def test_can_falsify_false_things_with_many_args(descs):
assume(len(descs) > 0)
assume(size(descs) <= MAX_SIZE)
descs = tuple(descs)
x = verifier.falsify(lambda *args: False, *descs)
strategy = small_table.strategy(descs)
assert not list(strategy.simplify(x))
def test_cannot_generate_mutable_data_from_an_immutable_strategy(d):
strategy = small_table.strategy(d)
assume(strategy.has_immutable_data)
really_small_verifier = Verifier(
settings=hs.Settings(max_examples=50, timeout=5))
with pytest.raises((Unfalsifiable, Unsatisfiable)):
print(nice_string(d),
really_small_verifier.falsify(is_immutable_data, d))
def test_can_not_save_as_incompatible_examples(dav, dav2):
strategy = small_table.strategy(dav.descriptor)
assume(not strategy.could_have_produced(dav2.value))
ft = ConverterTable.default()
try:
converter = ft.specification_for(dav.descriptor)
except NotSerializeable:
assume(False)
with pytest.raises(WrongFormat):
converter.to_basic(dav2.value)
def test_can_falsify_false_things(desc, random):
assume(size(desc) <= MAX_SIZE)
verifier.random = random
x = verifier.falsify(lambda x: False, desc)[0]
strategy = small_table.strategy(desc)
assert not list(strategy.simplify(x))
def test_can_minimize_descriptor_with_value(dav):
s = small_table.strategy(DescriptorWithValue)
list(s.simplify_such_that(dav, lambda x: True))
def test_decomposing_produces_things_that_can_be_produced(dav):
for d, v in small_table.strategy(dav.descriptor).decompose(dav.value):
assert small_table.strategy(d).could_have_produced(v)
def test_can_produce_what_it_produces(desc):
strategy = small_table.strategy(desc)
with pytest.raises(Unfalsifiable):
verifier.falsify(strategy.could_have_produced, desc)
def test_copies_all_its_values_correctly(desc, random):
strategy = small_table.strategy(desc)
value = strategy.produce(random, strategy.parameter.draw(random))
assert actually_equal(value, strategy.copy(value))