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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 HealthCheck, Phase, settings
from hypothesis.database import InMemoryExampleDatabase
from hypothesis.internal.compat import int_to_bytes
from hypothesis.internal.conjecture.data import Status
from hypothesis.internal.conjecture.engine import ConjectureRunner, RunIsComplete
from hypothesis.internal.entropy import deterministic_PRNG
def test_pareto_front_contains_different_interesting_reasons():
with deterministic_PRNG():
def test(data):
data.mark_interesting(data.draw_bits(4))
runner = ConjectureRunner(
test,
settings=settings(
max_examples=5000,
database=InMemoryExampleDatabase(),
suppress_health_check=HealthCheck.all(),
),
database_key=b"stuff",
)
runner.run()
assert len(runner.pareto_front) == 2**4
def test_database_contains_only_pareto_front():
with deterministic_PRNG():
def test(data):
data.target_observations["1"] = data.draw_bits(4)
data.draw_bits(64)
data.target_observations["2"] = data.draw_bits(8)
db = InMemoryExampleDatabase()
runner = ConjectureRunner(
test,
settings=settings(
max_examples=500, database=db, suppress_health_check=HealthCheck.all()
),
database_key=b"stuff",
)
runner.run()
assert len(runner.pareto_front) <= 500
for v in runner.pareto_front:
assert v.status >= Status.VALID
assert len(db.data) == 1
(values,) = db.data.values()
values = set(values)
assert len(values) == len(runner.pareto_front)
for data in runner.pareto_front:
assert data.buffer in values
assert data in runner.pareto_front
for k in values:
assert runner.cached_test_function(k) in runner.pareto_front
def test_clears_defunct_pareto_front():
with deterministic_PRNG():
def test(data):
data.draw_bits(8)
data.draw_bits(8)
db = InMemoryExampleDatabase()
runner = ConjectureRunner(
test,
settings=settings(
max_examples=10000,
database=db,
suppress_health_check=HealthCheck.all(),
phases=[Phase.reuse],
),
database_key=b"stuff",
)
for i in range(256):
db.save(runner.pareto_key, bytes([i, 0]))
runner.run()
assert len(list(db.fetch(runner.pareto_key))) == 1
def test_down_samples_the_pareto_front():
with deterministic_PRNG():
def test(data):
data.draw_bits(8)
data.draw_bits(8)
db = InMemoryExampleDatabase()
runner = ConjectureRunner(
test,
settings=settings(
max_examples=1000,
database=db,
suppress_health_check=HealthCheck.all(),
phases=[Phase.reuse],
),
database_key=b"stuff",
)
for i in range(10000):
db.save(runner.pareto_key, int_to_bytes(i, 2))
with pytest.raises(RunIsComplete):
runner.reuse_existing_examples()
assert runner.valid_examples == 1000
def test_stops_loading_pareto_front_if_interesting():
with deterministic_PRNG():
def test(data):
data.draw_bits(8)
data.draw_bits(8)
data.mark_interesting()
db = InMemoryExampleDatabase()
runner = ConjectureRunner(
test,
settings=settings(
max_examples=1000,
database=db,
suppress_health_check=HealthCheck.all(),
phases=[Phase.reuse],
),
database_key=b"stuff",
)
for i in range(10000):
db.save(runner.pareto_key, int_to_bytes(i, 2))
runner.reuse_existing_examples()
assert runner.call_count == 1
def test_uses_tags_in_calculating_pareto_front():
with deterministic_PRNG():
def test(data):
if data.draw_bits(1):
data.start_example(11)
data.draw_bits(8)
data.stop_example()
runner = ConjectureRunner(
test,
settings=settings(max_examples=10, database=InMemoryExampleDatabase()),
database_key=b"stuff",
)
runner.run()
assert len(runner.pareto_front) == 2
def test_optimises_the_pareto_front():
def test(data):
count = 0
while data.draw_bits(8):
count += 1
data.target_observations[""] = min(count, 5)
runner = ConjectureRunner(
test,
settings=settings(max_examples=10000, database=InMemoryExampleDatabase()),
database_key=b"stuff",
)
runner.cached_test_function([255] * 20 + [0])
runner.pareto_optimise()
assert len(runner.pareto_front) == 6
for i, data in enumerate(runner.pareto_front):
assert list(data.buffer) == [1] * i + [0]
def test_does_not_optimise_the_pareto_front_if_interesting():
def test(data):
n = data.draw_bits(8)
data.target_observations[""] = n
if n == 255:
data.mark_interesting()
runner = ConjectureRunner(
test,
settings=settings(max_examples=10000, database=InMemoryExampleDatabase()),
database_key=b"stuff",
)
runner.cached_test_function([0])
runner.pareto_optimise = None
runner.optimise_targets()
assert runner.interesting_examples
def test_stops_optimising_once_interesting():
hi = 2**16 - 1
def test(data):
n = data.draw_bits(16)
data.target_observations[""] = n
if n < hi:
data.mark_interesting()
runner = ConjectureRunner(
test,
settings=settings(max_examples=10000, database=InMemoryExampleDatabase()),
database_key=b"stuff",
)
data = runner.cached_test_function([255] * 2)
assert data.status == Status.VALID
runner.pareto_optimise()
assert runner.call_count <= 20
assert runner.interesting_examples
|
