Unit testing a Java Servlet

Question

I would like to know what would be the best way to do unit testing of a servlet.

Testing internal methods is not a problem as long as they don\'t refer to the servl

Answer 1

Are you calling the doPost and doGet methods manually in the unit tests? If so you can override the HttpServletRequest methods to provide mock objects.

myServlet.doGet(new HttpServletRequestWrapper() {
     public HttpSession getSession() {
         return mockSession;
     }

     ...
}

The HttpServletRequestWrapper is a convenience Java class. I suggest you to create a utility method in your unit tests to create the mock http requests:

public void testSomething() {
    myServlet.doGet(createMockRequest(), createMockResponse());
}

protected HttpServletRequest createMockRequest() {
   HttpServletRequest request = new HttpServletRequestWrapper() {
        //overrided methods   
   }
}

It's even better to put the mock creation methods in a base servlet superclass and make all servlets unit tests to extend it.