fabf1c9334
I had a spare fifteen minutes and decided that I should tidy up my monorepo. The work of tidying up is not finished; this is a small step in the right direction. TL;DR - Created a tools directory - Created a scratch directory (see README.md for more information) - Added README.md to third_party - Renamed delete_dotfile_symlinks -> symlinkManager - Packaged symlinkManager as an executable symlink-mgr using buildGo
64 lines
1.7 KiB
Python
64 lines
1.7 KiB
Python
import unittest
|
|
|
|
|
|
def kth_to_last_node(k, x):
|
|
a, b = x, x
|
|
|
|
if k == 0:
|
|
raise Exception('Value of 0 for k is not supported')
|
|
|
|
for _ in range(k - 1):
|
|
if not a.next:
|
|
raise Exception('Value of {} for k is too large'.format(k))
|
|
a = a.next
|
|
|
|
while a.next:
|
|
a, b = a.next, b.next
|
|
return b
|
|
|
|
|
|
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_first_to_last_node(self):
|
|
actual = kth_to_last_node(1, self.first)
|
|
expected = self.fourth
|
|
self.assertEqual(actual, expected)
|
|
|
|
def test_second_to_last_node(self):
|
|
actual = kth_to_last_node(2, self.first)
|
|
expected = self.third
|
|
self.assertEqual(actual, expected)
|
|
|
|
def test_first_node(self):
|
|
actual = kth_to_last_node(4, self.first)
|
|
expected = self.first
|
|
self.assertEqual(actual, expected)
|
|
|
|
def test_k_greater_than_linked_list_length(self):
|
|
with self.assertRaises(Exception):
|
|
kth_to_last_node(5, self.first)
|
|
|
|
def test_k_is_zero(self):
|
|
with self.assertRaises(Exception):
|
|
kth_to_last_node(0, self.first)
|
|
|
|
|
|
unittest.main(verbosity=2)
|