old_contents: import unittest
  from ..util import LazyFile
  
  
  class TestUtil(unittest.TestCase):
      def test_lazy_file(self):
          file = LazyFile('LICENSE.txt')
          self.assertTrue(file.file is None)
          iter(file)
          handle_0 = file.file
          iter(file)
          handle_1 = file.file
          self.assertTrue(handle_0.closed)
          self.assertFalse(handle_1.closed)
  
new_contents: import unittest
  from ..util import LazyFile
  
  
  class TestUtil(unittest.TestCase):
      def test_lazy_file(self):
          license_file = LazyFile('LICENSE.txt')
          self.assertTrue(license_file.file is None)
          iter(license_file)
          handle_0 = license_file.file
          iter(license_file)
          handle_1 = license_file.file
          self.assertTrue(handle_0.closed)
          self.assertFalse(handle_1.closed)
  
subject: fix style error