Add Spring StaticApplicationContext

It is a common way that developers programmatically register beans into context specially in testing rather than reading bean definitions from external configuration sources, in this case, you need to use StaticApplicationContext.

As far as my experience concerned, there are some circumstances that you need to have populated context when you are testing

1. for registering mock objects into context

let's assume we inject a DAO into a service and we want to mock DAO then test our service

public class MockTest(){

  @Mock
  Dao dao;

  public void testMethod(){
   ctx.getBeanFactory().registerSingleton(dao.getClass().getName(), dao);
  }

}

2. for specifying classes not packages

sometimes you need to create a spring context by only some specific classes from different packages not the whole packages.
It might be good idea to have an annotation ClassToScan({}) to define whcih classes, you want to scan