title: Trying to write junit test in Spring with JavaConfig
body: <p>I am trying to write a junit test for my example project but don't know how to access the ApplicationContext in the jUnit Test:</p>
  
  <p>Here is the main class of the project that works:</p>
  
  <pre><code>public static void main(String[] args)
      {
          // in this setup, both the main(String[]) method and the JUnit method both specify that
          ApplicationContext context = new AnnotationConfigApplicationContext( HelloWorldConfiguration.class );
          MessageService mService = context.getBean(MessageService.class);
          HelloWorld helloWorld = context.getBean(HelloWorld.class);
  
          /**
           * Displaying default messgae
           */
          LOGGER.debug("Message from HelloWorld Bean: " + helloWorld.getMessage());
  
          /**
           *   Saving Message to database
           */
          Message message = new Message();
          message.setMessage(helloWorld.getMessage());
          mService.SaveMessage(message);
  
          /**
           * Settting new message in bean
           */
          helloWorld.setMessage("I am in Staten Island, New York");
          LOGGER.debug("Message from HelloWorld Bean: " + helloWorld.getMessage());
  
          /**
           * Saving Message in database.
           */
          message.setMessage(helloWorld.getMessage());
          mService.SaveMessage(message);
  
          /**
           * Getting messages from database
           *    - display number of message(s)
           *    - display each message in database
           */
          List&lt;Message&gt; myList = mService.listMessages();
          LOGGER.debug("You Have " + myList.size() + " Message(s) In The Database");
  
          for (Message i : myList)
          {
              LOGGER.debug("Message: ID: " + i.getId() + ", Message: " + i.getMessage() + ".");
          }
      }
  </code></pre>
  
  <p>Now here is the junit test:</p>
  
  <pre><code>@RunWith(SpringJUnit4ClassRunner.class)
  @ContextConfiguration(classes = HelloWorldConfiguration.class)
  public class TestApp {
  
  
      @Test
      public void testBean() {
          HelloWorld helloWorld = context.getBean(HelloWorld.class);
  
          helloWorld.setMessage("I Love Dogs");
          Assert.assertEquals(helloWorld.getMessage(), "I Love Dogs");
      }
  }
  </code></pre>