Unit testing a Servlet managed by Spring

TestServlet.java

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration()
public class TestServlet {
    private HttpServlet servlet;
    @Resource
    protected ApplicationContext applicationContext;

    @Before
    public void initServlet() throws Exception {
        StaticWebApplicationContext webContext = new StaticWebApplicationContext();
        webContext.setParent(applicationContext);
        MockServletContext servletContext = new MockServletContext();
        servletContext.setAttribute(WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE, webContext);
        MockServletConfig servletConfig = new MockServletConfig(servletContext);

        this.servlet = new MyServlet();
        this.servlet.init(servletConfig);
    }

    @Test
    public void testRequest() throws Exception {
        MockHttpServletResponse response = new MockHttpServletResponse();
        this.servlet.doPost(new MockHttpServletRequest(), response);
        Assert.assertNotNull(response.getContentAsString());
    }
}