old_contents: from nose.tools import raises, assert_raises
  
  import unittest
  
  from ex771 import Solution
  
  class TestClass:
      def setup(self):
          self.solution = Solution()
  
      def test_empty_jewels(self):
          result = self.solution.numJewelsInStones("", "ABC")
          assert result == 0
   
      def test_non_empty_jewels(self):
          result = self.solution.numJewelsInStones("AB", "AAACBBL")
          assert result == 5
   
      def test_mixed_case_jewels(self):
          result = self.solution.numJewelsInStones("aA", "aAAbbbb")
          assert result == 3
  
  if __name__ == "__main__":
      unittest.main()
new_contents: import unittest
  
  from leetcode.ex771 import Solution
  
  
  class TestClass(unittest.TestCase):
  
      def setUp(self):
          self.solution = Solution()
  
      def test_empty_jewels(self):
          result = self.solution.numJewelsInStones("", "ABC")
          assert result == 0
   
      def test_non_empty_jewels(self):
          result = self.solution.numJewelsInStones("AB", "AAACBBL")
          assert result == 5
   
      def test_mixed_case_jewels(self):
          result = self.solution.numJewelsInStones("aA", "aAAbbbb")
          assert result == 3
  
  
  if __name__ == "__main__":
      unittest.main()
subject: Remove redundant imports