private ContentCluster getIllegalMultipleGroupsLevelCluster() throws Exception {
        String groupXml = joinLines("  <group>",
                "    <distribution partitions='2|*'/>",
                "    <group distribution-key='0' name='group0'>",
                "      <distribution partitions='1|*'/>",
                "      <group distribution-key='0' name='group00'>",
                "        <node distribution-key='0' hostalias='mockhost'/>",
                "      </group>",
                "      <group distribution-key='1' name='group01'>",
                "        <node distribution-key='1' hostalias='mockhost'/>",
                "      </group>",
                "    </group>",
                "  </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