private static FleetControllerOptions.Builder optionsAllowingZeroNodesDown() {
        FleetControllerOptions.Builder options = optionsWithZeroTransitionTime();
        options.setMinStorageNodesUp(10);
        options.setMinDistributorNodesUp(10);
        return options;
    }
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