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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) 2013-2015 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 itertools import islice
import pytest
from hypothesis import find, given
from hypothesis.errors import InvalidArgument
from hypothesis.strategies import text, lists, booleans, streaming
from hypothesis.searchstrategy.streams import Stream
@given(lists(booleans()))
def test_stream_give_lists(xs):
s = Stream(iter(xs))
assert list(s) == xs
assert list(s) == xs
@given(lists(booleans()))
def test_can_zip_streams_with_self(xs):
s = Stream(iter(xs))
assert list(zip(s, s)) == list(zip(xs, xs))
def loop(x):
while True:
yield x
def test_can_stream_infinite():
s = Stream(loop(False))
assert list(islice(s, 100)) == [False] * 100
@given(streaming(text()))
def test_fetched_repr_is_in_stream_repr(s):
assert repr(s) == u'Stream(...)'
assert repr(next(iter(s))) in repr(s)
def test_cannot_thunk_past_end_of_list():
with pytest.raises(IndexError):
Stream([1])._thunk_to(5)
def test_thunking_evaluates_initial_list():
x = Stream([1, 2, 3])
x._thunk_to(1)
assert len(x.fetched) == 1
def test_thunking_map_evaluates_source():
x = Stream(loop(False))
y = x.map(lambda t: True)
y[100]
assert y._thunked() == 101
assert x._thunked() == 101
def test_wrong_index_raises_type_error():
with pytest.raises(InvalidArgument):
Stream([])[u'kittens']
def test_can_index_into_unindexed():
x = Stream(loop(1))
assert x[100] == 1
def test_can_map():
x = Stream([1, 2, 3]).map(lambda i: i * 2)
assert isinstance(x, Stream)
assert list(x) == [2, 4, 6]
def test_streaming_errors_in_find():
with pytest.raises(InvalidArgument):
find(streaming(booleans()), lambda x: True)
def test_default_stream_is_empty():
assert list(Stream()) == []
def test_can_slice_streams():
assert list(Stream([1, 2, 3])[:2]) == [1, 2]
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