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
|
# 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, settings, strategies as st
from hypothesis.internal.compat import ExceptionGroup
from tests.common.utils import flaky
def go_wrong_naive(a, b):
try:
assert a + b < 100
a / b
except Exception:
# Hiding the actual problem is terrible, but this pattern can make sense
# if you're raising a library-specific or semantically meaningful error.
raise ValueError("Something went wrong") # noqa
def go_wrong_with_cause(a, b):
try:
assert a + b < 100
a / b
except Exception as err:
# Explicit chaining is the *right way* to change exception type.
raise ValueError("Something went wrong") from err
def go_wrong_coverup(a, b):
try:
assert a + b < 100
a / b
except Exception:
# This pattern SHOULD be local enough that it never distinguishes
# errors in practice... but if it does, we're ready.
raise ValueError("Something went wrong") from None
@pytest.mark.parametrize(
"function",
[go_wrong_naive, go_wrong_with_cause, go_wrong_coverup],
ids=lambda f: f.__name__,
)
@flaky(max_runs=3, min_passes=1)
def test_can_generate_specified_version(function):
@given(st.integers(), st.integers())
@settings(database=None, report_multiple_bugs=True)
def test_fn(x, y):
# Indirection to fix https://github.com/HypothesisWorks/hypothesis/issues/2888
return function(x, y)
with pytest.raises(ExceptionGroup):
test_fn()
|
