def test_delete_updates_length(self):
"""
Updates the correct length of the cache
"""
cache = LRUCache(10)
cache.add_value(1)
before_delete = cache.length()
cache.delete_value(1)
after_delete = cache.length()
self.assertEqual(before_delete, 1)
self.assertEqual(after_delete, 0)
def test_delete_sets_front_and_back_to_none(self):
"""
Sets front and back references to None
"""
cache = LRUCache(100)
cache.add_value(1)
cache.delete_value(1)
front_value = cache._front
back_value = cache._back
self.assertEqual(front_value, None)
self.assertEqual(back_value, None)
def test_sets_new_front_correctly(self):
"""
Sets the new front of the cache correctly
when deleting the front value
"""
cache = LRUCache(10)
cache.add_value(1)
cache.add_value(2)
cache.add_value(3)
cache.delete_value(3)
result = cache._front.get_value()
self.assertEqual(result, 2)
def test_sets_new_back_correctly(self):
"""
Sets the new back of the cache correctly
when deleting the back value
"""
cache = LRUCache(10)
cache.add_value(1)
cache.add_value(2)
cache.add_value(3)
cache.delete_value(1)
result = cache._back.get_value()
self.assertEqual(result, 2)
def test_returns_false_if_not_deleted(self):
"""
Returns False if the value is not deleted
or cannot be found in the cache
"""
cache = LRUCache(10)
result = cache.delete_value(1)
self.assertEqual(result, False)
def test_returns_true_if_deleted(self):
"""
Returns True if the value has been deleted
from the cache
"""
cache = LRUCache(100)
cache.add_value(1)
result = cache.delete_value(1)
self.assertEqual(result, True)
