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Mockito Cookbook by Marcin Grzejszczak

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Creating custom AssertJ assertions

In this recipe, we will create a custom AssertJ assertion. Please refer to the previous recipe for the presented assertions in the test because in the current recipe, we will combine them into our custom assertions:

Getting ready

For this recipe, our system under test will be a NewPersonGenerator class that will call an external service, NewIdentityCreator, to generate a new identity for the current person, as shown in the following code:

public class NewPersonGenerator { private final NewIdentityCreator newIdentityCreator; public NewPersonGenerator(NewIdentityCreator newIdentityCreator) { this.newIdentityCreator = newIdentityCreator; } public Person generateNewIdentity(Person person) { String newName = newIdentityCreator.createNewName(person); ...

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