def deep(self):
n = int(1e4)
l = LazyList(List.wrap(range(n)))
l.index_of(n - 1).should.contain(n - 1)
def index_of(self):
l = LazyList(range(30), chunk_size=20)
l.index_of(21).should.contain(21)
l.index_of(49).should.be.empty
