def test_length(self):
'''
case12:测试length函数
1、当链表为空时，调用length函数，返回链表长度为0
2、原链表存在4个元素[1，2,'a','b'],调用length函数，返回链表长度为4
'''
'''step 1'''
temp_list = Llist()
value = temp_list.length()
self.assertEqual(value, 0, "value_info " + str(value))
'''step 2'''
temp_list.append(1)
temp_list.append(2)
temp_list.append('a')
temp_list.append('b')
value = temp_list.length()
self.assertEqual(value, 4, "value_info " + str(value))
def test_index_pop(self):
'''
case14:测试index_pop函数
1、当链表为空时，删除空链表中元素，抛出指定异常
2、当链表为[0,1,2,3,4,5,6]时，删除index=-1或7的元素，抛出指定异常
3、当链表为[0,1,2,3,4,5,6]时,删除index=5和index=1的元素，元素删除正确，删除后链表长度为5
4、当链表为[0,2,3,4,6]时,删除index=0，元素删除正确
5、当链表为[2,3,4,6]时,删除index=3，元素删除正确，删除后链表长度为3
'''
'''step 1'''
temp_list = Llist()
with self.assertRaisesRegexp(LinkedListOperateError, 'list is empty'):
temp_list.index_pop(0)
'''step 2'''
for i in xrange(7):
temp_list.append(i)
with self.assertRaisesRegexp(LinkedListOperateError,
'index is out of range'):
temp_list.index_pop(-1)
with self.assertRaisesRegexp(LinkedListOperateError,
'index is out of range'):
temp_list.index_pop(7)
'''step 3'''
value = temp_list.index_pop(5)
self.assertEqual(value, 5, "value_info " + str(value))
value = temp_list.index_pop(1)
self.assertEqual(value, 1, "value_info " + str(value))
value = temp_list.length()
self.assertEqual(value, 5, "value_info " + str(value))
'''step 4'''
value = temp_list.index_pop(0)
self.assertEqual(value, 0, "value_info " + str(value))
'''step 5'''
value = temp_list.index_pop(3)
self.assertEqual(value, 6, "value_info " + str(value))
value = temp_list.length()
self.assertEqual(value, 3, "value_info " + str(value))