attr in members)
# Make sure that assignment really fails
try:
result.f_bfree = 1
self.fail("No exception thrown")
except TypeError:
pass
try:
result.parrot = 1
self.fail("No exception thrown")
except AttributeError:
pass
# Use the constructor with a too-short tuple.
try:
result2 = os.statvfs_result((10,))
self.fail("No exception thrown")
except TypeError:
pass
# Use the constructr with a too-long tuple.
try:
result2 = os.statvfs_result((0,1,2,3,4,5,6,7,8,9,10,11,12,13,14))
except TypeError:
pass
from test_userdict import TestMappingProtocol
class EnvironTests(TestMappingProtocol):
"""check that os.environ object conform to mapping protocol"""
_tested_class = None
def _reference(self):
return {"KEY1":"VALUE1", "KEY2":"VALUE2", "KEY3":"VALUE3"}
def _empty_mapping(self):
os.environ.clear()
return os.environ
def setUp(self):
self.__save = dict(os.environ)
os.environ.clear()
def tearDown(self):
os.environ.clear()
os.environ.update(self.__save)
class WalkTests(unittest.TestCase):
"""Tests for os.walk()."""
def test_traversal(self):
import os
from os.path import join
# Build:
# TESTFN/ a file kid and two directory kids
# tmp1
# SUB1/ a file kid and a directory kid
# tmp2
# SUB11/ no kids
# SUB2/ just a file kid
# tmp3
sub1_path = join(test_support.TESTFN, "SUB1")
sub11_path = join(sub1_path, "SUB11")
sub2_path = join(test_support.TESTFN, "SUB2")
tmp1_path = join(test_support.TESTFN, "tmp1")
tmp2_path = join(sub1_path, "tmp2")
tmp3_path = join(sub2_path, "tmp3")
# Create stuff.
os.makedirs(sub11_path)
os.makedirs(sub2_path)
for path in tmp1_path, tmp2_path, tmp3_path:
f = file(path, "w")
f.write("I'm " + path + " and proud of it. Blame test_os.\n")
f.close()
# Walk top-down.
all = list(os.walk(test_support.TESTFN))
self.assertEqual(len(all), 4)
# We can't know which order SUB1 and SUB2 will appear in.
# Not flipped: TESTFN, SUB1, SUB11, SUB2
# flipped: TESTFN, SUB2, SUB1, SUB11
flipped = all[0][1][0] != "SUB1"
all[0][1].sort()
self.assertEqual(all[0], (test_support.TESTFN, ["SUB1", "SUB2"], ["tmp1"]))
self.assertEqual(all[1 + flipped], (sub1_path, ["SUB11"], ["tmp2"]))
self.assertEqual(all[2 + flipped], (sub11_path, [], []))
self.assertEqual(all[3 - 2 * flipped], (sub2_path, [], ["tmp3"]))
# Prune the search.
all = []
for root, dirs, files in os.walk(test_support.TESTFN):
all.append((root, dirs, files))
# Don't descend into SUB1.
if 'SUB1' in dirs:
# Note that this also mutates the dirs we appended to all!
dirs.remove('SUB1')
self.assertEqual(len(all), 2)
self.assertEqual(all[0], (test_support.TESTFN, ["SUB2"], ["tmp1"]))
self.assertEqual(all[1], (sub2_path, [], ["tmp3"]))
# Walk bottom-up.
all = list(os.walk(test_support.TESTFN, topdown=False))
self.assertEqual(len(all), 4)
# We can't know which order SUB1 and SUB2 will appear in.
# Not flipped: SUB11, SUB1, SUB2, TESTFN
# flipped: SUB2, SUB11, SUB1, TESTFN
flipped = all[3][1][0] != "SUB1"
all[3][1].sort()
self.assertEqual(all[3], (test_support.TESTFN, ["SUB1", "SUB2"], ["tmp1"]))
self.assertEqual(all[flipped], (sub11_path, [], []))
self.assertEqual(all[flipped + 1], (sub1_path, ["SUB11"], ["tmp2"]))
self.assertEqual(all[2 - 2 * flipped], (sub2_path, [], ["tmp3"]))
# Tear everything down. This is a decent use for bottom-up on
# Windows, which doesn't have a recursive delete command. The
# (not so) subtlety is that rmdir will fail unless the dir's
# kids are removed first, so bottom up is essential.
for root, dirs, files in os.walk(test_support.TESTFN, topdown=False):
for name in files:
os.remove(join(root, name))
for name in dirs:
os.rmdir(join(root, name))
os.rmdir(test_support.TESTFN)
class MakedirTests (unittest.TestCase):
def setUp(self):
os.mkdir(test_support.TESTFN)
def test_makedir(self):
base = test_support.TESTFN
path = os.path.join(base, 'dir1', 'dir2', 'dir3')
os.makedirs(path) # Should work
path = os.path.join(base, 'dir1', 'dir2', 'dir3', 'dir4')
os.makedirs(path)
# Try paths with a '.' in them
self.failUnlessRaises(OSError, os.makedirs, os.curdir)
path = os.path.join(base, 'dir1', 'dir2', 'dir3', 'dir4', 'dir5', os.curdir)
os.makedirs(path)
path = os.path.join(base, 'dir1', os.curdir, 'dir2', 'dir3', 'dir4',
'dir5', 'dir6')
os.makedirs(path)
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def tearDown(self):
path = os.path.join(test_support.TESTFN, 'dir1', 'dir2', 'dir3',
'dir4', 'dir5', 'dir6')
# If the tests failed, the bottom-most directory ('../dir6')
# may not have been created, so we look for the outermost directory
# that exists.
while not os.path.exists(path) and path != test_support.TESTFN:
path = os.path.dirname(path)
os.removedirs(path)
def test_main():
test_support.run_unittest(
TemporaryFileTests,
StatAttributeTests,
EnvironTests,
WalkTests,
MakedirTests,
)
if __name__ == "__main__":
test_main()