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copied!<p>Can't say this is the best method to do so : but to unit test a simple servlet like that (one not using forwards, context etc..) what you could simply do is : </p> <ol> <li>Create mock HttpServletReqeust and HttpServletResponse instances using any mocking library. Even simpler would be using RequestWrapper and ResponseWrapper classes (simple custom classes implemented by extending the HttpServletReqeust and HttpServletResponse classes).</li> <li>On these mock (or custom) instances set certain properties - the parameters you want to test against in each test case - e.g. <code>op=add</code> for a addition unit test. If you are using custom classes, you can simply set them in an internal properties object. If you are using mocks, then settings expectations would do.</li> <li>Create an instance of the servlet - <code>new Calculator()</code>, keeping the required libs in the class path. Now call the <code>service</code> method on this instance.</li> <li>When the call returns, get the o/p from the response class and assert it. Since the response class is again a custom class or a mocked version, this should be easy.</li> </ol> <p>For mocking, a simply starting point would be EasyMock or Mockito (my fav) </p> <p>An example for the wrapper : <a href="http://tomcat.apache.org/tomcat-5.5-doc/servletapi/javax/servlet/http/HttpServletRequestWrapper.html" rel="nofollow">http://tomcat.apache.org/tomcat-5.5-doc/servletapi/javax/servlet/http/HttpServletRequestWrapper.html</a></p> <p>HTH</p>

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