JMockit - 意外调用答案

【问题标题】：JMockit - Unexpected invocationJMockit - 意外调用
【发布时间】：2019-12-05 11:36:02
【问题描述】：

我有一个使用 JMockit 进行单元测试的简单实现。具体实现如下

Team类

public class Team {
    private TeamLeader teamLeader;
    public Team(TeamLeader teamleader) {
        this.teamLeader = teamleader;
    }

    public boolean hasDiscussion() {
        System.out.println("Discussion is hold by " + teamLeader.getName());
        Discussion discussion = new Discussion();
        return discussion.start();
    }
}

TeamLeader类

public class TeamLeader {

    private String name;

    public TeamLeader(String name) {
        this.name = name;
    }

    public String getName() {
        return name;
    }
}

Discussion类

public class Discussion {

    public boolean start() {
        return false;
    }
}

然后，我有一个单元测试来测试函数hasDiscussion，如下所示

@RunWith(JMockit.class)
public class TeamTest {

    private Team team;

    @Test
    public void hasDiscussion(@Mocked TeamLeader teamLeader, @Mocked Discussion discussion) {

        new Expectations() {{
            teamLeader.getName(); result = "teamleader";
            discussion.start(); result = true;
        }};

        team = new Team(teamLeader);
        boolean actualResult = team.hasDiscussion();

        new Verifications() {{
            assertThat(actualResult, is(true));
        }};

    }
}

执行测试时出现以下错误

Unexpected invocation of:
entity.Discussion#Discussion()
   on instance: entity.Discussion@7b70deb2
when was expecting an invocation of:
entity.Discussion#start()
   on mock instance: entity.Discussion@6f93ad02
mockit.internal.UnexpectedInvocation: Unexpected invocation of:
entity.Discussion#Discussion()
   on instance: entity.Discussion@7b70deb2
when was expecting an invocation of:

对这类问题有什么想法吗？

【问题讨论】：

标签： java unit-testing junit jmockit

【解决方案1】：

这是因为您的 hasDiscussion 方法正在创建 Discussion 类的新实例，在这种情况下，您无法模拟它。为了解决这个问题，您可以接收Discuss 类作为方法的参数并发送模拟，我们在Team 类构造函数中注入Discuss 类。

【讨论】：