def test_1():
it = NestedIterator([NestedInteger([NestedInteger(1), NestedInteger(1)]),
NestedInteger(2),
NestedInteger([NestedInteger(1),
NestedInteger([NestedInteger(4),
NestedInteger(6)])]),
NestedInteger(9)])
res = []
while it.hasNext():
res.append(it.next())
assert res == [1, 1, 2, 1, 4, 6, 9]
def test_0():
it = NestedIterator([])
assert not it.hasNext()
it = NestedIterator([NestedInteger(1)])
assert it.hasNext()
assert it.next() == 1
assert not it.hasNext()
it = NestedIterator([NestedInteger([NestedInteger([NestedInteger(1)])])])
assert it.hasNext()
assert it.next() == 1
assert not it.hasNext()
