assertTrue(res.getValue().compareTo(2) == 0);
node =
getInstance(new ListNode(toList(new MultNode(new ValueNode<>(2),
new ValueNode<>(-2.)))));
res = node.calc(null);
assertTrue(res.getValue().compareTo(1) == 0);
node =
getInstance(new ListNode(toList(new MultNode(new ValueNode<>(2),
new ValueNode<>(-2.)), new MultNode(new ValueNode<>(2),