private String getRoundRobinDispatchXml() {
        return joinLines("<tuning>",
                "  <dispatch>",
                "    <dispatch-policy>round-robin</dispatch-policy>",
                "  </dispatch>",
                "</tuning>");
    }
Unit tests for hierarchic distribution in an indexed content cluster.

@author geirst
config-model/src/test/java/com/yahoo/vespa/model/content/IndexedHierarchicDistributionTest.java