def test_equals_2(self):
     self.assertEqual(palindrome_chain_length(1), 0)
 def test_equals_5(self):
     self.assertEqual(palindrome_chain_length(10), 1)
 def test_equals(self):
     self.assertEqual(palindrome_chain_length(87), 4)
 def test_equals_4(self):
     self.assertEqual(palindrome_chain_length(89), 24)