Unit Testing a Dispatcher Servlet with a Custom Context Class in Pivotal Greenplum

Products

• VMware Tanzu Greenplum

Issue/Introduction

Unit testing a dispatcher servlet is essential in building a web application.
 

This article provides information on how to check the functionality of your custom context class and the life cycle of a dispatcher servlet without having to run the entire application.

Environment

Resolution

To unit test a dispatcher servlet in Spring Framework 3.0, you must write a Test Class extending TestCase just like any other JUnit Test. Create a MockServletConfig to set your own context class.
 

The sample provided below allows you to check for a controller inside a custom WebApplicationContext.
 

Note: Servlet-api-2.5.jar and spring-test 3.0.3 was used in this testing:

public class DispatcherServletTest extends TestCase {

  DispatcherServlet dispatcherServlet;

   protected void setUp() throws Exception{

     dispatcherServlet = new DispatcherServlet();

       MockServletConfig servletConfig = new MockServletConfig(new MockServletContext(), "ServletName");
       dispatcherServlet.setContextClass(MyXmlWebApplicationContext.class);
       dispatcherServlet.init(servletConfig);

	}

   public void testControllerInContext() throws Exception{

       MockHttpServletRequest request = new MockHttpServletRequest(dispatcherServlet.getServletContext(), "GET", "/validrequest.do");
       MockHttpServletResponse response = new MockHttpServletResponse();
       dispatcherServlet.service(request, response);
       assertEquals(HttpServletResponse.SC_OK, response.getStatus());
       dispatcherServlet.destroy();
	}
    }