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"""
Helper for testing.
"""
import sys
import warnings
import os.path
import re
import subprocess
import threading
from joblib._compat import PY3_OR_LATER
def warnings_to_stdout():
""" Redirect all warnings to stdout.
"""
showwarning_orig = warnings.showwarning
def showwarning(msg, cat, fname, lno, file=None, line=0):
showwarning_orig(msg, cat, os.path.basename(fname), line, sys.stdout)
warnings.showwarning = showwarning
#warnings.simplefilter('always')
try:
from nose.tools import assert_raises_regex
except ImportError:
# For Python 2.7
try:
from nose.tools import assert_raises_regexp as assert_raises_regex
except ImportError:
# for Python 2.6
def assert_raises_regex(expected_exception, expected_regexp,
callable_obj=None, *args, **kwargs):
"""Helper function to check for message patterns in exceptions"""
not_raised = False
try:
callable_obj(*args, **kwargs)
not_raised = True
except Exception as e:
error_message = str(e)
if not re.compile(expected_regexp).search(error_message):
raise AssertionError("Error message should match pattern "
"%r. %r does not." %
(expected_regexp, error_message))
if not_raised:
raise AssertionError("Should have raised %r" %
expected_exception(expected_regexp))
def check_subprocess_call(cmd, timeout=1, stdout_regex=None,
stderr_regex=None):
"""Runs a command in a subprocess with timeout in seconds.
Also checks returncode is zero, stdout if stdout_regex is set, and
stderr if stderr_regex is set.
"""
proc = subprocess.Popen(cmd, stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
def kill_process():
proc.kill()
timer = threading.Timer(timeout, kill_process)
try:
timer.start()
stdout, stderr = proc.communicate()
if PY3_OR_LATER:
stdout, stderr = stdout.decode(), stderr.decode()
if proc.returncode != 0:
message = (
'Non-zero return code: {0}.\nStdout:\n{1}\n'
'Stderr:\n{2}').format(
proc.returncode, stdout, stderr)
raise ValueError(message)
if (stdout_regex is not None and
not re.search(stdout_regex, stdout)):
raise ValueError(
"Unexpected stdout: {0!r} does not match:\n{1!r}".format(
stdout_regex, stdout))
if (stderr_regex is not None and
not re.search(stderr_regex, stderr)):
raise ValueError(
"Unexpected stderr: {0!r} does not match:\n{1!r}".format(
stderr_regex, stderr))
finally:
timer.cancel()