How to write Unit Tests for injected Springboot service-CodePudding

This is the my UploadClass. And it uploads a file to the S3 bucket using S3Client.

 public class UploadClass{
     @Override
     public void upload(){
          ObjectMetadata metadata = new ObjectMetadata();
          metadata.setContentLength(length);
          PutObjectResult putObjectResult =
                  this.s3Client.putObject(container, object, data, metadata);
        }
    }

This is the MyClass and here I have injected the the UploadClass via constructor injection and have used the upload() method of UploadClass.

     @Service
        public class MyClassServiceImpl implements MyClassService{
        
          private final UploadClass uploadClass;
         
         @Autowired
          MyClass(final UploadClass uploadClass) {
            this.uploadClass = uploadClass;
        
          }
        
         @Override
          public void process() {
......................Some other work ...................
.....................................................
......................................................
            this.uploadClass.upload();
          }
        }

Now I am trying to write Unit tests for the process method in MyClass.And I need to mock the UploadClass using mockito and need to use mock output value for upload() method.This is my MyClassServiceTest class.How can I do this ?

@SpringBootTest
public class MyClassServiceTest{

 @Test
 void processTest() {

}
}

CodePudding user response：

With given code there is no much to test - only if upload method has been called.

@SpringBootTest
public class MyClassServiceTest{
  
@Autowired
 private  MyClassService myService; 
@MockBean
private UploadClass uploadClass
 
 @Test
 void processTest() {
    myService.process();
    //do some assertions
    //.....
    
    verify(uploadClass,times(1)).upload(); //assert that uplaod has been called
}

This could be done using plain JunitRunner and Mockito. No need for complete app context.