private Autoscaling suggestionOf(ApplicationId app, ClusterSpec cluster, ProvisioningTester tester) {
        return suggestionsOf(app, cluster, tester).get(0);
    }
Tests the scaling suggestions maintainer integration.
The specific suggestions are not tested here.

@author bratseth
node-repository/src/test/java/com/yahoo/vespa/hosted/provision/maintenance/ScalingSuggestionsMaintainerTest.java