Mockito - A Simple Servlet Tester

servletTester.java

/**
 *  this work's fine on mockito 1.9.5
 */ 
@Test
public void testServlet() throws Exception {
    HttpServletRequest request = mock(HttpServletRequest.class);       
    HttpServletResponse response = mock(HttpServletResponse.class);    

    when(request.getParameter("username")).thenReturn("me");
    when(request.getParameter("password")).thenReturn("secret");

    PrintWriter writer = new PrintWriter("somefile.txt");
    when(response.getWriter()).thenReturn(writer);

    new MyServlet().doPost(request, response);
    verify(request, atLeast(1)).getParameter("username"); // only if you want to verify username was called...
    writer.flush(); // it may not have been flushed yet...
    assertTrue(FileUtils.readFileToString(new File("somefile.txt"), "UTF-8").contains("My Expected String"));
}

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Older Version

download mockito-all-1.9.5.jar on google code