Mastering Kotlin

Exercising Java code from Kotlin

Another means of using tests to exercise and improve interop between Java and Kotlin is to use Kotlin code to test our Java code and vice versa. By using Kotlin to test Java, we can test more efficiently by taking advantage of Kotlin features such as data classes and the Kotlin standard library.

To explore this testing interplay between Java and Kotlin, let's walk through an example. Here, we've created a simple Java class called StudentPresenter:

public class StudentPresenter {    private List<Student> students;    public StudentPresenter(List<Student> students) {        students.sort(Comparator.comparing(Student::getLastName));        this.students = students;    }    public List<Student> getStudents() {        return students;    }}

We can ...