如何在 JMockit Expectations 中模拟具有通用返回类型的函数

问题描述

我希望被模拟的方法返回一个特定的类而不是超类，但是抛出了一个 ClassCastException。不确定如何正确定义期望。任何帮助将不胜感激。

@Component
public class PeopleService {

    public <T extends People> T changeName(T person) {
        person.setName("DifferentName");
        return person;
    }
}

@Component
@requiredArgsConstructor
public class StudentService {

    private final PeopleService peopleService;

    public Student retrieveStudent() {
        Student student = new Student();
        student.setName("name");
        student.setId("id");
        return peopleService.changeName(student);
    }
}

public class StudentServiceTest {

    @Injectable
    private PeopleService peopleService;

    @Tested
    private StudentService target;

    @Test
    public void test_retrieveStudent_Pass() {
        Student student = new Student();

        new Expectations(){{
            peopleService.changeName(student);
            result = student;
        }};

        Student output = target.retrieveStudent();
    }
}

java.lang.classCastException: People cannot be cast to Student
    at StudentService.retrieveStudent(StudentService.java:16)
    at StudentServiceTest.test_retrieveStudent_Pass(StudentServiceTest.java:23)

解决方法

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jmockit junit junit