def test_validity(compounds_pair: Tuple[Compound, Compound]) -> None:
left_compound, right_compound = compounds_pair
result = left_compound - right_compound
with not_raises(ValueError):
result.validate()
def test_functions(f):
if accepts_args(f):
with not_raises(TypeError, match=r'.* positional argument.*'):
f(1)
else:
with pytest.raises(
TypeError,
match=r'.*takes 0 positional arguments but 1 was given.*'):
f(1)
def test_methods(method):
inst = SomeClass()
bound = getattr(inst, method.__name__)
if accepts_args(method):
with not_raises(TypeError, match=r'.* positional argument.*'):
bound(1)
else:
with pytest.raises(
TypeError,
match=r'.*takes 1 positional argument but 2 were given.*'):
bound(1)