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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
from hypothesis import find, given
from hypothesis.strategies import permutations
def test_can_find_non_trivial_permutation():
x = find(
permutations(list(range(5))), lambda x: x[0] != 0
)
assert x == [1, 0, 2, 3, 4]
@given(permutations(list(u'abcd')))
def test_permutation_values_are_permutations(perm):
assert len(perm) == 4
assert set(perm) == set(u'abcd')
@given(permutations([]))
def test_empty_permutations_are_empty(xs):
assert xs == []
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