JMockit

Question

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 class

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 class

public class TeamLeader {

    private String name;

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

    public String getName() {
        return name;
    }
}

Discussion class

public class Discussion {

    public boolean start() {
        return false;
    }
}

然后，我有一个单元测试来测试功能hasDiscussion，如下

@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，出现如下错误

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？

Answer 1

发生这种情况是因为您的 hasDiscussion 方法正在创建 Discussion class 的新实例，在这种情况下，您不能模拟它。要解决这个问题，您可以接收 Discuss class 作为方法的参数并发送模拟，我们在 Team class 构造函数中注入讨论 class。

JMockit - 意外调用

JMockit - Unexpected invocation

java

unit-testing

junit