def ap2(self):
a = 17
b = 13
ja = Just(a)
jb = Just(b)
ja.product(jb).smap(_ + _).should.contain(a + b)
ja.ap2(jb, _ + _).should.contain(a + b)
def product_n(self):
m = Just(1).product3(Just(2), Just(3), Just(4))
m.flat_map4(lambda a, b, c, d: Just(b + d)).should.contain(6)
e = Just(1).product3(Just(2), Empty(), Just(4))
e.should.be.empty
def flat_map_n(self):
m = Just((1, 2, 3, 4))
m.flat_map4(lambda a, b, c, d: Just(b + d)).should.contain(6)
m.flat_map5.when.called_with(lambda a: a).should.throw(TypeError)
