@Override
            int expectedMessageCount(final DummyVdsNode node) {
                return node.getNode().equals(new Node(NodeType.STORAGE, 1)) ? 0 : 2;
            }
Class for testing states of all nodes. Will fail in constructor with
debug message on non-expected results.
clustercontroller-core/src/test/java/com/yahoo/vespa/clustercontroller/core/StateChangeTest.java