code:     public void testContextRoot_Bug53339() throws Exception {
          Tomcat tomcat = getTomcatInstance();
          tomcat.enableNaming();
  
          // No file system docBase required
          Context ctx = tomcat.addContext("", null);
  
          Tomcat.addServlet(ctx, "Bug53356", new Bug53356Servlet());
          ctx.addServletMapping("", "Bug53356");
  
          tomcat.start();
  
          ByteChunk body = getUrl("http://localhost:" + getPort());
  
          Assert.assertEquals("OK", body.toString());
      }
  
  