Verifying the method invocation count with atMost()

In this recipe, we will verify whether a method on a mock was executed, at most, a specified number of times.

Getting ready

As shown in the following code, our system under test is TaxUpdater (the same as that presented in the previous recipes):

public class TaxUpdater {

    static final double MEAN_TAX_FACTOR = 10.5;

    private final TaxService taxService;

    public TaxUpdater(TaxService taxService) {
        this.taxService = taxService;
    }

    public void updateTaxFactorFor(Person brother, Person sister) {
        taxService.updateMeanTaxFactor(brother, calculateMeanTaxFactor());
        taxService.updateMeanTaxFactor(sister, calculateMeanTaxFactor());
    }

    private double calculateMeanTaxFactor() {
        return MEAN_TAX_FACTOR;
    }

}

How to do it...

To verify whether the mock's method was invoked at most a given number of times, call Mockito.verify(mock, VerificationMode.atMost(count)).methodToVerify(...).

Let's check the...