def test_natual_string(self): self.assertRaises(ValueError, lambda: types.natural('foo'))
def test_natual_negative(self): self.assertRaises(ValueError, lambda: types.natural(-1))
def test_natual(self): self.assertEquals(3, types.natural(3))
def test_natual_string(self): with self.assertRaises(ValueError): types.natural('foo')
def test_natural(self): assert_equal(3, types.natural(3))
def test_natual_negative(self): with self.assertRaises(ValueError): types.natural(-1)