old_contents: import unittest
  from fleet import Fleet
  
  class ExpeditionTestCase(unittest.TestCase):
      def testFleetZero(self):
          self.assertRaises(ValueError, Fleet, 0)
      def testFleetOneMarks(self):
          fleet = Fleet(1)
          self.assertEqual(fleet.getImage(), "fleet_1_mark.png")
      def testFleetOneAllMarks(self):
          fleet = Fleet(1)
          marks = fleet.getAllImages()
          self.assertEqual(len(marks), 2)
          self.assertEqual(marks[0], "fleet_1_flagship_mark.png")
          self.assertEqual(marks[1], "fleet_1_mark.png")
      def testFleetTwoAllMarks(self):
          fleet = Fleet(2)
          marks = fleet.getAllImages()
          self.assertEqual(len(marks), 1)
          self.assertEqual(marks[0], "fleet_2_mark.png")
          
  if __name__ == "__main__":
      unittest.main()
new_contents: import unittest
  from fleet import Fleet
  
  class ExpeditionTestCase(unittest.TestCase):
      def testFleetZero(self):
          self.assertRaises(ValueError, Fleet, 0)
      def testFleetOneMarks(self):
          fleet = Fleet(1)
          self.assertEqual(fleet.getImage(), "fleet_1_mark.png")
      def testFleetOneNotSelectedMark(self):
          fleet = Fleet(1)
          self.assertEqual(fleet.getNotSelectedImage(), "fleet_1_mark_not_selected.png")
      def testFleetOneAllMarks(self):
          fleet = Fleet(1)
          marks = fleet.getAllImages()
          self.assertEqual(len(marks), 2)
          self.assertEqual(marks[0], "fleet_1_flagship_mark.png")
          self.assertEqual(marks[1], "fleet_1_mark.png")
      def testFleetTwoAllMarks(self):
          fleet = Fleet(2)
          marks = fleet.getAllImages()
          self.assertEqual(len(marks), 1)
          self.assertEqual(marks[0], "fleet_2_mark.png")
          
  if __name__ == "__main__":
      unittest.main()
subject: add unit test about fleet.getNotSelectedImage()