def test7(): assert add(-2, -8) == -10
def test2(): assert add(111, 899) == 1010 assert add2(111, 899) == 1010
def test1(): assert add(1, 2) == 3 assert add2(1, 2) == 3
def test6(): assert add(0, -4) == -4
def test5(): assert add(3, 0) == 3 assert add2(3, 0) == 3
def test4(): assert add(1, -2) == -1
def test3(): assert add(-1, 2) == 1