text: from unittest import TestCase
  from longestPalindromeSubseq import Solution
  
  class TestSolution(TestCase):
      def test_longestPalindrome02(self):
          self.assertEqual(Solution().longestPalindrome02('abccba'), 'abccba')
          
      def test_longestPalindrome02_1(self):
          self.assertEqual(Solution().longestPalindrome02('a'), 'a')
      
      def test_longestPalindrome02_2(self):
          self.assertEqual(Solution().longestPalindrome02('aba'), 'aba')