File: test_randomization.py

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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 random

from pytest import raises

import hypothesis.strategies as st
from hypothesis import find, given, settings, Verbosity


def test_seeds_off_random():
    s = settings(max_shrinks=0, database=None)
    r = random.getstate()
    x = find(st.integers(), lambda x: True, settings=s)
    random.setstate(r)
    y = find(st.integers(), lambda x: True, settings=s)
    assert x == y


def test_nesting_with_control_passes_health_check():
    @given(st.integers(0, 100), st.random_module())
    @settings(max_examples=5, database=None)
    def test_blah(x, rnd):
        @given(st.integers())
        @settings(
            max_examples=100, max_shrinks=0, database=None,
            verbosity=Verbosity.quiet)
        def test_nest(y):
            assert y < x
        with raises(AssertionError):
            test_nest()
    test_blah()