1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
|
# 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 pytest
from hypothesis import given, strategies as st
from hypothesis.errors import InvalidArgument
from tests.common.debug import assert_no_examples, minimal
def test_resampling():
x = minimal(
st.lists(st.integers(), min_size=1).flatmap(
lambda x: st.lists(st.sampled_from(x))
),
lambda x: len(x) >= 10 and len(set(x)) == 1,
)
assert x == [0] * 10
@given(st.lists(st.nothing()))
def test_list_of_nothing(xs):
assert xs == []
@given(st.sets(st.nothing()))
def test_set_of_nothing(xs):
assert xs == set()
def test_validates_min_size():
with pytest.raises(InvalidArgument):
st.lists(st.nothing(), min_size=1).validate()
def test_function_composition():
assert st.nothing().map(lambda x: "hi").is_empty
assert st.nothing().filter(lambda x: True).is_empty
assert st.nothing().flatmap(lambda x: st.integers()).is_empty
def test_tuples_detect_empty_elements():
assert st.tuples(st.nothing()).is_empty
def test_fixed_dictionaries_detect_empty_values():
assert st.fixed_dictionaries({"a": st.nothing()}).is_empty
def test_no_examples():
assert_no_examples(st.nothing())
@pytest.mark.parametrize(
"s",
[
st.nothing(),
st.nothing().map(lambda x: x),
st.nothing().filter(lambda x: True),
st.nothing().flatmap(lambda x: st.integers()),
],
)
def test_empty(s):
assert s.is_empty
|
