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# coding=utf-8
#
# This file is part of Hypothesis, which may be found at
# https://github.com/HypothesisWorks/hypothesis-python
#
# Most of this work is copyright (C) 2013-2016 David R. MacIver
# (david@drmaciver.com), but it contains contributions by others. See
# CONTRIBUTING.rst for a full list of people who may hold copyright, and
# consult the git log if you need to determine who owns an individual
# contribution.
#
# This Source Code Form is subject to the terms of the Mozilla Public License,
# v. 2.0. If a copy of the MPL was not distributed with this file, You can
# obtain one at http://mozilla.org/MPL/2.0/.
#
# END HEADER
from __future__ import division, print_function, absolute_import
import sys
import traceback
import contextlib
from io import BytesIO, StringIO
from hypothesis.reporting import default, with_reporter
from hypothesis.internal.compat import PY2
from hypothesis.internal.reflection import proxies
@contextlib.contextmanager
def capture_out():
old_out = sys.stdout
try:
new_out = BytesIO() if PY2 else StringIO()
sys.stdout = new_out
with with_reporter(default):
yield new_out
finally:
sys.stdout = old_out
class ExcInfo(object):
pass
@contextlib.contextmanager
def raises(exctype):
e = ExcInfo()
try:
yield e
assert False, "Expected to raise an exception but didn't"
except exctype as err:
traceback.print_exc()
e.value = err
return
def fails_with(e):
def accepts(f):
@proxies(f)
def inverted_test(*arguments, **kwargs):
with raises(e):
f(*arguments, **kwargs)
return inverted_test
return accepts
fails = fails_with(AssertionError)
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