old_contents: import unittest
  from unittest.mock import MagicMock
  from dotty_dict import dotty
  
  
  class TestDottyCache(unittest.TestCase):
  
      def test_getitem_cache(self):
          dot = dotty()
          dot._data = MagicMock()
          for i in range(10):
              dot.get('x.y.z')
          self.assertEqual(dot.__getitem__.cache_info().hits, 9)
  
new_contents: import unittest
  from unittest.mock import MagicMock
  
  from dotty_dict import dotty
  
  
  class TestDottyCache(unittest.TestCase):
  
      def test_getitem_cache(self):
          dot = dotty()
          dot._data = MagicMock()
          for _ in range(10):
              dot.get('x.y.z')
          self.assertEqual(dot.__getitem__.cache_info().hits, 9)
  
subject: Resolve flake8 lint problems