public TestRoot buildModel(ApplicationPackage applicationPackage) {
        return buildModel(new DeployState.Builder().applicationPackage(applicationPackage).build());
    }
Build a model from an application package.

@param applicationPackage Any type of application package.
@return a producer root capable of answering getConfig requests.
config-model/src/main/java/com/yahoo/config/model/test/TestDriver.java