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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 pytest
from hypothesis import given, settings, strategies as st
from hypothesis.database import InMemoryExampleDatabase
from hypothesis.internal.compat import ExceptionGroup
def test_does_not_shrink_on_replay():
database = InMemoryExampleDatabase()
call_count = 0
is_first = True
last = None
@settings(
database=database,
report_multiple_bugs=False,
derandomize=False,
max_examples=1000,
)
@given(st.lists(st.integers(), unique=True, min_size=3))
def test(ls):
nonlocal call_count, is_first, last
if is_first and last is not None:
assert ls == last
is_first = False
last = ls
call_count += 1
raise AssertionError
with pytest.raises(AssertionError):
test()
assert last is not None
call_count = 0
is_first = True
with pytest.raises(AssertionError):
test()
assert call_count == 2
def test_does_not_shrink_on_replay_with_multiple_bugs():
database = InMemoryExampleDatabase()
call_count = 0
raised = False
marker = 1000093
@settings(
database=database,
report_multiple_bugs=True,
derandomize=False,
max_examples=1000,
)
@given(st.integers())
def test(n):
nonlocal call_count, raised
call_count += 1
if n >= marker:
raised = True
raise AssertionError
elif n < marker and raised:
raise AssertionError
with pytest.raises(ExceptionGroup):
test()
call_count = 0
with pytest.raises(ExceptionGroup):
test()
assert call_count == 4
def test_will_always_shrink_if_previous_example_does_not_replay():
database = InMemoryExampleDatabase()
good = set()
last = None
@settings(
database=database,
report_multiple_bugs=True,
derandomize=False,
max_examples=1000,
)
@given(st.integers(min_value=0))
def test(n):
nonlocal last
if n not in good:
last = n
raise AssertionError
for i in range(20):
with pytest.raises(AssertionError):
test()
assert last == i
good.add(last)
def test_will_shrink_if_the_previous_example_does_not_look_right():
database = InMemoryExampleDatabase()
last = None
first_test = True
@settings(database=database, report_multiple_bugs=True, derandomize=False)
@given(st.data())
def test(data):
nonlocal last
m = data.draw(st.integers())
last = m
if first_test:
data.draw(st.integers())
assert m < 10000
else:
raise AssertionError
with pytest.raises(AssertionError):
test()
assert last is not None
assert last > 0
first_test = False
with pytest.raises(AssertionError):
test()
assert last == 0
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