@Test
    void cluster_state_bundles_contain_distribution_config_if_feature_is_enabled() throws Exception {
        var f = new DistributionConfigInBundleFixture(true);
        var bundleCfg = ctrl.getClusterStateBundle().distributionConfig();
        assertTrue(bundleCfg.isPresent());
        assertEquals(f.bootstrapConfig, bundleCfg.get().config());
    }
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