def test_15(self):
data = range(1, 10)
_mult = Stream(data).collect(Reduce(bi_func=op.mul))
self.assertTrue(_mult.present())
self.assertEqual(_mult.get(), factorial(9))
def test_14(self):
data = range(10)
_sum = Stream(data).collect(Reduce(bi_func=op.add))
self.assertTrue(_sum.present())
self.assertEqual(_sum.get(), sum(data))
