public SimpleConfigProducer withChildren(TreeConfigProducer<?>... producer) {
            List.of(producer).forEach(this::addChild);
            return this;
        }
NOTE: This test method has the following assumptions about the {@link com.yahoo.vespa.model.VespaModel}:
   1) verbosegc and heapsize in qr-start.def is marked with restart.
   2) {@link com.yahoo.vespa.model.container.Container} class has QrStartConfig listed in its
      {@link com.yahoo.vespa.model.application.validation.RestartConfigs} attribute.
   3) That the config ids for the container services have a specific value.

This test will to a certain degree ensure that the annotations in the VespaModel is correctly applied.
config-model/src/test/java/com/yahoo/vespa/model/application/validation/change/ConfigValueChangeValidatorTest.java