def test_intsum2():
g = gen.intsum2()
assert next(g) == 0
assert next(g) == 1
assert next(g) == 3
assert next(g) == 6
assert next(g) == 10
assert next(g) == 15
def test_intsum2():
g = gen.intsum2()
assert g.next() == 0
assert g.next() == 1
assert g.next() == 3
assert g.next() == 6
assert g.next() == 10
assert g.next() == 15
def test_intsum2():
g = gs.intsum2()
for val in [0, 1, 3, 6, 10]:
assert next(g) == val
def test_intsum2():
g = gs.intsum2()
for val in [0, 1, 3, 6, 10]:
assert next(g) == val
