def test_satisfies_any(self):
p_list = []
p_list.append(predicates.less_than(8))
p_list.append(predicates.less_than(6))
p_list.append(predicates.equal_to(4))
pred = predicates.satisfies_any(p_list)
assert pred(4), "4 satisfies all predicates in the list"
assert pred(5), "5 satisfies only 2 predicates in the list"
assert pred(7), "7 satisfies only 1 predicate in the list"
assert not pred(9), "9 satisfies only no predicates in the list"
self.check_str(pred)
def test_less_than(self):
pred = predicates.less_than(2)
assert pred(1), "one is less than two"
assert pred(-1), "negative one is less than two"
assert not pred(2), "two is not less than two"
assert not pred(3), "three is not less than two"
self.check_str(pred)
def test_Implemented(self):
pred = predicates.less_than(2)
try:
pred.__call__(2)
except NotImplementedError:
assert (
False
), "invoking __call__ on an complete subclass of predicate failed"
try:
str(pred)
except NotImplementedError:
assert False, "invoking __str__ on an complete subclass of predicate failed"
assert True, "implemented predicate had no problems invoking functions"