def test_has_attribute_predicate():
def f(x):
return x.count(2)
g = guard(Any.has('count'))(f)
with pytest.raises(NoMatch):
g({})
with pytest.raises(NoMatch):
g(1)
assert g((1, 2, 2, 3)) == 2
def test_has_with_predicate():
X = type('X', (object, ), {'value': None})
def f(x):
return x.value
g = guard(Any.has(value=Any(int)))(f)
with pytest.raises(NoMatch):
g('123')
with pytest.raises(NoMatch):
x = X()
x.value = '321'
g(x)
x = X()
x.value = 321
assert g(x) == 321