def test4(self): self.assertEqual(lib.diff21(22), 2)
def test2(self): self.assertEqual(lib.diff21(10), 11)
def test3(self): self.assertEqual(lib.diff21(21), 0)
def test11(self): self.assertEqual(lib.diff21(-2), 23)
def test7(self): self.assertEqual(lib.diff21(0), 21)
def test9(self): self.assertEqual(lib.diff21(2), 19)
def test8(self): self.assertEqual(lib.diff21(1), 20)
def test6(self): self.assertEqual(lib.diff21(30), 18)
def test5(self): self.assertEqual(lib.diff21(25), 8)
def test10(self): self.assertEqual(lib.diff21(-1), 22)
def test12(self): self.assertEqual(lib.diff21(50), 58)
def test1(self): self.assertEqual(lib.diff21(19), 2)