def test_deferred_fn_terminated():
incsum = dream.map(lambda n: n + 1).into(sum)
assert incsum(range(3)) == 6
def test_composability():
inc = dream.map(lambda n: n + 1)
double = dream.map(lambda n: n * 2)
assert inc.into(double).of(range(3)).into(set) == {2, 4, 6}
def test_deferred_source():
inc = dream.map(lambda n: n + 1)
assert inc.of(range(3)).into(sum) == 6
