assertTrue(res2.getValue().compareTo(1.) == 0);
node =
getInstance(new ListNode(toList(new MultNode(new ValueNode<>(2),
new ValueNode<>(-2.)))));
res2 = node.calc(null);
assertTrue(res2.getValue().compareTo(-4.) == 0);
node =
getInstance(new ListNode(toList(new MultNode(new ValueNode<>(2),
new ValueNode<>(-2.)), new MultNode(new ValueNode<>(2),