当 class 注入限定符时，如何在单元测试中使用不同的实现

Question

I have a spring bean component which I want to unit test for example:

@Component
public class UploadRequestTasklet implements Tasklet {

    private final Uploader fileUploader;

    public UploadRequestTasklet(@Qualifier("mainUploader") final Uploader fileUploader) {
        this.fileUploader = fileUploader;
    }

    @Override
    public RepeatStatus execute(final StepContribution stepContribution,
                                final ChunkContext chunkContext) throws IOException, InterruptedException {
        
        Info result = fileUploader.remoteUpload(context, info);
      
        return RepeatStatus.FINISHED;
    }
}

I have multiple different implementation of Uploader interface. For production, I use the mainUploader which uploads files to remote server. For integration and unit test, I want to use the localFileUploader implementation. The uploader classes live outside of my project and I have imported these classes from another project using maven dependency.

My question is, how can I override the mainuploader and in unit test, use the localFileUploader version?

the class UploadRequestTasklet has Qualifier annotation specifying to use main implementation which I cannot seem to override in unit test.

Answer 1

You can use @Profile together with your interface Tasklet implementations, for example

    @Component
    @Profile("local")
    public class UploadRequestTasklet implements Tasklet {
    ...
}

for a run that set jvm args -Dspring.profiles.active=local if you want to run test by maven or gradle. But, if you want to do it by IDE you can set @ActiveProfiles("local") with your component

see more here