如何使用 Mockito 模拟这段 Spring Boot 代码？答案

【问题标题】：How can I mock this piece of code of Spring Boot using Mockito?如何使用 Mockito 模拟这段 Spring Boot 代码？
【发布时间】：2022-01-13 10:20:06
【问题描述】：

考虑：

return attachmentList.stream().map(attachment -> {
    AttachmentBO attachmentBO = new AttachmentBO();
    attachmentBO.setId(attachment.getId());
    attachmentBO.setTitle(attachment.getName());
    attachmentBO.setType(attachment.getValue().get("type").toString());
    attachmentBO.setCreatorId(attachment.getAuditUserId());
    String[] filteredPermissionsForNote = this.filterPermissionCommand.filterPermissions(answer.getTopicId(), attachment.getAuditUserId(), topicDetails.getPermissions(), topicDetails.getEffectiveRoles(), true);
    attachmentBO.setPermissions(filteredPermissionsForNote);

    if (attachmentBO.getType().equalsIgnoreCase("URL")) {
        attachmentBO.setUrl(String.valueOf(attachment.getMediaInfo().get("url")));
    } else if (attachmentBO.getType().equalsIgnoreCase("FILE")) {
        attachmentBO.setSize((Double) attachment.getValue().get("size"));
    }

    return attachmentBO;
}).collect(Collectors.toList());

我已经使用 Mockito 模拟了附件列表，所以我得到了附件列表。但是我应该如何模拟剩下的代码呢？我什至嘲笑过过滤器权限。

【问题讨论】：

1) 你想测试什么？ 2）也许只是使用预定义的列表而不是模拟它？
我正在测试我的控制器，所以我在我的控制器中注入了这个服务，上面的代码是我的服务层的。
您到底想测试什么：该服务的方法是用正确的参数调用的，还是您正在编写集成测试？
（Stack Overflow 上的语法高亮显示：为什么变量“attachmentBO”在声明中的颜色与其使用位置不同？为什么（数组）变量“@”不同987654324@" in this question?)

标签： java spring-boot mockito

【解决方案1】：

不要模拟列表元素。取而代之的是模拟更高的级别以返回一个测试列表。

澄清一下：

List<Attachment> attachmentList = List.of(RealAttachment1, RealAttachment2); // <-- Nothing is using Mockito here.

when(someMethodWhichReturnsAttachmentList()).thenReturn(attachmentList);

然后在你的业务逻辑中：

attachmentList = someMethodWhichReturnsAttachmentList(); // Mockito will return you the test list you created earlier.


// You will now map the test List elements, as in a normal business logic
return attachmentList.stream().map(attachment -> {
    AttachmentBO attachmentBO = new AttachmentBO();
    attachmentBO.setId(attachment.getId());
    attachmentBO.setTitle(attachment.getName());
    attachmentBO.setType(attachment.getValue().get("type").toString());
    attachmentBO.setCreatorId(attachment.getAuditUserId());
    String[] filteredPermissionsForNote = this.filterPermissionCommand.filterPermissions(answer.getTopicId(), attachment.getAuditUserId(), topicDetails.getPermissions(), topicDetails.getEffectiveRoles(), true);
    attachmentBO.setPermissions(filteredPermissionsForNote);

    if (attachmentBO.getType().equalsIgnoreCase("URL")) {
        attachmentBO.setUrl(String.valueOf(attachment.getMediaInfo().get("url")));
    } else if (attachmentBO.getType().equalsIgnoreCase("FILE")) {
        attachmentBO.setSize((Double) attachment.getValue().get("size"));
    }

    return attachmentBO;
}).collect(Collectors.toList());

业务逻辑将返回您在测试中创建的List.of(attachments)，并运行所有这些，包括map/collect。

【讨论】：