def test_basic(total, maxval):
result = list(magic_tuples(total,maxval))
assert all([t[0] <= maxval and t[1] <= maxval
for t in result])
assert all([sum(t) == total
for t in result])
def test_zeroes():
assert list(magic_tuples(0, 0)) == []
def test_impossible():
result = list(magic_tuples(100, 3))
assert len(result) == 0
def test_is_iterator():
result = magic_tuples(10, 10)
assert iter(result) == result