private ContentCluster getOneGroupCluster() throws Exception {
        String groupXml = joinLines("  <group>",
                          "    <node distribution-key='0' hostalias='mockhost'/>",
                          "    <node distribution-key='1' hostalias='mockhost'/>",
                          "    <node distribution-key='2' hostalias='mockhost'/>",
                          "  </group>", "");
        return createCluster(createClusterXml(groupXml, 2, 2));
    }
Unit tests for hierarchic distribution in an indexed content cluster.

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