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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 unittest
import pytest
from _pytest.outcomes import Failed, Skipped
from hypothesis import Phase, example, find, given, reject, settings, strategies as s
from hypothesis.database import InMemoryExampleDatabase
from hypothesis.errors import InvalidArgument, NoSuchExample, Unsatisfiable
def test_stops_after_max_examples_if_satisfying():
tracker = []
def track(x):
tracker.append(x)
return False
max_examples = 100
with pytest.raises(NoSuchExample):
find(s.integers(0, 10000), track, settings=settings(max_examples=max_examples))
assert len(tracker) == max_examples
def test_stops_after_ten_times_max_examples_if_not_satisfying():
count = [0]
def track(x):
count[0] += 1
reject()
max_examples = 100
with pytest.raises(Unsatisfiable):
find(s.integers(0, 10000), track, settings=settings(max_examples=max_examples))
# Very occasionally we can generate overflows in generation, which also
# count towards our example budget, which means that we don't hit the
# maximum.
assert count[0] <= 10 * max_examples
some_normal_settings = settings()
def test_is_not_normally_default():
assert settings.default is not some_normal_settings
@given(s.booleans())
@some_normal_settings
def test_settings_are_default_in_given(x):
assert settings.default is some_normal_settings
def test_given_shrinks_pytest_helper_errors():
final_value = [None]
@settings(derandomize=True, max_examples=100)
@given(s.integers())
def inner(x):
final_value[0] = x
if x > 100:
pytest.fail(f"x={x!r} is too big!")
with pytest.raises(Failed):
inner()
assert final_value[0] == 101
def test_pytest_skip_skips_shrinking():
values = []
@settings(derandomize=True, max_examples=100)
@given(s.integers())
def inner(x):
values.append(x)
if x > 100:
pytest.skip(f"x={x!r} is too big!")
with pytest.raises(Skipped):
inner()
assert len([x for x in values if x > 100]) == 1
def test_can_find_with_db_eq_none():
find(s.integers(), bool, settings=settings(database=None, max_examples=100))
def test_no_such_example():
with pytest.raises(NoSuchExample):
find(s.none(), bool, database_key=b"no such example")
def test_validates_strategies_for_test_method():
invalid_strategy = s.lists(s.nothing(), min_size=1)
class TestStrategyValidation:
@given(invalid_strategy)
def test_method_with_bad_strategy(self, x):
pass
instance = TestStrategyValidation()
with pytest.raises(InvalidArgument):
instance.test_method_with_bad_strategy()
@example(1)
@given(s.integers())
@settings(phases=[Phase.target, Phase.shrink, Phase.explain])
def no_phases(_):
raise Exception
@given(s.integers())
@settings(phases=[Phase.explicit])
def no_explicit(_):
raise Exception
@given(s.integers())
@settings(phases=[Phase.reuse], database=InMemoryExampleDatabase())
def empty_db(_):
raise Exception
@pytest.mark.parametrize(
"test_fn",
[no_phases, no_explicit, empty_db],
ids=lambda t: t.__name__,
)
def test_non_executed_tests_raise_skipped(test_fn):
with pytest.raises(unittest.SkipTest):
test_fn()
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