cpython/Lib/test/test_support.py at 22c60b53ae24512ebaab656c542a4e8d4a6785fc · Eclips4/cpython

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import errno

import importlib

import io

import os

import shutil

import socket

import stat

import subprocess

import sys

import tempfile

import textwrap

import unittest

import warnings

from test import support

from test.support import import_helper

from test.support import os_helper

from test.support import script_helper

from test.support import socket_helper

from test.support import warnings_helper

TESTFN = os_helper.TESTFN

class TestSupport(unittest.TestCase):

@classmethod

def setUpClass(cls):

orig_filter_len = len(warnings.filters)

cls._warnings_helper_token = support.ignore_deprecations_from(

"test.support.warnings_helper", like=".*used in test_support.*"

)

cls._test_support_token = support.ignore_deprecations_from(

__name__, like=".*You should NOT be seeing this.*"

)

assert len(warnings.filters) == orig_filter_len + 2

@classmethod

def tearDownClass(cls):

orig_filter_len = len(warnings.filters)

support.clear_ignored_deprecations(

cls._warnings_helper_token,

cls._test_support_token,

)

assert len(warnings.filters) == orig_filter_len - 2

def test_ignored_deprecations_are_silent(self):

"""Test support.ignore_deprecations_from() silences warnings"""

with warnings.catch_warnings(record=True) as warning_objs:

warnings_helper._warn_about_deprecation()

warnings.warn("You should NOT be seeing this.", DeprecationWarning)

messages = [str(w.message) for w in warning_objs]

self.assertEqual(len(messages), 0, messages)

def test_import_module(self):

import_helper.import_module("ftplib")

self.assertRaises(unittest.SkipTest,

import_helper.import_module, "foo")

def test_import_fresh_module(self):

import_helper.import_fresh_module("ftplib")

def test_get_attribute(self):

self.assertEqual(support.get_attribute(self, "test_get_attribute"),

self.test_get_attribute)

self.assertRaises(unittest.SkipTest, support.get_attribute, self, "foo")

@unittest.skip("failing buildbots")

def test_get_original_stdout(self):

self.assertEqual(support.get_original_stdout(), sys.stdout)

def test_unload(self):

import sched

self.assertIn("sched", sys.modules)

import_helper.unload("sched")

self.assertNotIn("sched", sys.modules)

def test_unlink(self):

with open(TESTFN, "w", encoding="utf-8") as f:

pass

os_helper.unlink(TESTFN)

self.assertFalse(os.path.exists(TESTFN))

os_helper.unlink(TESTFN)

def test_rmtree(self):

dirpath = os_helper.TESTFN + 'd'

subdirpath = os.path.join(dirpath, 'subdir')

os.mkdir(dirpath)

os.mkdir(subdirpath)

os_helper.rmtree(dirpath)

self.assertFalse(os.path.exists(dirpath))

with support.swap_attr(support, 'verbose', 0):

os_helper.rmtree(dirpath)

os.mkdir(dirpath)

os.mkdir(subdirpath)

os.chmod(dirpath, stat.S_IRUSR|stat.S_IXUSR)

with support.swap_attr(support, 'verbose', 0):

os_helper.rmtree(dirpath)

self.assertFalse(os.path.exists(dirpath))

os.mkdir(dirpath)

os.mkdir(subdirpath)

os.chmod(dirpath, 0)

with support.swap_attr(support, 'verbose', 0):

os_helper.rmtree(dirpath)

self.assertFalse(os.path.exists(dirpath))

def test_forget(self):

mod_filename = TESTFN + '.py'

with open(mod_filename, 'w', encoding="utf-8") as f:

print('foo = 1', file=f)

sys.path.insert(0, os.curdir)

importlib.invalidate_caches()

try:

mod = __import__(TESTFN)

self.assertIn(TESTFN, sys.modules)

import_helper.forget(TESTFN)

self.assertNotIn(TESTFN, sys.modules)

finally:

del sys.path[0]

os_helper.unlink(mod_filename)

os_helper.rmtree('__pycache__')

@support.requires_working_socket()

def test_HOST(self):

s = socket.create_server((socket_helper.HOST, 0))

s.close()

@support.requires_working_socket()

def test_find_unused_port(self):

port = socket_helper.find_unused_port()

s = socket.create_server((socket_helper.HOST, port))

s.close()

@support.requires_working_socket()

def test_bind_port(self):

s = socket.socket()

socket_helper.bind_port(s)

s.listen()

s.close()

# Tests for temp_dir()

def test_temp_dir(self):

"""Test that temp_dir() creates and destroys its directory."""

parent_dir = tempfile.mkdtemp()

parent_dir = os.path.realpath(parent_dir)

try:

path = os.path.join(parent_dir, 'temp')

self.assertFalse(os.path.isdir(path))

with os_helper.temp_dir(path) as temp_path:

self.assertEqual(temp_path, path)

self.assertTrue(os.path.isdir(path))

self.assertFalse(os.path.isdir(path))

finally:

os_helper.rmtree(parent_dir)

def test_temp_dir__path_none(self):

"""Test passing no path."""

with os_helper.temp_dir() as temp_path:

self.assertTrue(os.path.isdir(temp_path))

self.assertFalse(os.path.isdir(temp_path))

def test_temp_dir__existing_dir__quiet_default(self):

"""Test passing a directory that already exists."""

def call_temp_dir(path):

with os_helper.temp_dir(path) as temp_path:

raise Exception("should not get here")

path = tempfile.mkdtemp()

path = os.path.realpath(path)

try:

self.assertTrue(os.path.isdir(path))

self.assertRaises(FileExistsError, call_temp_dir, path)

# Make sure temp_dir did not delete the original directory.

self.assertTrue(os.path.isdir(path))

finally:

shutil.rmtree(path)

def test_temp_dir__existing_dir__quiet_true(self):

"""Test passing a directory that already exists with quiet=True."""

path = tempfile.mkdtemp()

path = os.path.realpath(path)

try:

with warnings_helper.check_warnings() as recorder:

with os_helper.temp_dir(path, quiet=True) as temp_path:

self.assertEqual(path, temp_path)

warnings = [str(w.message) for w in recorder.warnings]

# Make sure temp_dir did not delete the original directory.

self.assertTrue(os.path.isdir(path))

finally:

shutil.rmtree(path)

self.assertEqual(len(warnings), 1, warnings)

warn = warnings[0]

self.assertTrue(warn.startswith(f'tests may fail, unable to create '

f'temporary directory {path!r}: '),

warn)

@support.requires_fork()

def test_temp_dir__forked_child(self):

"""Test that a forked child process does not remove the directory."""

# See bpo-30028 for details.

# Run the test as an external script, because it uses fork.

script_helper.assert_python_ok("-c", textwrap.dedent("""

import os

from test import support

from test.support import os_helper

with os_helper.temp_cwd() as temp_path:

pid = os.fork()

if pid != 0:

# parent process

# wait for the child to terminate

support.wait_process(pid, exitcode=0)

# Make sure that temp_path is still present. When the child

# process leaves the 'temp_cwd'-context, the __exit__()-

# method of the context must not remove the temporary

# directory.

if not os.path.isdir(temp_path):

raise AssertionError("Child removed temp_path.")

"""))

# Tests for change_cwd()

def test_change_cwd(self):

original_cwd = os.getcwd()

with os_helper.temp_dir() as temp_path:

with os_helper.change_cwd(temp_path) as new_cwd:

self.assertEqual(new_cwd, temp_path)

self.assertEqual(os.getcwd(), new_cwd)

self.assertEqual(os.getcwd(), original_cwd)

def test_change_cwd__non_existent_dir(self):

"""Test passing a non-existent directory."""

original_cwd = os.getcwd()

def call_change_cwd(path):

with os_helper.change_cwd(path) as new_cwd:

raise Exception("should not get here")

with os_helper.temp_dir() as parent_dir:

non_existent_dir = os.path.join(parent_dir, 'does_not_exist')

self.assertRaises(FileNotFoundError, call_change_cwd,

non_existent_dir)

self.assertEqual(os.getcwd(), original_cwd)

def test_change_cwd__non_existent_dir__quiet_true(self):

"""Test passing a non-existent directory with quiet=True."""

original_cwd = os.getcwd()

with os_helper.temp_dir() as parent_dir:

bad_dir = os.path.join(parent_dir, 'does_not_exist')

with warnings_helper.check_warnings() as recorder:

with os_helper.change_cwd(bad_dir, quiet=True) as new_cwd:

self.assertEqual(new_cwd, original_cwd)

self.assertEqual(os.getcwd(), new_cwd)

warnings = [str(w.message) for w in recorder.warnings]

self.assertEqual(len(warnings), 1, warnings)

warn = warnings[0]

self.assertTrue(warn.startswith(f'tests may fail, unable to change '

f'the current working directory '

f'to {bad_dir!r}: '),

warn)

# Tests for change_cwd()

def test_change_cwd__chdir_warning(self):

"""Check the warning message when os.chdir() fails."""

path = TESTFN + '_does_not_exist'

with warnings_helper.check_warnings() as recorder:

with os_helper.change_cwd(path=path, quiet=True):

pass

messages = [str(w.message) for w in recorder.warnings]

self.assertEqual(len(messages), 1, messages)

msg = messages[0]

self.assertTrue(msg.startswith(f'tests may fail, unable to change '

f'the current working directory '

f'to {path!r}: '),

msg)

# Tests for temp_cwd()

def test_temp_cwd(self):

here = os.getcwd()

with os_helper.temp_cwd(name=TESTFN):

self.assertEqual(os.path.basename(os.getcwd()), TESTFN)

self.assertFalse(os.path.exists(TESTFN))

self.assertEqual(os.getcwd(), here)

def test_temp_cwd__name_none(self):

"""Test passing None to temp_cwd()."""

original_cwd = os.getcwd()

with os_helper.temp_cwd(name=None) as new_cwd:

self.assertNotEqual(new_cwd, original_cwd)

self.assertTrue(os.path.isdir(new_cwd))

self.assertEqual(os.getcwd(), new_cwd)

self.assertEqual(os.getcwd(), original_cwd)

def test_sortdict(self):

self.assertEqual(support.sortdict({3:3, 2:2, 1:1}), "{1: 1, 2: 2, 3: 3}")

def test_make_bad_fd(self):

fd = os_helper.make_bad_fd()

with self.assertRaises(OSError) as cm:

os.write(fd, b"foo")

self.assertEqual(cm.exception.errno, errno.EBADF)

def test_check_syntax_error(self):

support.check_syntax_error(self, "def class", lineno=1, offset=5)

with self.assertRaises(AssertionError):

support.check_syntax_error(self, "x=1")

def test_CleanImport(self):

import importlib

with import_helper.CleanImport("pprint"):

importlib.import_module("pprint")

def test_DirsOnSysPath(self):

with import_helper.DirsOnSysPath('foo', 'bar'):

self.assertIn("foo", sys.path)

self.assertIn("bar", sys.path)

self.assertNotIn("foo", sys.path)

self.assertNotIn("bar", sys.path)

def test_captured_stdout(self):

with support.captured_stdout() as stdout:

print("hello")

self.assertEqual(stdout.getvalue(), "hello\n")

def test_captured_stderr(self):

with support.captured_stderr() as stderr:

print("hello", file=sys.stderr)

self.assertEqual(stderr.getvalue(), "hello\n")

def test_captured_stdin(self):

with support.captured_stdin() as stdin:

stdin.write('hello\n')

stdin.seek(0)

# call test code that consumes from sys.stdin

captured = input()

self.assertEqual(captured, "hello")

def test_gc_collect(self):

support.gc_collect()

def test_python_is_optimized(self):

self.assertIsInstance(support.python_is_optimized(), bool)

def test_swap_attr(self):

class Obj:

pass

obj = Obj()

obj.x = 1

with support.swap_attr(obj, "x", 5) as x:

self.assertEqual(obj.x, 5)

self.assertEqual(x, 1)

self.assertEqual(obj.x, 1)

with support.swap_attr(obj, "y", 5) as y:

self.assertEqual(obj.y, 5)

self.assertIsNone(y)

self.assertFalse(hasattr(obj, 'y'))

with support.swap_attr(obj, "y", 5):

del obj.y

self.assertFalse(hasattr(obj, 'y'))

def test_swap_item(self):

D = {"x":1}

with support.swap_item(D, "x", 5) as x:

self.assertEqual(D["x"], 5)

self.assertEqual(x, 1)

self.assertEqual(D["x"], 1)

with support.swap_item(D, "y", 5) as y:

self.assertEqual(D["y"], 5)

self.assertIsNone(y)

self.assertNotIn("y", D)

with support.swap_item(D, "y", 5):

del D["y"]

self.assertNotIn("y", D)

class RefClass:

attribute1 = None

attribute2 = None

_hidden_attribute1 = None

__magic_1__ = None

class OtherClass:

attribute2 = None

attribute3 = None

__magic_1__ = None

__magic_2__ = None

def test_detect_api_mismatch(self):

missing_items = support.detect_api_mismatch(self.RefClass,

self.OtherClass)

self.assertEqual({'attribute1'}, missing_items)

missing_items = support.detect_api_mismatch(self.OtherClass,

self.RefClass)

self.assertEqual({'attribute3', '__magic_2__'}, missing_items)

def test_detect_api_mismatch__ignore(self):

ignore = ['attribute1', 'attribute3', '__magic_2__', 'not_in_either']

missing_items = support.detect_api_mismatch(

self.RefClass, self.OtherClass, ignore=ignore)

self.assertEqual(set(), missing_items)

missing_items = support.detect_api_mismatch(

self.OtherClass, self.RefClass, ignore=ignore)

self.assertEqual(set(), missing_items)

def test_check__all__(self):

extra = {'tempdir'}

not_exported = {'template'}

support.check__all__(self,

tempfile,

extra=extra,

not_exported=not_exported)

extra = {

'TextTestResult',

'findTestCases',

'getTestCaseNames',

'installHandler',

'makeSuite',

}

not_exported = {'load_tests', "TestProgram", "BaseTestSuite"}

support.check__all__(self,

unittest,

("unittest.result", "unittest.case",

"unittest.suite", "unittest.loader",

"unittest.main", "unittest.runner",

"unittest.signals", "unittest.async_case"),

extra=extra,

not_exported=not_exported)

self.assertRaises(AssertionError, support.check__all__, self, unittest)

@unittest.skipUnless(hasattr(os, 'waitpid') and hasattr(os, 'WNOHANG'),

'need os.waitpid() and os.WNOHANG')

@support.requires_fork()

def test_reap_children(self):

# Make sure that there is no other pending child process

support.reap_children()

# Create a child process

pid = os.fork()

if pid == 0:

# child process: do nothing, just exit

os._exit(0)

was_altered = support.environment_altered

try:

support.environment_altered = False

stderr = io.StringIO()

for _ in support.sleeping_retry(support.SHORT_TIMEOUT):

with support.swap_attr(support.print_warning, 'orig_stderr', stderr):

support.reap_children()

# Use environment_altered to check if reap_children() found

# the child process

if support.environment_altered:

break

msg = "Warning -- reap_children() reaped child process %s" % pid

self.assertIn(msg, stderr.getvalue())

self.assertTrue(support.environment_altered)

finally:

support.environment_altered = was_altered

# Just in case, check again that there is no other

# pending child process

support.reap_children()

@support.requires_subprocess()

def check_options(self, args, func, expected=None):

code = f'from test.support import {func}; print(repr({func}()))'

cmd = [sys.executable, *args, '-c', code]

env = {key: value for key, value in os.environ.items()

if not key.startswith('PYTHON')}

proc = subprocess.run(cmd,

stdout=subprocess.PIPE,

stderr=subprocess.DEVNULL,

universal_newlines=True,

env=env)

if expected is None:

expected = args

self.assertEqual(proc.stdout.rstrip(), repr(expected))

self.assertEqual(proc.returncode, 0)

def test_args_from_interpreter_flags(self):

# Test test.support.args_from_interpreter_flags()

for opts in (

# no option

[],

# single option

['-B'],

['-s'],

['-S'],

['-E'],

['-v'],

['-b'],

['-P'],

['-q'],

['-I'],

# same option multiple times

['-bb'],

['-vvv'],

# -W options

['-Wignore'],

# -X options

['-X', 'dev'],

['-Wignore', '-X', 'dev'],

['-X', 'faulthandler'],

['-X', 'importtime'],

['-X', 'showrefcount'],

['-X', 'tracemalloc'],

['-X', 'tracemalloc=3'],

with self.subTest(opts=opts):

self.check_options(opts, 'args_from_interpreter_flags')

self.check_options(['-I', '-E', '-s', '-P'],

'args_from_interpreter_flags',

['-I'])

def test_optim_args_from_interpreter_flags(self):

# Test test.support.optim_args_from_interpreter_flags()

for opts in (

# no option

[],

['-O'],

['-OO'],

['-OOOO'],

with self.subTest(opts=opts):

self.check_options(opts, 'optim_args_from_interpreter_flags')

def test_match_test(self):

class Test:

def __init__(self, test_id):

self.test_id = test_id

def id(self):

return self.test_id

test_access = Test('test.test_os.FileTests.test_access')

test_chdir = Test('test.test_os.Win32ErrorTests.test_chdir')

# Test acceptance

with support.swap_attr(support, '_match_test_func', None):

# match all

support.set_match_tests([])

self.assertTrue(support.match_test(test_access))

self.assertTrue(support.match_test(test_chdir))

# match all using None

support.set_match_tests(None, None)

self.assertTrue(support.match_test(test_access))

self.assertTrue(support.match_test(test_chdir))

# match the full test identifier

support.set_match_tests([test_access.id()], None)

self.assertTrue(support.match_test(test_access))

self.assertFalse(support.match_test(test_chdir))

# match the module name

support.set_match_tests(['test_os'], None)

self.assertTrue(support.match_test(test_access))

self.assertTrue(support.match_test(test_chdir))

# Test '*' pattern

support.set_match_tests(['test_*'], None)

self.assertTrue(support.match_test(test_access))

self.assertTrue(support.match_test(test_chdir))

# Test case sensitivity

support.set_match_tests(['filetests'], None)

self.assertFalse(support.match_test(test_access))

support.set_match_tests(['FileTests'], None)

self.assertTrue(support.match_test(test_access))

# Test pattern containing '.' and a '*' metacharacter

support.set_match_tests(['*test_os.*.test_*'], None)

self.assertTrue(support.match_test(test_access))

self.assertTrue(support.match_test(test_chdir))

# Multiple patterns

support.set_match_tests([test_access.id(), test_chdir.id()], None)

self.assertTrue(support.match_test(test_access))

self.assertTrue(support.match_test(test_chdir))

support.set_match_tests(['test_access', 'DONTMATCH'], None)

self.assertTrue(support.match_test(test_access))

self.assertFalse(support.match_test(test_chdir))

# Test rejection

with support.swap_attr(support, '_match_test_func', None):

# match all

support.set_match_tests(ignore_patterns=[])

self.assertTrue(support.match_test(test_access))

self.assertTrue(support.match_test(test_chdir))

# match all using None

support.set_match_tests(None, None)

self.assertTrue(support.match_test(test_access))

self.assertTrue(support.match_test(test_chdir))

# match the full test identifier

support.set_match_tests(None, [test_access.id()])

self.assertFalse(support.match_test(test_access))

self.assertTrue(support.match_test(test_chdir))

# match the module name

support.set_match_tests(None, ['test_os'])

self.assertFalse(support.match_test(test_access))

self.assertFalse(support.match_test(test_chdir))

# Test '*' pattern

support.set_match_tests(None, ['test_*'])

self.assertFalse(support.match_test(test_access))

self.assertFalse(support.match_test(test_chdir))

# Test case sensitivity

support.set_match_tests(None, ['filetests'])

self.assertTrue(support.match_test(test_access))

support.set_match_tests(None, ['FileTests'])

self.assertFalse(support.match_test(test_access))

# Test pattern containing '.' and a '*' metacharacter

support.set_match_tests(None, ['*test_os.*.test_*'])

self.assertFalse(support.match_test(test_access))

self.assertFalse(support.match_test(test_chdir))

# Multiple patterns

support.set_match_tests(None, [test_access.id(), test_chdir.id()])

self.assertFalse(support.match_test(test_access))

self.assertFalse(support.match_test(test_chdir))

support.set_match_tests(None, ['test_access', 'DONTMATCH'])

self.assertFalse(support.match_test(test_access))

self.assertTrue(support.match_test(test_chdir))

@unittest.skipIf(support.is_emscripten, "Unstable in Emscripten")

@unittest.skipIf(support.is_wasi, "Unavailable on WASI")

def test_fd_count(self):

# We cannot test the absolute value of fd_count(): on old Linux

# kernel or glibc versions, os.urandom() keeps a FD open on

# /dev/urandom device and Python has 4 FD opens instead of 3.

# Test is unstable on Emscripten. The platform starts and stops

# background threads that use pipes and epoll fds.

start = os_helper.fd_count()

fd = os.open(__file__, os.O_RDONLY)

try:

more = os_helper.fd_count()

finally:

os.close(fd)

self.assertEqual(more - start, 1)

def check_print_warning(self, msg, expected):

stderr = io.StringIO()

with support.swap_attr(support.print_warning, 'orig_stderr', stderr):

support.print_warning(msg)

self.assertEqual(stderr.getvalue(), expected)

def test_print_warning(self):

self.check_print_warning("msg",

"Warning -- msg\n")

self.check_print_warning("a\nb",

'Warning -- a\nWarning -- b\n')

def test_has_strftime_extensions(self):

if support.is_emscripten or sys.platform == "win32":

self.assertFalse(support.has_strftime_extensions)

else:

self.assertTrue(support.has_strftime_extensions)

# XXX -follows a list of untested API

# make_legacy_pyc

# is_resource_enabled

# requires

# fcmp

# umaks

# findfile

# check_warnings

# EnvironmentVarGuard

# transient_internet

# run_with_locale

# set_memlimit

# bigmemtest

# precisionbigmemtest

# bigaddrspacetest

# requires_resource

# run_doctest

# threading_cleanup

# reap_threads

# can_symlink

# skip_unless_symlink

# SuppressCrashReport

if __name__ == '__main__':

unittest.main()

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