def test_equals_2(self): self.assertEqual(persistence(4), 0)
def test_equals_4(self): self.assertEqual(persistence(999), 4)
def test_equals(self): self.assertEqual(persistence(39), 3)
def test_equals_3(self): self.assertEqual(persistence(25), 2)
def test_equals_2(self): self.assertEqual(persistence(4), 0)
def test_equals_4(self): self.assertEqual(persistence(999), 4)
def test_equals(self): self.assertEqual(persistence(39), 3)
def test_equals_3(self): self.assertEqual(persistence(25), 2)