def test_is_present_false(self):
'''
When trying to find out if a value is present in the list.
1. The value must be previously inserted.
2. When method is called, False is expected.
'''
ll = LinkedList()
some_value = "gutentag"
ll.append("alo")
ll.append("aloha")
ll.append("Konnichiwa")
self.assertFalse(ll.is_present(some_value))
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))