2049 lines
69 KiB
Python
2049 lines
69 KiB
Python
# -*- coding: utf-8 -*-
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"""Supporting definitions for the Python regression tests.
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Backported for python-future from Python 3.3 test/support.py.
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"""
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from __future__ import (absolute_import, division,
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print_function, unicode_literals)
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from future import utils
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from future.builtins import str, range, open, int, map, list
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import contextlib
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import errno
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import functools
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import gc
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import socket
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import sys
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import os
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import platform
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import shutil
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import warnings
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import unittest
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# For Python 2.6 compatibility:
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if not hasattr(unittest, 'skip'):
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import unittest2 as unittest
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import importlib
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# import collections.abc # not present on Py2.7
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import re
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import subprocess
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import imp
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import time
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try:
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import sysconfig
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except ImportError:
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# sysconfig is not available on Python 2.6. Try using distutils.sysconfig instead:
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from distutils import sysconfig
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import fnmatch
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import logging.handlers
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import struct
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import tempfile
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try:
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if utils.PY3:
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import _thread, threading
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else:
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import thread as _thread, threading
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except ImportError:
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_thread = None
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threading = None
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try:
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import multiprocessing.process
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except ImportError:
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multiprocessing = None
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try:
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import zlib
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except ImportError:
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zlib = None
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try:
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import gzip
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except ImportError:
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gzip = None
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try:
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import bz2
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except ImportError:
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bz2 = None
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try:
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import lzma
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except ImportError:
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lzma = None
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__all__ = [
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"Error", "TestFailed", "ResourceDenied", "import_module", "verbose",
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"use_resources", "max_memuse", "record_original_stdout",
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"get_original_stdout", "unload", "unlink", "rmtree", "forget",
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"is_resource_enabled", "requires", "requires_freebsd_version",
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"requires_linux_version", "requires_mac_ver", "find_unused_port",
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"bind_port", "IPV6_ENABLED", "is_jython", "TESTFN", "HOST", "SAVEDCWD",
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"temp_cwd", "findfile", "create_empty_file", "sortdict",
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"check_syntax_error", "open_urlresource", "check_warnings", "CleanImport",
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"EnvironmentVarGuard", "TransientResource", "captured_stdout",
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"captured_stdin", "captured_stderr", "time_out", "socket_peer_reset",
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"ioerror_peer_reset", "run_with_locale", 'temp_umask',
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"transient_internet", "set_memlimit", "bigmemtest", "bigaddrspacetest",
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"BasicTestRunner", "run_unittest", "run_doctest", "threading_setup",
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"threading_cleanup", "reap_children", "cpython_only", "check_impl_detail",
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"get_attribute", "swap_item", "swap_attr", "requires_IEEE_754",
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"TestHandler", "Matcher", "can_symlink", "skip_unless_symlink",
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"skip_unless_xattr", "import_fresh_module", "requires_zlib",
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"PIPE_MAX_SIZE", "failfast", "anticipate_failure", "run_with_tz",
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"requires_gzip", "requires_bz2", "requires_lzma", "suppress_crash_popup",
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]
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class Error(Exception):
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"""Base class for regression test exceptions."""
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class TestFailed(Error):
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"""Test failed."""
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class ResourceDenied(unittest.SkipTest):
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"""Test skipped because it requested a disallowed resource.
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This is raised when a test calls requires() for a resource that
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has not be enabled. It is used to distinguish between expected
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and unexpected skips.
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"""
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@contextlib.contextmanager
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def _ignore_deprecated_imports(ignore=True):
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"""Context manager to suppress package and module deprecation
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warnings when importing them.
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If ignore is False, this context manager has no effect."""
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if ignore:
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with warnings.catch_warnings():
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warnings.filterwarnings("ignore", ".+ (module|package)",
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DeprecationWarning)
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yield
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else:
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yield
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def import_module(name, deprecated=False):
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"""Import and return the module to be tested, raising SkipTest if
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it is not available.
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If deprecated is True, any module or package deprecation messages
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will be suppressed."""
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with _ignore_deprecated_imports(deprecated):
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try:
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return importlib.import_module(name)
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except ImportError as msg:
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raise unittest.SkipTest(str(msg))
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def _save_and_remove_module(name, orig_modules):
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"""Helper function to save and remove a module from sys.modules
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Raise ImportError if the module can't be imported.
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"""
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# try to import the module and raise an error if it can't be imported
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if name not in sys.modules:
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__import__(name)
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del sys.modules[name]
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for modname in list(sys.modules):
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if modname == name or modname.startswith(name + '.'):
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orig_modules[modname] = sys.modules[modname]
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del sys.modules[modname]
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def _save_and_block_module(name, orig_modules):
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"""Helper function to save and block a module in sys.modules
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Return True if the module was in sys.modules, False otherwise.
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"""
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saved = True
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try:
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orig_modules[name] = sys.modules[name]
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except KeyError:
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saved = False
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sys.modules[name] = None
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return saved
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def anticipate_failure(condition):
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"""Decorator to mark a test that is known to be broken in some cases
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Any use of this decorator should have a comment identifying the
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associated tracker issue.
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"""
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if condition:
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return unittest.expectedFailure
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return lambda f: f
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def import_fresh_module(name, fresh=(), blocked=(), deprecated=False):
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"""Import and return a module, deliberately bypassing sys.modules.
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This function imports and returns a fresh copy of the named Python module
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by removing the named module from sys.modules before doing the import.
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Note that unlike reload, the original module is not affected by
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this operation.
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*fresh* is an iterable of additional module names that are also removed
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from the sys.modules cache before doing the import.
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*blocked* is an iterable of module names that are replaced with None
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in the module cache during the import to ensure that attempts to import
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them raise ImportError.
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The named module and any modules named in the *fresh* and *blocked*
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parameters are saved before starting the import and then reinserted into
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sys.modules when the fresh import is complete.
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Module and package deprecation messages are suppressed during this import
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if *deprecated* is True.
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This function will raise ImportError if the named module cannot be
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imported.
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If deprecated is True, any module or package deprecation messages
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will be suppressed.
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"""
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# NOTE: test_heapq, test_json and test_warnings include extra sanity checks
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# to make sure that this utility function is working as expected
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with _ignore_deprecated_imports(deprecated):
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# Keep track of modules saved for later restoration as well
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# as those which just need a blocking entry removed
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orig_modules = {}
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names_to_remove = []
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_save_and_remove_module(name, orig_modules)
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try:
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for fresh_name in fresh:
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_save_and_remove_module(fresh_name, orig_modules)
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for blocked_name in blocked:
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if not _save_and_block_module(blocked_name, orig_modules):
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names_to_remove.append(blocked_name)
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fresh_module = importlib.import_module(name)
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except ImportError:
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fresh_module = None
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finally:
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for orig_name, module in orig_modules.items():
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sys.modules[orig_name] = module
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for name_to_remove in names_to_remove:
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del sys.modules[name_to_remove]
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return fresh_module
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def get_attribute(obj, name):
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"""Get an attribute, raising SkipTest if AttributeError is raised."""
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try:
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attribute = getattr(obj, name)
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except AttributeError:
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raise unittest.SkipTest("object %r has no attribute %r" % (obj, name))
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else:
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return attribute
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verbose = 1 # Flag set to 0 by regrtest.py
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use_resources = None # Flag set to [] by regrtest.py
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max_memuse = 0 # Disable bigmem tests (they will still be run with
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# small sizes, to make sure they work.)
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real_max_memuse = 0
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failfast = False
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match_tests = None
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# _original_stdout is meant to hold stdout at the time regrtest began.
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# This may be "the real" stdout, or IDLE's emulation of stdout, or whatever.
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# The point is to have some flavor of stdout the user can actually see.
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_original_stdout = None
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def record_original_stdout(stdout):
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global _original_stdout
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_original_stdout = stdout
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def get_original_stdout():
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return _original_stdout or sys.stdout
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def unload(name):
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try:
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del sys.modules[name]
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except KeyError:
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pass
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if sys.platform.startswith("win"):
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def _waitfor(func, pathname, waitall=False):
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# Perform the operation
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func(pathname)
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# Now setup the wait loop
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if waitall:
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dirname = pathname
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else:
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dirname, name = os.path.split(pathname)
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dirname = dirname or '.'
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# Check for `pathname` to be removed from the filesystem.
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# The exponential backoff of the timeout amounts to a total
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# of ~1 second after which the deletion is probably an error
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# anyway.
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# Testing on a i7@4.3GHz shows that usually only 1 iteration is
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# required when contention occurs.
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timeout = 0.001
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while timeout < 1.0:
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# Note we are only testing for the existence of the file(s) in
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# the contents of the directory regardless of any security or
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# access rights. If we have made it this far, we have sufficient
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# permissions to do that much using Python's equivalent of the
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# Windows API FindFirstFile.
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# Other Windows APIs can fail or give incorrect results when
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# dealing with files that are pending deletion.
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L = os.listdir(dirname)
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if not (L if waitall else name in L):
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return
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# Increase the timeout and try again
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time.sleep(timeout)
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timeout *= 2
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warnings.warn('tests may fail, delete still pending for ' + pathname,
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RuntimeWarning, stacklevel=4)
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def _unlink(filename):
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_waitfor(os.unlink, filename)
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def _rmdir(dirname):
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_waitfor(os.rmdir, dirname)
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def _rmtree(path):
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def _rmtree_inner(path):
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for name in os.listdir(path):
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fullname = os.path.join(path, name)
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if os.path.isdir(fullname):
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_waitfor(_rmtree_inner, fullname, waitall=True)
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os.rmdir(fullname)
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else:
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os.unlink(fullname)
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_waitfor(_rmtree_inner, path, waitall=True)
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_waitfor(os.rmdir, path)
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else:
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_unlink = os.unlink
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_rmdir = os.rmdir
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_rmtree = shutil.rmtree
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def unlink(filename):
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try:
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_unlink(filename)
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except OSError as error:
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# The filename need not exist.
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if error.errno not in (errno.ENOENT, errno.ENOTDIR):
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raise
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def rmdir(dirname):
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try:
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_rmdir(dirname)
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except OSError as error:
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# The directory need not exist.
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if error.errno != errno.ENOENT:
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raise
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def rmtree(path):
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try:
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_rmtree(path)
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except OSError as error:
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if error.errno != errno.ENOENT:
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raise
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|
def make_legacy_pyc(source):
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"""Move a PEP 3147 pyc/pyo file to its legacy pyc/pyo location.
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The choice of .pyc or .pyo extension is done based on the __debug__ flag
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value.
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:param source: The file system path to the source file. The source file
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does not need to exist, however the PEP 3147 pyc file must exist.
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:return: The file system path to the legacy pyc file.
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"""
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pyc_file = imp.cache_from_source(source)
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up_one = os.path.dirname(os.path.abspath(source))
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legacy_pyc = os.path.join(up_one, source + ('c' if __debug__ else 'o'))
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os.rename(pyc_file, legacy_pyc)
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return legacy_pyc
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def forget(modname):
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"""'Forget' a module was ever imported.
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This removes the module from sys.modules and deletes any PEP 3147 or
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legacy .pyc and .pyo files.
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"""
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unload(modname)
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for dirname in sys.path:
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source = os.path.join(dirname, modname + '.py')
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# It doesn't matter if they exist or not, unlink all possible
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# combinations of PEP 3147 and legacy pyc and pyo files.
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unlink(source + 'c')
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unlink(source + 'o')
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unlink(imp.cache_from_source(source, debug_override=True))
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unlink(imp.cache_from_source(source, debug_override=False))
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# On some platforms, should not run gui test even if it is allowed
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# in `use_resources'.
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if sys.platform.startswith('win'):
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import ctypes
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import ctypes.wintypes
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def _is_gui_available():
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UOI_FLAGS = 1
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WSF_VISIBLE = 0x0001
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class USEROBJECTFLAGS(ctypes.Structure):
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_fields_ = [("fInherit", ctypes.wintypes.BOOL),
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("fReserved", ctypes.wintypes.BOOL),
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("dwFlags", ctypes.wintypes.DWORD)]
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dll = ctypes.windll.user32
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h = dll.GetProcessWindowStation()
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if not h:
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raise ctypes.WinError()
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uof = USEROBJECTFLAGS()
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needed = ctypes.wintypes.DWORD()
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res = dll.GetUserObjectInformationW(h,
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UOI_FLAGS,
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ctypes.byref(uof),
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ctypes.sizeof(uof),
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ctypes.byref(needed))
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if not res:
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raise ctypes.WinError()
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return bool(uof.dwFlags & WSF_VISIBLE)
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else:
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def _is_gui_available():
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return True
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|
|
def is_resource_enabled(resource):
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"""Test whether a resource is enabled. Known resources are set by
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regrtest.py."""
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return use_resources is not None and resource in use_resources
|
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|
|
def requires(resource, msg=None):
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"""Raise ResourceDenied if the specified resource is not available.
|
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If the caller's module is __main__ then automatically return True. The
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possibility of False being returned occurs when regrtest.py is
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executing.
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"""
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if resource == 'gui' and not _is_gui_available():
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raise unittest.SkipTest("Cannot use the 'gui' resource")
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# see if the caller's module is __main__ - if so, treat as if
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# the resource was set
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if sys._getframe(1).f_globals.get("__name__") == "__main__":
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return
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if not is_resource_enabled(resource):
|
|
if msg is None:
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msg = "Use of the %r resource not enabled" % resource
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raise ResourceDenied(msg)
|
|
|
|
def _requires_unix_version(sysname, min_version):
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|
"""Decorator raising SkipTest if the OS is `sysname` and the version is less
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than `min_version`.
|
|
|
|
For example, @_requires_unix_version('FreeBSD', (7, 2)) raises SkipTest if
|
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the FreeBSD version is less than 7.2.
|
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"""
|
|
def decorator(func):
|
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@functools.wraps(func)
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def wrapper(*args, **kw):
|
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if platform.system() == sysname:
|
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version_txt = platform.release().split('-', 1)[0]
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try:
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version = tuple(map(int, version_txt.split('.')))
|
|
except ValueError:
|
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pass
|
|
else:
|
|
if version < min_version:
|
|
min_version_txt = '.'.join(map(str, min_version))
|
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raise unittest.SkipTest(
|
|
"%s version %s or higher required, not %s"
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% (sysname, min_version_txt, version_txt))
|
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return func(*args, **kw)
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wrapper.min_version = min_version
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return wrapper
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|
return decorator
|
|
|
|
def requires_freebsd_version(*min_version):
|
|
"""Decorator raising SkipTest if the OS is FreeBSD and the FreeBSD version is
|
|
less than `min_version`.
|
|
|
|
For example, @requires_freebsd_version(7, 2) raises SkipTest if the FreeBSD
|
|
version is less than 7.2.
|
|
"""
|
|
return _requires_unix_version('FreeBSD', min_version)
|
|
|
|
def requires_linux_version(*min_version):
|
|
"""Decorator raising SkipTest if the OS is Linux and the Linux version is
|
|
less than `min_version`.
|
|
|
|
For example, @requires_linux_version(2, 6, 32) raises SkipTest if the Linux
|
|
version is less than 2.6.32.
|
|
"""
|
|
return _requires_unix_version('Linux', min_version)
|
|
|
|
def requires_mac_ver(*min_version):
|
|
"""Decorator raising SkipTest if the OS is Mac OS X and the OS X
|
|
version if less than min_version.
|
|
|
|
For example, @requires_mac_ver(10, 5) raises SkipTest if the OS X version
|
|
is lesser than 10.5.
|
|
"""
|
|
def decorator(func):
|
|
@functools.wraps(func)
|
|
def wrapper(*args, **kw):
|
|
if sys.platform == 'darwin':
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|
version_txt = platform.mac_ver()[0]
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|
try:
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version = tuple(map(int, version_txt.split('.')))
|
|
except ValueError:
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pass
|
|
else:
|
|
if version < min_version:
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min_version_txt = '.'.join(map(str, min_version))
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|
raise unittest.SkipTest(
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|
"Mac OS X %s or higher required, not %s"
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|
% (min_version_txt, version_txt))
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|
return func(*args, **kw)
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|
wrapper.min_version = min_version
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return wrapper
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|
return decorator
|
|
|
|
# Don't use "localhost", since resolving it uses the DNS under recent
|
|
# Windows versions (see issue #18792).
|
|
HOST = "127.0.0.1"
|
|
HOSTv6 = "::1"
|
|
|
|
|
|
def find_unused_port(family=socket.AF_INET, socktype=socket.SOCK_STREAM):
|
|
"""Returns an unused port that should be suitable for binding. This is
|
|
achieved by creating a temporary socket with the same family and type as
|
|
the 'sock' parameter (default is AF_INET, SOCK_STREAM), and binding it to
|
|
the specified host address (defaults to 0.0.0.0) with the port set to 0,
|
|
eliciting an unused ephemeral port from the OS. The temporary socket is
|
|
then closed and deleted, and the ephemeral port is returned.
|
|
|
|
Either this method or bind_port() should be used for any tests where a
|
|
server socket needs to be bound to a particular port for the duration of
|
|
the test. Which one to use depends on whether the calling code is creating
|
|
a python socket, or if an unused port needs to be provided in a constructor
|
|
or passed to an external program (i.e. the -accept argument to openssl's
|
|
s_server mode). Always prefer bind_port() over find_unused_port() where
|
|
possible. Hard coded ports should *NEVER* be used. As soon as a server
|
|
socket is bound to a hard coded port, the ability to run multiple instances
|
|
of the test simultaneously on the same host is compromised, which makes the
|
|
test a ticking time bomb in a buildbot environment. On Unix buildbots, this
|
|
may simply manifest as a failed test, which can be recovered from without
|
|
intervention in most cases, but on Windows, the entire python process can
|
|
completely and utterly wedge, requiring someone to log in to the buildbot
|
|
and manually kill the affected process.
|
|
|
|
(This is easy to reproduce on Windows, unfortunately, and can be traced to
|
|
the SO_REUSEADDR socket option having different semantics on Windows versus
|
|
Unix/Linux. On Unix, you can't have two AF_INET SOCK_STREAM sockets bind,
|
|
listen and then accept connections on identical host/ports. An EADDRINUSE
|
|
socket.error will be raised at some point (depending on the platform and
|
|
the order bind and listen were called on each socket).
|
|
|
|
However, on Windows, if SO_REUSEADDR is set on the sockets, no EADDRINUSE
|
|
will ever be raised when attempting to bind two identical host/ports. When
|
|
accept() is called on each socket, the second caller's process will steal
|
|
the port from the first caller, leaving them both in an awkwardly wedged
|
|
state where they'll no longer respond to any signals or graceful kills, and
|
|
must be forcibly killed via OpenProcess()/TerminateProcess().
|
|
|
|
The solution on Windows is to use the SO_EXCLUSIVEADDRUSE socket option
|
|
instead of SO_REUSEADDR, which effectively affords the same semantics as
|
|
SO_REUSEADDR on Unix. Given the propensity of Unix developers in the Open
|
|
Source world compared to Windows ones, this is a common mistake. A quick
|
|
look over OpenSSL's 0.9.8g source shows that they use SO_REUSEADDR when
|
|
openssl.exe is called with the 's_server' option, for example. See
|
|
http://bugs.python.org/issue2550 for more info. The following site also
|
|
has a very thorough description about the implications of both REUSEADDR
|
|
and EXCLUSIVEADDRUSE on Windows:
|
|
http://msdn2.microsoft.com/en-us/library/ms740621(VS.85).aspx)
|
|
|
|
XXX: although this approach is a vast improvement on previous attempts to
|
|
elicit unused ports, it rests heavily on the assumption that the ephemeral
|
|
port returned to us by the OS won't immediately be dished back out to some
|
|
other process when we close and delete our temporary socket but before our
|
|
calling code has a chance to bind the returned port. We can deal with this
|
|
issue if/when we come across it.
|
|
"""
|
|
|
|
tempsock = socket.socket(family, socktype)
|
|
port = bind_port(tempsock)
|
|
tempsock.close()
|
|
del tempsock
|
|
return port
|
|
|
|
def bind_port(sock, host=HOST):
|
|
"""Bind the socket to a free port and return the port number. Relies on
|
|
ephemeral ports in order to ensure we are using an unbound port. This is
|
|
important as many tests may be running simultaneously, especially in a
|
|
buildbot environment. This method raises an exception if the sock.family
|
|
is AF_INET and sock.type is SOCK_STREAM, *and* the socket has SO_REUSEADDR
|
|
or SO_REUSEPORT set on it. Tests should *never* set these socket options
|
|
for TCP/IP sockets. The only case for setting these options is testing
|
|
multicasting via multiple UDP sockets.
|
|
|
|
Additionally, if the SO_EXCLUSIVEADDRUSE socket option is available (i.e.
|
|
on Windows), it will be set on the socket. This will prevent anyone else
|
|
from bind()'ing to our host/port for the duration of the test.
|
|
"""
|
|
|
|
if sock.family == socket.AF_INET and sock.type == socket.SOCK_STREAM:
|
|
if hasattr(socket, 'SO_REUSEADDR'):
|
|
if sock.getsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR) == 1:
|
|
raise TestFailed("tests should never set the SO_REUSEADDR " \
|
|
"socket option on TCP/IP sockets!")
|
|
if hasattr(socket, 'SO_REUSEPORT'):
|
|
try:
|
|
if sock.getsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT) == 1:
|
|
raise TestFailed("tests should never set the SO_REUSEPORT " \
|
|
"socket option on TCP/IP sockets!")
|
|
except socket.error:
|
|
# Python's socket module was compiled using modern headers
|
|
# thus defining SO_REUSEPORT but this process is running
|
|
# under an older kernel that does not support SO_REUSEPORT.
|
|
pass
|
|
if hasattr(socket, 'SO_EXCLUSIVEADDRUSE'):
|
|
sock.setsockopt(socket.SOL_SOCKET, socket.SO_EXCLUSIVEADDRUSE, 1)
|
|
|
|
sock.bind((host, 0))
|
|
port = sock.getsockname()[1]
|
|
return port
|
|
|
|
def _is_ipv6_enabled():
|
|
"""Check whether IPv6 is enabled on this host."""
|
|
if socket.has_ipv6:
|
|
sock = None
|
|
try:
|
|
sock = socket.socket(socket.AF_INET6, socket.SOCK_STREAM)
|
|
sock.bind(('::1', 0))
|
|
return True
|
|
except (socket.error, socket.gaierror):
|
|
pass
|
|
finally:
|
|
if sock:
|
|
sock.close()
|
|
return False
|
|
|
|
IPV6_ENABLED = _is_ipv6_enabled()
|
|
|
|
|
|
# A constant likely larger than the underlying OS pipe buffer size, to
|
|
# make writes blocking.
|
|
# Windows limit seems to be around 512 B, and many Unix kernels have a
|
|
# 64 KiB pipe buffer size or 16 * PAGE_SIZE: take a few megs to be sure.
|
|
# (see issue #17835 for a discussion of this number).
|
|
PIPE_MAX_SIZE = 4 * 1024 * 1024 + 1
|
|
|
|
# A constant likely larger than the underlying OS socket buffer size, to make
|
|
# writes blocking.
|
|
# The socket buffer sizes can usually be tuned system-wide (e.g. through sysctl
|
|
# on Linux), or on a per-socket basis (SO_SNDBUF/SO_RCVBUF). See issue #18643
|
|
# for a discussion of this number).
|
|
SOCK_MAX_SIZE = 16 * 1024 * 1024 + 1
|
|
|
|
# # decorator for skipping tests on non-IEEE 754 platforms
|
|
# requires_IEEE_754 = unittest.skipUnless(
|
|
# float.__getformat__("double").startswith("IEEE"),
|
|
# "test requires IEEE 754 doubles")
|
|
|
|
requires_zlib = unittest.skipUnless(zlib, 'requires zlib')
|
|
|
|
requires_bz2 = unittest.skipUnless(bz2, 'requires bz2')
|
|
|
|
requires_lzma = unittest.skipUnless(lzma, 'requires lzma')
|
|
|
|
is_jython = sys.platform.startswith('java')
|
|
|
|
# Filename used for testing
|
|
if os.name == 'java':
|
|
# Jython disallows @ in module names
|
|
TESTFN = '$test'
|
|
else:
|
|
TESTFN = '@test'
|
|
|
|
# Disambiguate TESTFN for parallel testing, while letting it remain a valid
|
|
# module name.
|
|
TESTFN = "{0}_{1}_tmp".format(TESTFN, os.getpid())
|
|
|
|
# # FS_NONASCII: non-ASCII character encodable by os.fsencode(),
|
|
# # or None if there is no such character.
|
|
# FS_NONASCII = None
|
|
# for character in (
|
|
# # First try printable and common characters to have a readable filename.
|
|
# # For each character, the encoding list are just example of encodings able
|
|
# # to encode the character (the list is not exhaustive).
|
|
#
|
|
# # U+00E6 (Latin Small Letter Ae): cp1252, iso-8859-1
|
|
# '\u00E6',
|
|
# # U+0130 (Latin Capital Letter I With Dot Above): cp1254, iso8859_3
|
|
# '\u0130',
|
|
# # U+0141 (Latin Capital Letter L With Stroke): cp1250, cp1257
|
|
# '\u0141',
|
|
# # U+03C6 (Greek Small Letter Phi): cp1253
|
|
# '\u03C6',
|
|
# # U+041A (Cyrillic Capital Letter Ka): cp1251
|
|
# '\u041A',
|
|
# # U+05D0 (Hebrew Letter Alef): Encodable to cp424
|
|
# '\u05D0',
|
|
# # U+060C (Arabic Comma): cp864, cp1006, iso8859_6, mac_arabic
|
|
# '\u060C',
|
|
# # U+062A (Arabic Letter Teh): cp720
|
|
# '\u062A',
|
|
# # U+0E01 (Thai Character Ko Kai): cp874
|
|
# '\u0E01',
|
|
#
|
|
# # Then try more "special" characters. "special" because they may be
|
|
# # interpreted or displayed differently depending on the exact locale
|
|
# # encoding and the font.
|
|
#
|
|
# # U+00A0 (No-Break Space)
|
|
# '\u00A0',
|
|
# # U+20AC (Euro Sign)
|
|
# '\u20AC',
|
|
# ):
|
|
# try:
|
|
# os.fsdecode(os.fsencode(character))
|
|
# except UnicodeError:
|
|
# pass
|
|
# else:
|
|
# FS_NONASCII = character
|
|
# break
|
|
#
|
|
# # TESTFN_UNICODE is a non-ascii filename
|
|
# TESTFN_UNICODE = TESTFN + "-\xe0\xf2\u0258\u0141\u011f"
|
|
# if sys.platform == 'darwin':
|
|
# # In Mac OS X's VFS API file names are, by definition, canonically
|
|
# # decomposed Unicode, encoded using UTF-8. See QA1173:
|
|
# # http://developer.apple.com/mac/library/qa/qa2001/qa1173.html
|
|
# import unicodedata
|
|
# TESTFN_UNICODE = unicodedata.normalize('NFD', TESTFN_UNICODE)
|
|
# TESTFN_ENCODING = sys.getfilesystemencoding()
|
|
#
|
|
# # TESTFN_UNENCODABLE is a filename (str type) that should *not* be able to be
|
|
# # encoded by the filesystem encoding (in strict mode). It can be None if we
|
|
# # cannot generate such filename.
|
|
# TESTFN_UNENCODABLE = None
|
|
# if os.name in ('nt', 'ce'):
|
|
# # skip win32s (0) or Windows 9x/ME (1)
|
|
# if sys.getwindowsversion().platform >= 2:
|
|
# # Different kinds of characters from various languages to minimize the
|
|
# # probability that the whole name is encodable to MBCS (issue #9819)
|
|
# TESTFN_UNENCODABLE = TESTFN + "-\u5171\u0141\u2661\u0363\uDC80"
|
|
# try:
|
|
# TESTFN_UNENCODABLE.encode(TESTFN_ENCODING)
|
|
# except UnicodeEncodeError:
|
|
# pass
|
|
# else:
|
|
# print('WARNING: The filename %r CAN be encoded by the filesystem encoding (%s). '
|
|
# 'Unicode filename tests may not be effective'
|
|
# % (TESTFN_UNENCODABLE, TESTFN_ENCODING))
|
|
# TESTFN_UNENCODABLE = None
|
|
# # Mac OS X denies unencodable filenames (invalid utf-8)
|
|
# elif sys.platform != 'darwin':
|
|
# try:
|
|
# # ascii and utf-8 cannot encode the byte 0xff
|
|
# b'\xff'.decode(TESTFN_ENCODING)
|
|
# except UnicodeDecodeError:
|
|
# # 0xff will be encoded using the surrogate character u+DCFF
|
|
# TESTFN_UNENCODABLE = TESTFN \
|
|
# + b'-\xff'.decode(TESTFN_ENCODING, 'surrogateescape')
|
|
# else:
|
|
# # File system encoding (eg. ISO-8859-* encodings) can encode
|
|
# # the byte 0xff. Skip some unicode filename tests.
|
|
# pass
|
|
#
|
|
# # TESTFN_UNDECODABLE is a filename (bytes type) that should *not* be able to be
|
|
# # decoded from the filesystem encoding (in strict mode). It can be None if we
|
|
# # cannot generate such filename (ex: the latin1 encoding can decode any byte
|
|
# # sequence). On UNIX, TESTFN_UNDECODABLE can be decoded by os.fsdecode() thanks
|
|
# # to the surrogateescape error handler (PEP 383), but not from the filesystem
|
|
# # encoding in strict mode.
|
|
# TESTFN_UNDECODABLE = None
|
|
# for name in (
|
|
# # b'\xff' is not decodable by os.fsdecode() with code page 932. Windows
|
|
# # accepts it to create a file or a directory, or don't accept to enter to
|
|
# # such directory (when the bytes name is used). So test b'\xe7' first: it is
|
|
# # not decodable from cp932.
|
|
# b'\xe7w\xf0',
|
|
# # undecodable from ASCII, UTF-8
|
|
# b'\xff',
|
|
# # undecodable from iso8859-3, iso8859-6, iso8859-7, cp424, iso8859-8, cp856
|
|
# # and cp857
|
|
# b'\xae\xd5'
|
|
# # undecodable from UTF-8 (UNIX and Mac OS X)
|
|
# b'\xed\xb2\x80', b'\xed\xb4\x80',
|
|
# # undecodable from shift_jis, cp869, cp874, cp932, cp1250, cp1251, cp1252,
|
|
# # cp1253, cp1254, cp1255, cp1257, cp1258
|
|
# b'\x81\x98',
|
|
# ):
|
|
# try:
|
|
# name.decode(TESTFN_ENCODING)
|
|
# except UnicodeDecodeError:
|
|
# TESTFN_UNDECODABLE = os.fsencode(TESTFN) + name
|
|
# break
|
|
#
|
|
# if FS_NONASCII:
|
|
# TESTFN_NONASCII = TESTFN + '-' + FS_NONASCII
|
|
# else:
|
|
# TESTFN_NONASCII = None
|
|
|
|
# Save the initial cwd
|
|
SAVEDCWD = os.getcwd()
|
|
|
|
@contextlib.contextmanager
|
|
def temp_cwd(name='tempcwd', quiet=False, path=None):
|
|
"""
|
|
Context manager that temporarily changes the CWD.
|
|
|
|
An existing path may be provided as *path*, in which case this
|
|
function makes no changes to the file system.
|
|
|
|
Otherwise, the new CWD is created in the current directory and it's
|
|
named *name*. If *quiet* is False (default) and it's not possible to
|
|
create or change the CWD, an error is raised. If it's True, only a
|
|
warning is raised and the original CWD is used.
|
|
"""
|
|
saved_dir = os.getcwd()
|
|
is_temporary = False
|
|
if path is None:
|
|
path = name
|
|
try:
|
|
os.mkdir(name)
|
|
is_temporary = True
|
|
except OSError:
|
|
if not quiet:
|
|
raise
|
|
warnings.warn('tests may fail, unable to create temp CWD ' + name,
|
|
RuntimeWarning, stacklevel=3)
|
|
try:
|
|
os.chdir(path)
|
|
except OSError:
|
|
if not quiet:
|
|
raise
|
|
warnings.warn('tests may fail, unable to change the CWD to ' + path,
|
|
RuntimeWarning, stacklevel=3)
|
|
try:
|
|
yield os.getcwd()
|
|
finally:
|
|
os.chdir(saved_dir)
|
|
if is_temporary:
|
|
rmtree(name)
|
|
|
|
|
|
if hasattr(os, "umask"):
|
|
@contextlib.contextmanager
|
|
def temp_umask(umask):
|
|
"""Context manager that temporarily sets the process umask."""
|
|
oldmask = os.umask(umask)
|
|
try:
|
|
yield
|
|
finally:
|
|
os.umask(oldmask)
|
|
|
|
|
|
def findfile(file, here=__file__, subdir=None):
|
|
"""Try to find a file on sys.path and the working directory. If it is not
|
|
found the argument passed to the function is returned (this does not
|
|
necessarily signal failure; could still be the legitimate path)."""
|
|
if os.path.isabs(file):
|
|
return file
|
|
if subdir is not None:
|
|
file = os.path.join(subdir, file)
|
|
path = sys.path
|
|
path = [os.path.dirname(here)] + path
|
|
for dn in path:
|
|
fn = os.path.join(dn, file)
|
|
if os.path.exists(fn): return fn
|
|
return file
|
|
|
|
def create_empty_file(filename):
|
|
"""Create an empty file. If the file already exists, truncate it."""
|
|
fd = os.open(filename, os.O_WRONLY | os.O_CREAT | os.O_TRUNC)
|
|
os.close(fd)
|
|
|
|
def sortdict(dict):
|
|
"Like repr(dict), but in sorted order."
|
|
items = sorted(dict.items())
|
|
reprpairs = ["%r: %r" % pair for pair in items]
|
|
withcommas = ", ".join(reprpairs)
|
|
return "{%s}" % withcommas
|
|
|
|
def make_bad_fd():
|
|
"""
|
|
Create an invalid file descriptor by opening and closing a file and return
|
|
its fd.
|
|
"""
|
|
file = open(TESTFN, "wb")
|
|
try:
|
|
return file.fileno()
|
|
finally:
|
|
file.close()
|
|
unlink(TESTFN)
|
|
|
|
def check_syntax_error(testcase, statement):
|
|
testcase.assertRaises(SyntaxError, compile, statement,
|
|
'<test string>', 'exec')
|
|
|
|
def open_urlresource(url, *args, **kw):
|
|
from future.backports.urllib import (request as urllib_request,
|
|
parse as urllib_parse)
|
|
|
|
check = kw.pop('check', None)
|
|
|
|
filename = urllib_parse.urlparse(url)[2].split('/')[-1] # '/': it's URL!
|
|
|
|
fn = os.path.join(os.path.dirname(__file__), "data", filename)
|
|
|
|
def check_valid_file(fn):
|
|
f = open(fn, *args, **kw)
|
|
if check is None:
|
|
return f
|
|
elif check(f):
|
|
f.seek(0)
|
|
return f
|
|
f.close()
|
|
|
|
if os.path.exists(fn):
|
|
f = check_valid_file(fn)
|
|
if f is not None:
|
|
return f
|
|
unlink(fn)
|
|
|
|
# Verify the requirement before downloading the file
|
|
requires('urlfetch')
|
|
|
|
print('\tfetching %s ...' % url, file=get_original_stdout())
|
|
f = urllib_request.urlopen(url, timeout=15)
|
|
try:
|
|
with open(fn, "wb") as out:
|
|
s = f.read()
|
|
while s:
|
|
out.write(s)
|
|
s = f.read()
|
|
finally:
|
|
f.close()
|
|
|
|
f = check_valid_file(fn)
|
|
if f is not None:
|
|
return f
|
|
raise TestFailed('invalid resource %r' % fn)
|
|
|
|
|
|
class WarningsRecorder(object):
|
|
"""Convenience wrapper for the warnings list returned on
|
|
entry to the warnings.catch_warnings() context manager.
|
|
"""
|
|
def __init__(self, warnings_list):
|
|
self._warnings = warnings_list
|
|
self._last = 0
|
|
|
|
def __getattr__(self, attr):
|
|
if len(self._warnings) > self._last:
|
|
return getattr(self._warnings[-1], attr)
|
|
elif attr in warnings.WarningMessage._WARNING_DETAILS:
|
|
return None
|
|
raise AttributeError("%r has no attribute %r" % (self, attr))
|
|
|
|
@property
|
|
def warnings(self):
|
|
return self._warnings[self._last:]
|
|
|
|
def reset(self):
|
|
self._last = len(self._warnings)
|
|
|
|
|
|
def _filterwarnings(filters, quiet=False):
|
|
"""Catch the warnings, then check if all the expected
|
|
warnings have been raised and re-raise unexpected warnings.
|
|
If 'quiet' is True, only re-raise the unexpected warnings.
|
|
"""
|
|
# Clear the warning registry of the calling module
|
|
# in order to re-raise the warnings.
|
|
frame = sys._getframe(2)
|
|
registry = frame.f_globals.get('__warningregistry__')
|
|
if registry:
|
|
if utils.PY3:
|
|
registry.clear()
|
|
else:
|
|
# Py2-compatible:
|
|
for i in range(len(registry)):
|
|
registry.pop()
|
|
with warnings.catch_warnings(record=True) as w:
|
|
# Set filter "always" to record all warnings. Because
|
|
# test_warnings swap the module, we need to look up in
|
|
# the sys.modules dictionary.
|
|
sys.modules['warnings'].simplefilter("always")
|
|
yield WarningsRecorder(w)
|
|
# Filter the recorded warnings
|
|
reraise = list(w)
|
|
missing = []
|
|
for msg, cat in filters:
|
|
seen = False
|
|
for w in reraise[:]:
|
|
warning = w.message
|
|
# Filter out the matching messages
|
|
if (re.match(msg, str(warning), re.I) and
|
|
issubclass(warning.__class__, cat)):
|
|
seen = True
|
|
reraise.remove(w)
|
|
if not seen and not quiet:
|
|
# This filter caught nothing
|
|
missing.append((msg, cat.__name__))
|
|
if reraise:
|
|
raise AssertionError("unhandled warning %s" % reraise[0])
|
|
if missing:
|
|
raise AssertionError("filter (%r, %s) did not catch any warning" %
|
|
missing[0])
|
|
|
|
|
|
@contextlib.contextmanager
|
|
def check_warnings(*filters, **kwargs):
|
|
"""Context manager to silence warnings.
|
|
|
|
Accept 2-tuples as positional arguments:
|
|
("message regexp", WarningCategory)
|
|
|
|
Optional argument:
|
|
- if 'quiet' is True, it does not fail if a filter catches nothing
|
|
(default True without argument,
|
|
default False if some filters are defined)
|
|
|
|
Without argument, it defaults to:
|
|
check_warnings(("", Warning), quiet=True)
|
|
"""
|
|
quiet = kwargs.get('quiet')
|
|
if not filters:
|
|
filters = (("", Warning),)
|
|
# Preserve backward compatibility
|
|
if quiet is None:
|
|
quiet = True
|
|
return _filterwarnings(filters, quiet)
|
|
|
|
|
|
class CleanImport(object):
|
|
"""Context manager to force import to return a new module reference.
|
|
|
|
This is useful for testing module-level behaviours, such as
|
|
the emission of a DeprecationWarning on import.
|
|
|
|
Use like this:
|
|
|
|
with CleanImport("foo"):
|
|
importlib.import_module("foo") # new reference
|
|
"""
|
|
|
|
def __init__(self, *module_names):
|
|
self.original_modules = sys.modules.copy()
|
|
for module_name in module_names:
|
|
if module_name in sys.modules:
|
|
module = sys.modules[module_name]
|
|
# It is possible that module_name is just an alias for
|
|
# another module (e.g. stub for modules renamed in 3.x).
|
|
# In that case, we also need delete the real module to clear
|
|
# the import cache.
|
|
if module.__name__ != module_name:
|
|
del sys.modules[module.__name__]
|
|
del sys.modules[module_name]
|
|
|
|
def __enter__(self):
|
|
return self
|
|
|
|
def __exit__(self, *ignore_exc):
|
|
sys.modules.update(self.original_modules)
|
|
|
|
### Added for python-future:
|
|
if utils.PY3:
|
|
import collections.abc
|
|
mybase = collections.abc.MutableMapping
|
|
else:
|
|
import UserDict
|
|
mybase = UserDict.DictMixin
|
|
###
|
|
|
|
class EnvironmentVarGuard(mybase):
|
|
|
|
"""Class to help protect the environment variable properly. Can be used as
|
|
a context manager."""
|
|
|
|
def __init__(self):
|
|
self._environ = os.environ
|
|
self._changed = {}
|
|
|
|
def __getitem__(self, envvar):
|
|
return self._environ[envvar]
|
|
|
|
def __setitem__(self, envvar, value):
|
|
# Remember the initial value on the first access
|
|
if envvar not in self._changed:
|
|
self._changed[envvar] = self._environ.get(envvar)
|
|
self._environ[envvar] = value
|
|
|
|
def __delitem__(self, envvar):
|
|
# Remember the initial value on the first access
|
|
if envvar not in self._changed:
|
|
self._changed[envvar] = self._environ.get(envvar)
|
|
if envvar in self._environ:
|
|
del self._environ[envvar]
|
|
|
|
def keys(self):
|
|
return self._environ.keys()
|
|
|
|
def __iter__(self):
|
|
return iter(self._environ)
|
|
|
|
def __len__(self):
|
|
return len(self._environ)
|
|
|
|
def set(self, envvar, value):
|
|
self[envvar] = value
|
|
|
|
def unset(self, envvar):
|
|
del self[envvar]
|
|
|
|
def __enter__(self):
|
|
return self
|
|
|
|
def __exit__(self, *ignore_exc):
|
|
for (k, v) in self._changed.items():
|
|
if v is None:
|
|
if k in self._environ:
|
|
del self._environ[k]
|
|
else:
|
|
self._environ[k] = v
|
|
os.environ = self._environ
|
|
|
|
|
|
class DirsOnSysPath(object):
|
|
"""Context manager to temporarily add directories to sys.path.
|
|
|
|
This makes a copy of sys.path, appends any directories given
|
|
as positional arguments, then reverts sys.path to the copied
|
|
settings when the context ends.
|
|
|
|
Note that *all* sys.path modifications in the body of the
|
|
context manager, including replacement of the object,
|
|
will be reverted at the end of the block.
|
|
"""
|
|
|
|
def __init__(self, *paths):
|
|
self.original_value = sys.path[:]
|
|
self.original_object = sys.path
|
|
sys.path.extend(paths)
|
|
|
|
def __enter__(self):
|
|
return self
|
|
|
|
def __exit__(self, *ignore_exc):
|
|
sys.path = self.original_object
|
|
sys.path[:] = self.original_value
|
|
|
|
|
|
class TransientResource(object):
|
|
|
|
"""Raise ResourceDenied if an exception is raised while the context manager
|
|
is in effect that matches the specified exception and attributes."""
|
|
|
|
def __init__(self, exc, **kwargs):
|
|
self.exc = exc
|
|
self.attrs = kwargs
|
|
|
|
def __enter__(self):
|
|
return self
|
|
|
|
def __exit__(self, type_=None, value=None, traceback=None):
|
|
"""If type_ is a subclass of self.exc and value has attributes matching
|
|
self.attrs, raise ResourceDenied. Otherwise let the exception
|
|
propagate (if any)."""
|
|
if type_ is not None and issubclass(self.exc, type_):
|
|
for attr, attr_value in self.attrs.items():
|
|
if not hasattr(value, attr):
|
|
break
|
|
if getattr(value, attr) != attr_value:
|
|
break
|
|
else:
|
|
raise ResourceDenied("an optional resource is not available")
|
|
|
|
# Context managers that raise ResourceDenied when various issues
|
|
# with the Internet connection manifest themselves as exceptions.
|
|
# XXX deprecate these and use transient_internet() instead
|
|
time_out = TransientResource(IOError, errno=errno.ETIMEDOUT)
|
|
socket_peer_reset = TransientResource(socket.error, errno=errno.ECONNRESET)
|
|
ioerror_peer_reset = TransientResource(IOError, errno=errno.ECONNRESET)
|
|
|
|
|
|
@contextlib.contextmanager
|
|
def transient_internet(resource_name, timeout=30.0, errnos=()):
|
|
"""Return a context manager that raises ResourceDenied when various issues
|
|
with the Internet connection manifest themselves as exceptions."""
|
|
default_errnos = [
|
|
('ECONNREFUSED', 111),
|
|
('ECONNRESET', 104),
|
|
('EHOSTUNREACH', 113),
|
|
('ENETUNREACH', 101),
|
|
('ETIMEDOUT', 110),
|
|
]
|
|
default_gai_errnos = [
|
|
('EAI_AGAIN', -3),
|
|
('EAI_FAIL', -4),
|
|
('EAI_NONAME', -2),
|
|
('EAI_NODATA', -5),
|
|
# Encountered when trying to resolve IPv6-only hostnames
|
|
('WSANO_DATA', 11004),
|
|
]
|
|
|
|
denied = ResourceDenied("Resource %r is not available" % resource_name)
|
|
captured_errnos = errnos
|
|
gai_errnos = []
|
|
if not captured_errnos:
|
|
captured_errnos = [getattr(errno, name, num)
|
|
for (name, num) in default_errnos]
|
|
gai_errnos = [getattr(socket, name, num)
|
|
for (name, num) in default_gai_errnos]
|
|
|
|
def filter_error(err):
|
|
n = getattr(err, 'errno', None)
|
|
if (isinstance(err, socket.timeout) or
|
|
(isinstance(err, socket.gaierror) and n in gai_errnos) or
|
|
n in captured_errnos):
|
|
if not verbose:
|
|
sys.stderr.write(denied.args[0] + "\n")
|
|
# Was: raise denied from err
|
|
# For Python-Future:
|
|
exc = denied
|
|
exc.__cause__ = err
|
|
raise exc
|
|
|
|
old_timeout = socket.getdefaulttimeout()
|
|
try:
|
|
if timeout is not None:
|
|
socket.setdefaulttimeout(timeout)
|
|
yield
|
|
except IOError as err:
|
|
# urllib can wrap original socket errors multiple times (!), we must
|
|
# unwrap to get at the original error.
|
|
while True:
|
|
a = err.args
|
|
if len(a) >= 1 and isinstance(a[0], IOError):
|
|
err = a[0]
|
|
# The error can also be wrapped as args[1]:
|
|
# except socket.error as msg:
|
|
# raise IOError('socket error', msg).with_traceback(sys.exc_info()[2])
|
|
elif len(a) >= 2 and isinstance(a[1], IOError):
|
|
err = a[1]
|
|
else:
|
|
break
|
|
filter_error(err)
|
|
raise
|
|
# XXX should we catch generic exceptions and look for their
|
|
# __cause__ or __context__?
|
|
finally:
|
|
socket.setdefaulttimeout(old_timeout)
|
|
|
|
|
|
@contextlib.contextmanager
|
|
def captured_output(stream_name):
|
|
"""Return a context manager used by captured_stdout/stdin/stderr
|
|
that temporarily replaces the sys stream *stream_name* with a StringIO."""
|
|
import io
|
|
orig_stdout = getattr(sys, stream_name)
|
|
setattr(sys, stream_name, io.StringIO())
|
|
try:
|
|
yield getattr(sys, stream_name)
|
|
finally:
|
|
setattr(sys, stream_name, orig_stdout)
|
|
|
|
def captured_stdout():
|
|
"""Capture the output of sys.stdout:
|
|
|
|
with captured_stdout() as s:
|
|
print("hello")
|
|
self.assertEqual(s.getvalue(), "hello")
|
|
"""
|
|
return captured_output("stdout")
|
|
|
|
def captured_stderr():
|
|
return captured_output("stderr")
|
|
|
|
def captured_stdin():
|
|
return captured_output("stdin")
|
|
|
|
|
|
def gc_collect():
|
|
"""Force as many objects as possible to be collected.
|
|
|
|
In non-CPython implementations of Python, this is needed because timely
|
|
deallocation is not guaranteed by the garbage collector. (Even in CPython
|
|
this can be the case in case of reference cycles.) This means that __del__
|
|
methods may be called later than expected and weakrefs may remain alive for
|
|
longer than expected. This function tries its best to force all garbage
|
|
objects to disappear.
|
|
"""
|
|
gc.collect()
|
|
if is_jython:
|
|
time.sleep(0.1)
|
|
gc.collect()
|
|
gc.collect()
|
|
|
|
@contextlib.contextmanager
|
|
def disable_gc():
|
|
have_gc = gc.isenabled()
|
|
gc.disable()
|
|
try:
|
|
yield
|
|
finally:
|
|
if have_gc:
|
|
gc.enable()
|
|
|
|
|
|
def python_is_optimized():
|
|
"""Find if Python was built with optimizations."""
|
|
# We don't have sysconfig on Py2.6:
|
|
import sysconfig
|
|
cflags = sysconfig.get_config_var('PY_CFLAGS') or ''
|
|
final_opt = ""
|
|
for opt in cflags.split():
|
|
if opt.startswith('-O'):
|
|
final_opt = opt
|
|
return final_opt != '' and final_opt != '-O0'
|
|
|
|
|
|
_header = 'nP'
|
|
_align = '0n'
|
|
if hasattr(sys, "gettotalrefcount"):
|
|
_header = '2P' + _header
|
|
_align = '0P'
|
|
_vheader = _header + 'n'
|
|
|
|
def calcobjsize(fmt):
|
|
return struct.calcsize(_header + fmt + _align)
|
|
|
|
def calcvobjsize(fmt):
|
|
return struct.calcsize(_vheader + fmt + _align)
|
|
|
|
|
|
_TPFLAGS_HAVE_GC = 1<<14
|
|
_TPFLAGS_HEAPTYPE = 1<<9
|
|
|
|
def check_sizeof(test, o, size):
|
|
result = sys.getsizeof(o)
|
|
# add GC header size
|
|
if ((type(o) == type) and (o.__flags__ & _TPFLAGS_HEAPTYPE) or\
|
|
((type(o) != type) and (type(o).__flags__ & _TPFLAGS_HAVE_GC))):
|
|
size += _testcapi.SIZEOF_PYGC_HEAD
|
|
msg = 'wrong size for %s: got %d, expected %d' \
|
|
% (type(o), result, size)
|
|
test.assertEqual(result, size, msg)
|
|
|
|
#=======================================================================
|
|
# Decorator for running a function in a different locale, correctly resetting
|
|
# it afterwards.
|
|
|
|
def run_with_locale(catstr, *locales):
|
|
def decorator(func):
|
|
def inner(*args, **kwds):
|
|
try:
|
|
import locale
|
|
category = getattr(locale, catstr)
|
|
orig_locale = locale.setlocale(category)
|
|
except AttributeError:
|
|
# if the test author gives us an invalid category string
|
|
raise
|
|
except:
|
|
# cannot retrieve original locale, so do nothing
|
|
locale = orig_locale = None
|
|
else:
|
|
for loc in locales:
|
|
try:
|
|
locale.setlocale(category, loc)
|
|
break
|
|
except:
|
|
pass
|
|
|
|
# now run the function, resetting the locale on exceptions
|
|
try:
|
|
return func(*args, **kwds)
|
|
finally:
|
|
if locale and orig_locale:
|
|
locale.setlocale(category, orig_locale)
|
|
inner.__name__ = func.__name__
|
|
inner.__doc__ = func.__doc__
|
|
return inner
|
|
return decorator
|
|
|
|
#=======================================================================
|
|
# Decorator for running a function in a specific timezone, correctly
|
|
# resetting it afterwards.
|
|
|
|
def run_with_tz(tz):
|
|
def decorator(func):
|
|
def inner(*args, **kwds):
|
|
try:
|
|
tzset = time.tzset
|
|
except AttributeError:
|
|
raise unittest.SkipTest("tzset required")
|
|
if 'TZ' in os.environ:
|
|
orig_tz = os.environ['TZ']
|
|
else:
|
|
orig_tz = None
|
|
os.environ['TZ'] = tz
|
|
tzset()
|
|
|
|
# now run the function, resetting the tz on exceptions
|
|
try:
|
|
return func(*args, **kwds)
|
|
finally:
|
|
if orig_tz is None:
|
|
del os.environ['TZ']
|
|
else:
|
|
os.environ['TZ'] = orig_tz
|
|
time.tzset()
|
|
|
|
inner.__name__ = func.__name__
|
|
inner.__doc__ = func.__doc__
|
|
return inner
|
|
return decorator
|
|
|
|
#=======================================================================
|
|
# Big-memory-test support. Separate from 'resources' because memory use
|
|
# should be configurable.
|
|
|
|
# Some handy shorthands. Note that these are used for byte-limits as well
|
|
# as size-limits, in the various bigmem tests
|
|
_1M = 1024*1024
|
|
_1G = 1024 * _1M
|
|
_2G = 2 * _1G
|
|
_4G = 4 * _1G
|
|
|
|
MAX_Py_ssize_t = sys.maxsize
|
|
|
|
def set_memlimit(limit):
|
|
global max_memuse
|
|
global real_max_memuse
|
|
sizes = {
|
|
'k': 1024,
|
|
'm': _1M,
|
|
'g': _1G,
|
|
't': 1024*_1G,
|
|
}
|
|
m = re.match(r'(\d+(\.\d+)?) (K|M|G|T)b?$', limit,
|
|
re.IGNORECASE | re.VERBOSE)
|
|
if m is None:
|
|
raise ValueError('Invalid memory limit %r' % (limit,))
|
|
memlimit = int(float(m.group(1)) * sizes[m.group(3).lower()])
|
|
real_max_memuse = memlimit
|
|
if memlimit > MAX_Py_ssize_t:
|
|
memlimit = MAX_Py_ssize_t
|
|
if memlimit < _2G - 1:
|
|
raise ValueError('Memory limit %r too low to be useful' % (limit,))
|
|
max_memuse = memlimit
|
|
|
|
class _MemoryWatchdog(object):
|
|
"""An object which periodically watches the process' memory consumption
|
|
and prints it out.
|
|
"""
|
|
|
|
def __init__(self):
|
|
self.procfile = '/proc/{pid}/statm'.format(pid=os.getpid())
|
|
self.started = False
|
|
|
|
def start(self):
|
|
try:
|
|
f = open(self.procfile, 'r')
|
|
except OSError as e:
|
|
warnings.warn('/proc not available for stats: {0}'.format(e),
|
|
RuntimeWarning)
|
|
sys.stderr.flush()
|
|
return
|
|
|
|
watchdog_script = findfile("memory_watchdog.py")
|
|
self.mem_watchdog = subprocess.Popen([sys.executable, watchdog_script],
|
|
stdin=f, stderr=subprocess.DEVNULL)
|
|
f.close()
|
|
self.started = True
|
|
|
|
def stop(self):
|
|
if self.started:
|
|
self.mem_watchdog.terminate()
|
|
self.mem_watchdog.wait()
|
|
|
|
|
|
def bigmemtest(size, memuse, dry_run=True):
|
|
"""Decorator for bigmem tests.
|
|
|
|
'minsize' is the minimum useful size for the test (in arbitrary,
|
|
test-interpreted units.) 'memuse' is the number of 'bytes per size' for
|
|
the test, or a good estimate of it.
|
|
|
|
if 'dry_run' is False, it means the test doesn't support dummy runs
|
|
when -M is not specified.
|
|
"""
|
|
def decorator(f):
|
|
def wrapper(self):
|
|
size = wrapper.size
|
|
memuse = wrapper.memuse
|
|
if not real_max_memuse:
|
|
maxsize = 5147
|
|
else:
|
|
maxsize = size
|
|
|
|
if ((real_max_memuse or not dry_run)
|
|
and real_max_memuse < maxsize * memuse):
|
|
raise unittest.SkipTest(
|
|
"not enough memory: %.1fG minimum needed"
|
|
% (size * memuse / (1024 ** 3)))
|
|
|
|
if real_max_memuse and verbose:
|
|
print()
|
|
print(" ... expected peak memory use: {peak:.1f}G"
|
|
.format(peak=size * memuse / (1024 ** 3)))
|
|
watchdog = _MemoryWatchdog()
|
|
watchdog.start()
|
|
else:
|
|
watchdog = None
|
|
|
|
try:
|
|
return f(self, maxsize)
|
|
finally:
|
|
if watchdog:
|
|
watchdog.stop()
|
|
|
|
wrapper.size = size
|
|
wrapper.memuse = memuse
|
|
return wrapper
|
|
return decorator
|
|
|
|
def bigaddrspacetest(f):
|
|
"""Decorator for tests that fill the address space."""
|
|
def wrapper(self):
|
|
if max_memuse < MAX_Py_ssize_t:
|
|
if MAX_Py_ssize_t >= 2**63 - 1 and max_memuse >= 2**31:
|
|
raise unittest.SkipTest(
|
|
"not enough memory: try a 32-bit build instead")
|
|
else:
|
|
raise unittest.SkipTest(
|
|
"not enough memory: %.1fG minimum needed"
|
|
% (MAX_Py_ssize_t / (1024 ** 3)))
|
|
else:
|
|
return f(self)
|
|
return wrapper
|
|
|
|
#=======================================================================
|
|
# unittest integration.
|
|
|
|
class BasicTestRunner(object):
|
|
def run(self, test):
|
|
result = unittest.TestResult()
|
|
test(result)
|
|
return result
|
|
|
|
def _id(obj):
|
|
return obj
|
|
|
|
def requires_resource(resource):
|
|
if resource == 'gui' and not _is_gui_available():
|
|
return unittest.skip("resource 'gui' is not available")
|
|
if is_resource_enabled(resource):
|
|
return _id
|
|
else:
|
|
return unittest.skip("resource {0!r} is not enabled".format(resource))
|
|
|
|
def cpython_only(test):
|
|
"""
|
|
Decorator for tests only applicable on CPython.
|
|
"""
|
|
return impl_detail(cpython=True)(test)
|
|
|
|
def impl_detail(msg=None, **guards):
|
|
if check_impl_detail(**guards):
|
|
return _id
|
|
if msg is None:
|
|
guardnames, default = _parse_guards(guards)
|
|
if default:
|
|
msg = "implementation detail not available on {0}"
|
|
else:
|
|
msg = "implementation detail specific to {0}"
|
|
guardnames = sorted(guardnames.keys())
|
|
msg = msg.format(' or '.join(guardnames))
|
|
return unittest.skip(msg)
|
|
|
|
def _parse_guards(guards):
|
|
# Returns a tuple ({platform_name: run_me}, default_value)
|
|
if not guards:
|
|
return ({'cpython': True}, False)
|
|
is_true = list(guards.values())[0]
|
|
assert list(guards.values()) == [is_true] * len(guards) # all True or all False
|
|
return (guards, not is_true)
|
|
|
|
# Use the following check to guard CPython's implementation-specific tests --
|
|
# or to run them only on the implementation(s) guarded by the arguments.
|
|
def check_impl_detail(**guards):
|
|
"""This function returns True or False depending on the host platform.
|
|
Examples:
|
|
if check_impl_detail(): # only on CPython (default)
|
|
if check_impl_detail(jython=True): # only on Jython
|
|
if check_impl_detail(cpython=False): # everywhere except on CPython
|
|
"""
|
|
guards, default = _parse_guards(guards)
|
|
return guards.get(platform.python_implementation().lower(), default)
|
|
|
|
|
|
def no_tracing(func):
|
|
"""Decorator to temporarily turn off tracing for the duration of a test."""
|
|
if not hasattr(sys, 'gettrace'):
|
|
return func
|
|
else:
|
|
@functools.wraps(func)
|
|
def wrapper(*args, **kwargs):
|
|
original_trace = sys.gettrace()
|
|
try:
|
|
sys.settrace(None)
|
|
return func(*args, **kwargs)
|
|
finally:
|
|
sys.settrace(original_trace)
|
|
return wrapper
|
|
|
|
|
|
def refcount_test(test):
|
|
"""Decorator for tests which involve reference counting.
|
|
|
|
To start, the decorator does not run the test if is not run by CPython.
|
|
After that, any trace function is unset during the test to prevent
|
|
unexpected refcounts caused by the trace function.
|
|
|
|
"""
|
|
return no_tracing(cpython_only(test))
|
|
|
|
|
|
def _filter_suite(suite, pred):
|
|
"""Recursively filter test cases in a suite based on a predicate."""
|
|
newtests = []
|
|
for test in suite._tests:
|
|
if isinstance(test, unittest.TestSuite):
|
|
_filter_suite(test, pred)
|
|
newtests.append(test)
|
|
else:
|
|
if pred(test):
|
|
newtests.append(test)
|
|
suite._tests = newtests
|
|
|
|
def _run_suite(suite):
|
|
"""Run tests from a unittest.TestSuite-derived class."""
|
|
if verbose:
|
|
runner = unittest.TextTestRunner(sys.stdout, verbosity=2,
|
|
failfast=failfast)
|
|
else:
|
|
runner = BasicTestRunner()
|
|
|
|
result = runner.run(suite)
|
|
if not result.wasSuccessful():
|
|
if len(result.errors) == 1 and not result.failures:
|
|
err = result.errors[0][1]
|
|
elif len(result.failures) == 1 and not result.errors:
|
|
err = result.failures[0][1]
|
|
else:
|
|
err = "multiple errors occurred"
|
|
if not verbose: err += "; run in verbose mode for details"
|
|
raise TestFailed(err)
|
|
|
|
|
|
def run_unittest(*classes):
|
|
"""Run tests from unittest.TestCase-derived classes."""
|
|
valid_types = (unittest.TestSuite, unittest.TestCase)
|
|
suite = unittest.TestSuite()
|
|
for cls in classes:
|
|
if isinstance(cls, str):
|
|
if cls in sys.modules:
|
|
suite.addTest(unittest.findTestCases(sys.modules[cls]))
|
|
else:
|
|
raise ValueError("str arguments must be keys in sys.modules")
|
|
elif isinstance(cls, valid_types):
|
|
suite.addTest(cls)
|
|
else:
|
|
suite.addTest(unittest.makeSuite(cls))
|
|
def case_pred(test):
|
|
if match_tests is None:
|
|
return True
|
|
for name in test.id().split("."):
|
|
if fnmatch.fnmatchcase(name, match_tests):
|
|
return True
|
|
return False
|
|
_filter_suite(suite, case_pred)
|
|
_run_suite(suite)
|
|
|
|
# We don't have sysconfig on Py2.6:
|
|
# #=======================================================================
|
|
# # Check for the presence of docstrings.
|
|
#
|
|
# HAVE_DOCSTRINGS = (check_impl_detail(cpython=False) or
|
|
# sys.platform == 'win32' or
|
|
# sysconfig.get_config_var('WITH_DOC_STRINGS'))
|
|
#
|
|
# requires_docstrings = unittest.skipUnless(HAVE_DOCSTRINGS,
|
|
# "test requires docstrings")
|
|
#
|
|
#
|
|
# #=======================================================================
|
|
# doctest driver.
|
|
|
|
def run_doctest(module, verbosity=None, optionflags=0):
|
|
"""Run doctest on the given module. Return (#failures, #tests).
|
|
|
|
If optional argument verbosity is not specified (or is None), pass
|
|
support's belief about verbosity on to doctest. Else doctest's
|
|
usual behavior is used (it searches sys.argv for -v).
|
|
"""
|
|
|
|
import doctest
|
|
|
|
if verbosity is None:
|
|
verbosity = verbose
|
|
else:
|
|
verbosity = None
|
|
|
|
f, t = doctest.testmod(module, verbose=verbosity, optionflags=optionflags)
|
|
if f:
|
|
raise TestFailed("%d of %d doctests failed" % (f, t))
|
|
if verbose:
|
|
print('doctest (%s) ... %d tests with zero failures' %
|
|
(module.__name__, t))
|
|
return f, t
|
|
|
|
|
|
#=======================================================================
|
|
# Support for saving and restoring the imported modules.
|
|
|
|
def modules_setup():
|
|
return sys.modules.copy(),
|
|
|
|
def modules_cleanup(oldmodules):
|
|
# Encoders/decoders are registered permanently within the internal
|
|
# codec cache. If we destroy the corresponding modules their
|
|
# globals will be set to None which will trip up the cached functions.
|
|
encodings = [(k, v) for k, v in sys.modules.items()
|
|
if k.startswith('encodings.')]
|
|
# Was:
|
|
# sys.modules.clear()
|
|
# Py2-compatible:
|
|
for i in range(len(sys.modules)):
|
|
sys.modules.pop()
|
|
|
|
sys.modules.update(encodings)
|
|
# XXX: This kind of problem can affect more than just encodings. In particular
|
|
# extension modules (such as _ssl) don't cope with reloading properly.
|
|
# Really, test modules should be cleaning out the test specific modules they
|
|
# know they added (ala test_runpy) rather than relying on this function (as
|
|
# test_importhooks and test_pkg do currently).
|
|
# Implicitly imported *real* modules should be left alone (see issue 10556).
|
|
sys.modules.update(oldmodules)
|
|
|
|
#=======================================================================
|
|
# Backported versions of threading_setup() and threading_cleanup() which don't refer
|
|
# to threading._dangling (not available on Py2.7).
|
|
|
|
# Threading support to prevent reporting refleaks when running regrtest.py -R
|
|
|
|
# NOTE: we use thread._count() rather than threading.enumerate() (or the
|
|
# moral equivalent thereof) because a threading.Thread object is still alive
|
|
# until its __bootstrap() method has returned, even after it has been
|
|
# unregistered from the threading module.
|
|
# thread._count(), on the other hand, only gets decremented *after* the
|
|
# __bootstrap() method has returned, which gives us reliable reference counts
|
|
# at the end of a test run.
|
|
|
|
def threading_setup():
|
|
if _thread:
|
|
return _thread._count(),
|
|
else:
|
|
return 1,
|
|
|
|
def threading_cleanup(nb_threads):
|
|
if not _thread:
|
|
return
|
|
|
|
_MAX_COUNT = 10
|
|
for count in range(_MAX_COUNT):
|
|
n = _thread._count()
|
|
if n == nb_threads:
|
|
break
|
|
time.sleep(0.1)
|
|
# XXX print a warning in case of failure?
|
|
|
|
def reap_threads(func):
|
|
"""Use this function when threads are being used. This will
|
|
ensure that the threads are cleaned up even when the test fails.
|
|
If threading is unavailable this function does nothing.
|
|
"""
|
|
if not _thread:
|
|
return func
|
|
|
|
@functools.wraps(func)
|
|
def decorator(*args):
|
|
key = threading_setup()
|
|
try:
|
|
return func(*args)
|
|
finally:
|
|
threading_cleanup(*key)
|
|
return decorator
|
|
|
|
def reap_children():
|
|
"""Use this function at the end of test_main() whenever sub-processes
|
|
are started. This will help ensure that no extra children (zombies)
|
|
stick around to hog resources and create problems when looking
|
|
for refleaks.
|
|
"""
|
|
|
|
# Reap all our dead child processes so we don't leave zombies around.
|
|
# These hog resources and might be causing some of the buildbots to die.
|
|
if hasattr(os, 'waitpid'):
|
|
any_process = -1
|
|
while True:
|
|
try:
|
|
# This will raise an exception on Windows. That's ok.
|
|
pid, status = os.waitpid(any_process, os.WNOHANG)
|
|
if pid == 0:
|
|
break
|
|
except:
|
|
break
|
|
|
|
@contextlib.contextmanager
|
|
def swap_attr(obj, attr, new_val):
|
|
"""Temporary swap out an attribute with a new object.
|
|
|
|
Usage:
|
|
with swap_attr(obj, "attr", 5):
|
|
...
|
|
|
|
This will set obj.attr to 5 for the duration of the with: block,
|
|
restoring the old value at the end of the block. If `attr` doesn't
|
|
exist on `obj`, it will be created and then deleted at the end of the
|
|
block.
|
|
"""
|
|
if hasattr(obj, attr):
|
|
real_val = getattr(obj, attr)
|
|
setattr(obj, attr, new_val)
|
|
try:
|
|
yield
|
|
finally:
|
|
setattr(obj, attr, real_val)
|
|
else:
|
|
setattr(obj, attr, new_val)
|
|
try:
|
|
yield
|
|
finally:
|
|
delattr(obj, attr)
|
|
|
|
@contextlib.contextmanager
|
|
def swap_item(obj, item, new_val):
|
|
"""Temporary swap out an item with a new object.
|
|
|
|
Usage:
|
|
with swap_item(obj, "item", 5):
|
|
...
|
|
|
|
This will set obj["item"] to 5 for the duration of the with: block,
|
|
restoring the old value at the end of the block. If `item` doesn't
|
|
exist on `obj`, it will be created and then deleted at the end of the
|
|
block.
|
|
"""
|
|
if item in obj:
|
|
real_val = obj[item]
|
|
obj[item] = new_val
|
|
try:
|
|
yield
|
|
finally:
|
|
obj[item] = real_val
|
|
else:
|
|
obj[item] = new_val
|
|
try:
|
|
yield
|
|
finally:
|
|
del obj[item]
|
|
|
|
def strip_python_stderr(stderr):
|
|
"""Strip the stderr of a Python process from potential debug output
|
|
emitted by the interpreter.
|
|
|
|
This will typically be run on the result of the communicate() method
|
|
of a subprocess.Popen object.
|
|
"""
|
|
stderr = re.sub(br"\[\d+ refs\]\r?\n?", b"", stderr).strip()
|
|
return stderr
|
|
|
|
def args_from_interpreter_flags():
|
|
"""Return a list of command-line arguments reproducing the current
|
|
settings in sys.flags and sys.warnoptions."""
|
|
return subprocess._args_from_interpreter_flags()
|
|
|
|
#============================================================
|
|
# Support for assertions about logging.
|
|
#============================================================
|
|
|
|
class TestHandler(logging.handlers.BufferingHandler):
|
|
def __init__(self, matcher):
|
|
# BufferingHandler takes a "capacity" argument
|
|
# so as to know when to flush. As we're overriding
|
|
# shouldFlush anyway, we can set a capacity of zero.
|
|
# You can call flush() manually to clear out the
|
|
# buffer.
|
|
logging.handlers.BufferingHandler.__init__(self, 0)
|
|
self.matcher = matcher
|
|
|
|
def shouldFlush(self):
|
|
return False
|
|
|
|
def emit(self, record):
|
|
self.format(record)
|
|
self.buffer.append(record.__dict__)
|
|
|
|
def matches(self, **kwargs):
|
|
"""
|
|
Look for a saved dict whose keys/values match the supplied arguments.
|
|
"""
|
|
result = False
|
|
for d in self.buffer:
|
|
if self.matcher.matches(d, **kwargs):
|
|
result = True
|
|
break
|
|
return result
|
|
|
|
class Matcher(object):
|
|
|
|
_partial_matches = ('msg', 'message')
|
|
|
|
def matches(self, d, **kwargs):
|
|
"""
|
|
Try to match a single dict with the supplied arguments.
|
|
|
|
Keys whose values are strings and which are in self._partial_matches
|
|
will be checked for partial (i.e. substring) matches. You can extend
|
|
this scheme to (for example) do regular expression matching, etc.
|
|
"""
|
|
result = True
|
|
for k in kwargs:
|
|
v = kwargs[k]
|
|
dv = d.get(k)
|
|
if not self.match_value(k, dv, v):
|
|
result = False
|
|
break
|
|
return result
|
|
|
|
def match_value(self, k, dv, v):
|
|
"""
|
|
Try to match a single stored value (dv) with a supplied value (v).
|
|
"""
|
|
if type(v) != type(dv):
|
|
result = False
|
|
elif type(dv) is not str or k not in self._partial_matches:
|
|
result = (v == dv)
|
|
else:
|
|
result = dv.find(v) >= 0
|
|
return result
|
|
|
|
|
|
_can_symlink = None
|
|
def can_symlink():
|
|
global _can_symlink
|
|
if _can_symlink is not None:
|
|
return _can_symlink
|
|
symlink_path = TESTFN + "can_symlink"
|
|
try:
|
|
os.symlink(TESTFN, symlink_path)
|
|
can = True
|
|
except (OSError, NotImplementedError, AttributeError):
|
|
can = False
|
|
else:
|
|
os.remove(symlink_path)
|
|
_can_symlink = can
|
|
return can
|
|
|
|
def skip_unless_symlink(test):
|
|
"""Skip decorator for tests that require functional symlink"""
|
|
ok = can_symlink()
|
|
msg = "Requires functional symlink implementation"
|
|
return test if ok else unittest.skip(msg)(test)
|
|
|
|
_can_xattr = None
|
|
def can_xattr():
|
|
global _can_xattr
|
|
if _can_xattr is not None:
|
|
return _can_xattr
|
|
if not hasattr(os, "setxattr"):
|
|
can = False
|
|
else:
|
|
tmp_fp, tmp_name = tempfile.mkstemp()
|
|
try:
|
|
with open(TESTFN, "wb") as fp:
|
|
try:
|
|
# TESTFN & tempfile may use different file systems with
|
|
# different capabilities
|
|
os.setxattr(tmp_fp, b"user.test", b"")
|
|
os.setxattr(fp.fileno(), b"user.test", b"")
|
|
# Kernels < 2.6.39 don't respect setxattr flags.
|
|
kernel_version = platform.release()
|
|
m = re.match("2.6.(\d{1,2})", kernel_version)
|
|
can = m is None or int(m.group(1)) >= 39
|
|
except OSError:
|
|
can = False
|
|
finally:
|
|
unlink(TESTFN)
|
|
unlink(tmp_name)
|
|
_can_xattr = can
|
|
return can
|
|
|
|
def skip_unless_xattr(test):
|
|
"""Skip decorator for tests that require functional extended attributes"""
|
|
ok = can_xattr()
|
|
msg = "no non-broken extended attribute support"
|
|
return test if ok else unittest.skip(msg)(test)
|
|
|
|
|
|
if sys.platform.startswith('win'):
|
|
@contextlib.contextmanager
|
|
def suppress_crash_popup():
|
|
"""Disable Windows Error Reporting dialogs using SetErrorMode."""
|
|
# see http://msdn.microsoft.com/en-us/library/windows/desktop/ms680621%28v=vs.85%29.aspx
|
|
# GetErrorMode is not available on Windows XP and Windows Server 2003,
|
|
# but SetErrorMode returns the previous value, so we can use that
|
|
import ctypes
|
|
k32 = ctypes.windll.kernel32
|
|
SEM_NOGPFAULTERRORBOX = 0x02
|
|
old_error_mode = k32.SetErrorMode(SEM_NOGPFAULTERRORBOX)
|
|
k32.SetErrorMode(old_error_mode | SEM_NOGPFAULTERRORBOX)
|
|
try:
|
|
yield
|
|
finally:
|
|
k32.SetErrorMode(old_error_mode)
|
|
else:
|
|
# this is a no-op for other platforms
|
|
@contextlib.contextmanager
|
|
def suppress_crash_popup():
|
|
yield
|
|
|
|
|
|
def patch(test_instance, object_to_patch, attr_name, new_value):
|
|
"""Override 'object_to_patch'.'attr_name' with 'new_value'.
|
|
|
|
Also, add a cleanup procedure to 'test_instance' to restore
|
|
'object_to_patch' value for 'attr_name'.
|
|
The 'attr_name' should be a valid attribute for 'object_to_patch'.
|
|
|
|
"""
|
|
# check that 'attr_name' is a real attribute for 'object_to_patch'
|
|
# will raise AttributeError if it does not exist
|
|
getattr(object_to_patch, attr_name)
|
|
|
|
# keep a copy of the old value
|
|
attr_is_local = False
|
|
try:
|
|
old_value = object_to_patch.__dict__[attr_name]
|
|
except (AttributeError, KeyError):
|
|
old_value = getattr(object_to_patch, attr_name, None)
|
|
else:
|
|
attr_is_local = True
|
|
|
|
# restore the value when the test is done
|
|
def cleanup():
|
|
if attr_is_local:
|
|
setattr(object_to_patch, attr_name, old_value)
|
|
else:
|
|
delattr(object_to_patch, attr_name)
|
|
|
|
test_instance.addCleanup(cleanup)
|
|
|
|
# actually override the attribute
|
|
setattr(object_to_patch, attr_name, new_value)
|