Servlet Unit Testing

Required easyMock.jar file
download from http://www.easymock.org/Downloads.html

our servlet class
 NameServlet.java:
-------------------


import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class NameServlet extends HttpServlet
{
  private static final long serialVersionUID = 1L;

  @Override
  protected void doPost(HttpServletRequest req, HttpServletResponse res)
  throws ServletException, IOException
  {
    String firstName = req.getParameter("firstName");
    String lastName = req.getParameter("lastName");
   
    if (firstName != null) req.setAttribute("firstName", firstName);
    if (lastName != null) req.setAttribute("lastName", lastName);
   
 
  }
}

test class for above class

NameServletTest.java:
-----------------------

import static org.easymock.EasyMock.*;

import javax.servlet.http.HttpServletRequest;

import junit.framework.TestCase;
//other imports omitted

public class NameServletTest extends TestCase
{
    public void testWithMockObjects() throws Exception
    {
        // strict mock forces you to specify the correct order of method calls
        HttpServletRequest request = createStrictMock(HttpServletRequest.class);

        expect(request.getParameter("firstName")).andReturn("laxman");
        expect(request.getParameter("lastName")).andReturn("asman");

        request.setAttribute("firstName", "laxman");
        request.setAttribute("lastName", "asman");
       
       
       
        //unexpected method calls after this point will throw exceptions
        replay(request);
       
        new NameServlet().doPost(request, null);
       
        //check that the behaviour expected is actually
        verify(request);
    }
   
    //more test methods omitted ...
}