Archive for May 12th, 2011

May 12, 2011

Testing asynchronous services with Mockito

by Stefan

Programming asynchronous services can be really challenging. Examples are asynchronous webservices, GWT server calls or event-based systems like widget toolkits. Usually, clients have to pass a callback to the service on which a method is called on success or error containing the data to proceed or an error message.
A typical asynchronous system is your local pizza service:

package cleancodematters;

public class PizzaService {

  public interface PizzaEvent {
    void pizzaAvailable( Pizza pizza );

  public void orderPizza( String name, PizzaEvent event ) {
    // some async processing, calls event on finish

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