node = getInstance(getA(3));
ValueNode<Double> res2 = node.calc(null);
assertTrue(res2.getValue().compareTo(Math.ceil(1.)) == 0);
node = getInstance(getA(4));
res2 = node.calc(null);
assertTrue(res2.getValue().compareTo(Math.ceil(-1.)) == 0);
node = getInstance(getA(5));
res2 = node.calc(null);
assertTrue(res2.getValue().compareTo(Math.ceil(0.)) == 0);