Book Image

MOCKITO COOKBOOK

By : Grzejszczak
Book Image

MOCKITO COOKBOOK

By: Grzejszczak

Overview of this book

This is a focused guide with lots of practical recipes with presentations of business issues and presentation of the whole test of the system. This book shows the use of Mockito's popular unit testing frameworks such as JUnit, PowerMock, TestNG, and so on. If you are a software developer with no testing experience (especially with Mockito) and you want to start using Mockito in the most efficient way then this book is for you. This book assumes that you have a good knowledge level and understanding of Java-based unit testing frameworks.
Table of Contents (12 chapters)
11
Index

Stubbing void methods


In this recipe, we will stub a void method. A void method is one that doesn't return a value. Remember that since we want to partially stub a mock, it most likely means that our class is doing too much, and that is quite true for this scenario. It is best practice to not write such code – always try to follow the SOLID principles.

Getting ready

For this recipe, our system under test will be the PersonDataUpdator class, which delegates most of the work to its collaborator, TaxFactorService. The latter calculates the mean value of the tax factor (for simplicity, it's a fixed value) and then updates the person's tax data via a web service (since it's a simple example, we do not have any real web service calls):

public class PersonDataUpdator {

  private final TaxFactorService taxFactorService;

  public PersonDataUpdator(TaxFactorService taxFactorService) {
    this.taxFactorService = taxFactorService;
  }

  public boolean processTaxDataFor(Person person) {
    try {
 ...