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# This file is part of Hypothesis, which may be found at
# https://github.com/HypothesisWorks/hypothesis/
#
# Copyright the Hypothesis Authors.
# Individual contributors are listed in AUTHORS.rst and the git log.
#
# 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 https://mozilla.org/MPL/2.0/.
import math
import pytest
from hypothesis import find, settings as Settings
from hypothesis.errors import NoSuchExample
from hypothesis.strategies import booleans, dictionaries, floats, integers, lists
from tests.common.debug import minimal
def test_can_find_an_int():
assert minimal(integers()) == 0
assert minimal(integers(), lambda x: x >= 13) == 13
def test_can_find_list():
x = minimal(lists(integers()), lambda x: sum(x) >= 10)
assert sum(x) == 10
def test_can_find_nan():
minimal(floats(), math.isnan)
def test_can_find_nans():
x = minimal(lists(floats()), lambda x: math.isnan(sum(x)))
if len(x) == 1:
assert math.isnan(x[0])
else:
assert 2 <= len(x) <= 3
def test_condition_is_name():
settings = Settings(max_examples=20)
with pytest.raises(NoSuchExample) as e:
find(booleans(), lambda x: False, settings=settings)
assert "lambda x:" in e.value.args[0]
with pytest.raises(NoSuchExample) as e:
find(integers(), lambda x: "☃" in str(x), settings=settings)
assert "lambda x:" in e.value.args[0]
def bad(x):
return False
with pytest.raises(NoSuchExample) as e:
find(integers(), bad, settings=settings)
assert "bad" in e.value.args[0]
def test_find_dictionary():
smallest = minimal(
dictionaries(keys=integers(), values=integers()),
lambda xs: any(kv[0] > kv[1] for kv in xs.items()),
)
assert len(smallest) == 1
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