def test_remove_first(self):
s_list = bidirectional_list.LinkedList2()
s_list.add_in_tail(n1)
s_list.add_in_tail(n2)
s_list.add_in_tail(bidirectional_list.Node2(20))
s_list_remove_first = bidirectional_list.LinkedList2()
s_list_remove_first.add_in_tail(bidirectional_list.Node2(55))
s_list_remove_first.add_in_tail(bidirectional_list.Node2(20))
s_list.remove(12)
test = s_list.test_list()
test1 = s_list_remove_first.test_list()
self.assertEqual(test, test1)
def test_add_in_head(self):
s_list = bidirectional_list.LinkedList2()
s_list.add_in_tail(n1)
s_list.add_in_tail(n2)
s_list.add_in_tail(bidirectional_list.Node2(20))
s_list_add = bidirectional_list.LinkedList2()
s_list_add.add_in_tail(bidirectional_list.Node2(1))
s_list_add.add_in_tail(bidirectional_list.Node2(12))
s_list_add.add_in_tail(bidirectional_list.Node2(55))
s_list_add.add_in_tail(bidirectional_list.Node2(20))
s_list.add_in_head(bidirectional_list.Node2(1))
test = s_list.test_list()
test1 = s_list_add.test_list()
self.assertEqual(test, test1)
def test_insert(self):
s_list = bidirectional_list.LinkedList2()
s_list.add_in_tail(n1)
s_list.add_in_tail(n2)
s_list.add_in_tail(bidirectional_list.Node2(20))
s_list_insert = bidirectional_list.LinkedList2()
s_list_insert.add_in_tail(bidirectional_list.Node2(12))
s_list_insert.add_in_tail(bidirectional_list.Node2(13))
s_list_insert.add_in_tail(bidirectional_list.Node2(55))
s_list_insert.add_in_tail(bidirectional_list.Node2(20))
s_list.insert(bidirectional_list.Node2(13),
bidirectional_list.Node2(12))
test = s_list.test_list()
test1 = s_list_insert.test_list()
self.assertEqual(test, test1)