blob: 4ed02ec30832aadedafc7c0a743cdde1a63988a2 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
|
import unittest
def delete_node(node):
if node.next:
node.value = node.next.value
node.next = node.next.next
else:
raise Exception(
"We cannot delete the last node in a linked list using this function"
)
# Tests
class Test(unittest.TestCase):
class LinkedListNode(object):
def __init__(self, value, next=None):
self.value = value
self.next = next
def get_values(self):
node = self
values = []
while node is not None:
values.append(node.value)
node = node.next
return values
def setUp(self):
self.fourth = Test.LinkedListNode(4)
self.third = Test.LinkedListNode(3, self.fourth)
self.second = Test.LinkedListNode(2, self.third)
self.first = Test.LinkedListNode(1, self.second)
def test_node_at_beginning(self):
delete_node(self.first)
actual = self.first.get_values()
expected = [2, 3, 4]
self.assertEqual(actual, expected)
def test_node_in_middle(self):
delete_node(self.second)
actual = self.first.get_values()
expected = [1, 3, 4]
self.assertEqual(actual, expected)
def test_node_at_end(self):
with self.assertRaises(Exception):
delete_node(self.fourth)
def test_one_node_in_list(self):
unique = Test.LinkedListNode(1)
with self.assertRaises(Exception):
delete_node(unique)
unittest.main(verbosity=2)
|
