在没有应用程序的情况下测试Spring / SpringBoot

Question

I want to write integration tests that will have to use Spring Framework and a custom JPA provider. Straightforward answer as I thought would be to create a test class and annotate it as follows:

@RunWith(SpringRunner.class)
@SpringBootTest
public class Test { ...

Hoping for the all of the default auto-configuration required to happen on its own. But it doesn't the error is:

java.lang.IllegalStateException: Unable to find a @SpringBootConfiguration, you need to use @ContextConfiguration or @SpringBootTest(classes=...) with your test

Can I avoid creating the:

@SpringBootApplication
public class TestApp { ...

and only use src/test/java folder and provide configuration with "@SpringBootTest(classes=...)"? What kind of configuration class do I need then?

Answer 1

I just got the problem let me go back to begining; First add a configuration class ApplicationContainer

public final class ApplicationContainer {
private static volatile ApplicationContainer singleton;
private ApplicationContext context;
private ApplicationContainer()
{
}

public static ApplicationContainer getInstance()
{
    if(ApplicationContainer.singleton == null)
    {
        synchronized(ApplicationContainer.class)
        {
            if(ApplicationContainer.singleton == null)
            {
                ApplicationContainer.singleton = new ApplicationContainer();
            }
        }
    }
    return ApplicationContainer.singleton;
}

public void setApplicationContext(ApplicationContext context)
{
    this.context = context;
}

public <T> T getBean(Class<T> requiredType)
{
    if(this.context == null)
    {
        throw new IllegalStateException("ApplicationContainer is not started");
    }
    return this.context.getBean(requiredType);
}

public void start()
{
    if(this.context == null)
    {
        this.context = new AnnotationConfigApplicationContext(ApplicationConfig.class);
    }
}

public void stop()
{
    if(this.context == null)
    {
        return;
    }

    if(this.context instanceof AnnotationConfigApplicationContext)
    {
        ((AnnotationConfigApplicationContext)this.context).close();
    }
    this.context = null;
}

@Configuration
@ComponentScan("com.domain.package")
public static class ApplicationConfig
{
    }}    

And change your test class's like that:

@RunWith(SpringRunner.class)
@SpringBootTest(classes = {ApplicationContainer.ApplicationConfig.class})
public class YourTestIT {
@Autowired
private ApplicationContext applicationContext;
@Before
public void up() {
    ApplicationContainer.getInstance().setApplicationContext(this.applicationContext);
}
@After
public void down() {
    ApplicationContainer.getInstance().stop();
}
//test cases
}

then you can @Autowired your repository classes and use directly also you should add IT extension your test class name.