Mockito Cookbook

Stubbing methods so that they return custom answers

In this recipe, we will stub a method that returns a value so that it returns a custom answer of our choice.

Getting ready

For this recipe, our system under test will again be MeanTaxFactorCalculator, which calls TaxFactorFetcher twice to get a tax factor for the given person, and then calculates a mean value for those two results as follows:

public class MeanTaxFactorCalculator { private final TaxFactorFetcher taxFactorFetcher; public MeanTaxFactorCalculator(TaxFactorFetcher taxFactorFetcher) { this.taxFactorFetcher = taxFactorFetcher; } public double calculateMeanTaxFactorFor(Person person) { double taxFactor = taxFactorFetcher.getTaxFactorFor(person); double anotherTaxFactor = taxFactorFetcher.getTaxFactorFor(person); ...