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import atexit
import faulthandler
import os
import signal
import sys
import unittest
from test import support
try:
import gc
except ImportError:
gc = None
from test.libregrtest.refleak import warm_caches
def setup_tests(ns):
# Display the Python traceback on fatal errors (e.g. segfault)
faulthandler.enable(all_threads=True)
# Display the Python traceback on SIGALRM or SIGUSR1 signal
signals = []
if hasattr(signal, 'SIGALRM'):
signals.append(signal.SIGALRM)
if hasattr(signal, 'SIGUSR1'):
signals.append(signal.SIGUSR1)
for signum in signals:
faulthandler.register(signum, chain=True)
replace_stdout()
support.record_original_stdout(sys.stdout)
if ns.testdir:
# Prepend test directory to sys.path, so runtest() will be able
# to locate tests
sys.path.insert(0, os.path.abspath(ns.testdir))
# Some times __path__ and __file__ are not absolute (e.g. while running from
# Lib/) and, if we change the CWD to run the tests in a temporary dir, some
# imports might fail. This affects only the modules imported before os.chdir().
# These modules are searched first in sys.path[0] (so '' -- the CWD) and if
# they are found in the CWD their __file__ and __path__ will be relative (this
# happens before the chdir). All the modules imported after the chdir, are
# not found in the CWD, and since the other paths in sys.path[1:] are absolute
# (site.py absolutize them), the __file__ and __path__ will be absolute too.
# Therefore it is necessary to absolutize manually the __file__ and __path__ of
# the packages to prevent later imports to fail when the CWD is different.
for module in sys.modules.values():
if hasattr(module, '__path__'):
for index, path in enumerate(module.__path__):
module.__path__[index] = os.path.abspath(path)
if hasattr(module, '__file__'):
module.__file__ = os.path.abspath(module.__file__)
# MacOSX (a.k.a. Darwin) has a default stack size that is too small
# for deeply recursive regular expressions. We see this as crashes in
# the Python test suite when running test_re.py and test_sre.py. The
# fix is to set the stack limit to 2048.
# This approach may also be useful for other Unixy platforms that
# suffer from small default stack limits.
if sys.platform == 'darwin':
try:
import resource
except ImportError:
pass
else:
soft, hard = resource.getrlimit(resource.RLIMIT_STACK)
newsoft = min(hard, max(soft, 1024*2048))
resource.setrlimit(resource.RLIMIT_STACK, (newsoft, hard))
if ns.huntrleaks:
unittest.BaseTestSuite._cleanup = False
# Avoid false positives due to various caches
# filling slowly with random data:
warm_caches()
if ns.memlimit is not None:
support.set_memlimit(ns.memlimit)
if ns.threshold is not None:
gc.set_threshold(ns.threshold)
try:
import msvcrt
except ImportError:
pass
else:
msvcrt.SetErrorMode(msvcrt.SEM_FAILCRITICALERRORS|
msvcrt.SEM_NOALIGNMENTFAULTEXCEPT|
msvcrt.SEM_NOGPFAULTERRORBOX|
msvcrt.SEM_NOOPENFILEERRORBOX)
try:
msvcrt.CrtSetReportMode
except AttributeError:
# release build
pass
else:
for m in [msvcrt.CRT_WARN, msvcrt.CRT_ERROR, msvcrt.CRT_ASSERT]:
if ns.verbose and ns.verbose >= 2:
msvcrt.CrtSetReportMode(m, msvcrt.CRTDBG_MODE_FILE)
msvcrt.CrtSetReportFile(m, msvcrt.CRTDBG_FILE_STDERR)
else:
msvcrt.CrtSetReportMode(m, 0)
support.use_resources = ns.use_resources
def replace_stdout():
"""Set stdout encoder error handler to backslashreplace (as stderr error
handler) to avoid UnicodeEncodeError when printing a traceback"""
stdout = sys.stdout
sys.stdout = open(stdout.fileno(), 'w',
encoding=stdout.encoding,
errors="backslashreplace",
closefd=False,
newline='\n')
def restore_stdout():
sys.stdout.close()
sys.stdout = stdout
atexit.register(restore_stdout)