private String getServices() {
        return "<services version='1.0'>\n" +
                contentClusters.stream().map(cluster -> cluster.getXml() + "\n").reduce("", (acc, element) -> acc + element) +
                "</services>";
    }
Class for building an application package with content clusters (used for testing only).

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