def test_delete_at_index_below_0(self):
'''
When trying to delete a node at a given position.
1. Index must be below 0.
2. LookupError Expected.
'''
ll = LinkedList()
some_value = "Delete me"
ll.append("s")
ll.append("d")
ll.append(some_value)
ll.append("45")
with self.assertRaises(LookupError):
ll.delete_at(-1)
def test_delete_at_index_above_or_equal_to_size(self):
'''
When trying to delete a node at a given position.
1. Index must be equal or above size.
2. LookupError Expected.
'''
ll = LinkedList()
some_value = "Delete me"
ll.append("s")
ll.append("d")
ll.append(some_value)
ll.append("45")
with self.assertRaises(LookupError):
ll.delete_at(ll.size)
def test_delete_at_index(self):
'''
When trying to delete a node at a given position.
1. Delete a node at a desired index.
2. index must not be present in the list.
'''
ll = LinkedList()
some_value = "Delete me"
ll.append("s")
ll.append("d")
ll.append(some_value)
ll.append("45")
self.assertEqual(ll.delete_at(2), some_value)
self.assertFalse(ll.is_present(some_value))