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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 os.path
from hypothesis import assume, core, find, given, settings, strategies as st
from hypothesis.database import ExampleDatabase, InMemoryExampleDatabase
from hypothesis.errors import NoSuchExample, Unsatisfiable
from hypothesis.internal.entropy import deterministic_PRNG
from tests.common.utils import all_values, non_covering_examples
def has_a_non_zero_byte(x):
return any(bytes(x))
def test_saves_incremental_steps_in_database():
key = b"a database key"
database = InMemoryExampleDatabase()
find(
st.binary(min_size=10),
has_a_non_zero_byte,
settings=settings(database=database),
database_key=key,
)
assert len(all_values(database)) > 1
def test_clears_out_database_as_things_get_boring():
key = b"a database key"
database = InMemoryExampleDatabase()
do_we_care = True
def stuff():
try:
find(
st.binary(min_size=50),
lambda x: do_we_care and has_a_non_zero_byte(x),
settings=settings(database=database, max_examples=10),
database_key=key,
)
except NoSuchExample:
pass
stuff()
assert len(non_covering_examples(database)) > 1
do_we_care = False
stuff()
initial = len(non_covering_examples(database))
assert initial > 0
for _ in range(initial):
stuff()
keys = len(non_covering_examples(database))
if not keys:
break
else:
raise AssertionError
def test_trashes_invalid_examples():
key = b"a database key"
database = InMemoryExampleDatabase()
invalid = set()
def stuff():
try:
def condition(x):
assume(x not in invalid)
return not invalid and has_a_non_zero_byte(x)
return find(
st.binary(min_size=5),
condition,
settings=settings(database=database),
database_key=key,
)
except (Unsatisfiable, NoSuchExample):
pass
with deterministic_PRNG():
value = stuff()
original = len(all_values(database))
assert original > 1
invalid.add(value)
with deterministic_PRNG():
stuff()
assert len(all_values(database)) < original
def test_respects_max_examples_in_database_usage():
key = b"a database key"
database = InMemoryExampleDatabase()
do_we_care = True
counter = [0]
def check(x):
counter[0] += 1
return do_we_care and has_a_non_zero_byte(x)
def stuff():
try:
find(
st.binary(min_size=100),
check,
settings=settings(database=database, max_examples=10),
database_key=key,
)
except NoSuchExample:
pass
with deterministic_PRNG():
stuff()
assert len(all_values(database)) > 10
do_we_care = False
counter[0] = 0
stuff()
assert counter == [10]
def test_does_not_use_database_when_seed_is_forced(monkeypatch):
monkeypatch.setattr(core, "global_force_seed", 42)
database = InMemoryExampleDatabase()
database.fetch = None
@settings(database=database)
@given(st.integers())
def test(i):
pass
test()
@given(st.binary(), st.binary())
def test_database_not_created_when_not_used(tmp_path_factory, key, value):
path = tmp_path_factory.mktemp("hypothesis") / "examples"
assert not os.path.exists(str(path))
database = ExampleDatabase(path)
assert not list(database.fetch(key))
assert not os.path.exists(str(path))
database.save(key, value)
assert os.path.exists(str(path))
assert list(database.fetch(key)) == [value]
|
