def testIndex_Exception(self):
     r=DLList([1,2,'boy','cat',9])
     try:
         b=r.index('seed')
         self.assertTrue(False,'No Exception/or Right Type of Error Raised')
     except ValueError:
         pass
 def testIndex_start(self):
     r=DLList([1,2,'boy','cat',9])
     b=r.index(1)
     self.assertEqual(b,0)
 def testIndex_end(self):
     r=DLList([1,2,'boy','cat',9])
     b=r.index(9)
     self.assertEqual(b,4)
 def testIndex_mid(self):
     r=DLList([1,2,'boy','cat',9])
     b=r.index('boy')
     self.assertEqual(b,2)