Junit in Spring Boot keeps failing

Question

I have very simple SpringBoot Junit but it keeps failing.

@RunWith(SpringRunner.class)
//@SpringBootTest
@WebMvcTest(TokenServiceImpl.class)
public class TokenTest {


    @Test
    public void getOauthToken()
    {

        System.out.println( " done test");

    }

my TokenServiceImpl class has

public class TokenServiceImpl implements TokenService{
public String  getToken() throws RuntimeException{
          return  " Token returned"  ;  
    }

I get the below error : -Snippet

2019-11-27 19:12:45.884 WARN 15864 --- [ main] o.s.w.c.s.GenericWebApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'runApplication': Unsatisfied dependency expressed through field 'job'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'job' defined in class path resource [com/mycompany/project1/batch/configurations/BatchBDREntityConfig.class]: Unsatisfied dependency expressed through method 'job' parameter 4; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'batchDBWriter': Unsatisfied dependency expressed through field 'BDREntityRepository'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.mycompany.project1.batch.repositories.BDREntityRepository' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}

Field BDREntityRepository in com.mycompany.project1.batch.services.BatchDBWriter required a bean of type 'com.mycompany.project1.batch.repositories.BDREntityRepository' that could not be found.

Consider defining a bean of type 'com.mycompany.project1.batch.repositories.BDREntityRepository' in your configuration.

Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'runApplication': Unsatisfied dependency expressed through field 'job'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'job' defined in class path resource [com/mycompany/project1/batch/configurations/BatchBDREntityConfig.class]: Unsatisfied dependency expressed through method 'job' parameter 4; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'batchDBWriter': Unsatisfied dependency expressed through field 'BDREntityRepository'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.mycompany.project1.batch.repositories.BDREntityRepository' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}

Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'batchDBWriter': Unsatisfied dependency expressed through field 'BDREntityRepository'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.mycompany.project1.batch.repositories.BDREntityRepository' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}

Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.mycompany.project1.batch.repositories.BDREntityRepository' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}

My main method has following

@SpringBootApplication
@ComponentScan(basePackages= {"com.mycompany.project1"})
public class RunApplication{


    private static final Logger logger = Logger.getLogger(BatchController.class);

    @Autowired 
    JobLauncher jobLauncher;

    @Autowired 
    Job job;

    /*
     * jmxBean will get loaded when this managed bean is called from RMI, and it will fire batch execution
     */
    public static void main(String[] args){

        ApplicationContext app = SpringApplication.run(RunApplication.class, args);
        logger.debug("Batch Application has been started...");
        BatchController controller =    app.getBean(BatchController.class);
        //Start batch process when application starts or restart, its optional call and can be commented out
        //as we have JMX to expose load method on demand
        //BatchController batch = new BatchController();
        controller.startBatchProessFromMain();

    }
}

@Component
public class BatchDBWriter implements ItemWriter<BDREntity> {

    private static final Logger logger = Logger.getLogger(BatchDBWriter.class);

    @Autowired
    private BDREntityRepository bDREntityRepository;

    /*
     * this method call the JPArepository's saveAll
     * function and saves all the list of bdrEntitiesat a time.
     */
    @Override
    public void write(List<? extends BDREntity> bdrEntities) throws Exception {

        bDREntityRepository.saveAll(bdrEntities);
    }
}

How can i fix my Junit ?

Answer 1

You are using @WebMvcTest that is a test-slice annotation. It's specifically intended for testing the WebMvc-related components in your application and is a form of integration test.

You've said in the comments that you're not trying to integration test your application. In that case, you should not be using @SpringBootTest or any of the other @…Test annotations that are provided by Spring Boot.

Assuming that your goal is to unit test TokenServiceImpl, I'd expect your test class to look something like this:

public class TokenTest {

    private final TokenServiceImpl tokenService = new TokenServiceImpl();

    @Test
    public void getOauthToken() {
        String token = this.tokenService.getToken();
        // Assertions to check the token go here
    }

}