def test_one_odd_node(self):
node = Node(3)
one_odd_list = LinkedList()
one_odd_list.add_node(node)
one_odd_list.remove_odds()
"it should produce and empty list has only one node, which is odd"
self.assertTrue(one_odd_list.is_empty())
def test_empty_list(self):
empty_list = LinkedList()
empty_list.remove_odds()
self.assertTrue(empty_list.is_empty())