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    <p>Most of the time I test Servlets and JSP's via 'Integration Tests' rather than pure Unit Tests. There are a large number of add-ons for JUnit/TestNG available including:</p> <ul> <li><a href="http://httpunit.sourceforge.net/" rel="noreferrer">HttpUnit</a> (the oldest and best known, very low level which can be good or bad depending on your needs)</li> <li><a href="http://htmlunit.sourceforge.net/" rel="noreferrer">HtmlUnit</a> (higher level than HttpUnit, which is better for many projects)</li> <li><a href="http://jwebunit.sourceforge.net/" rel="noreferrer">JWebUnit</a> (sits on top of other testing tools and tries to simplify them - the one I prefer)</li> <li><a href="http://watij.com/" rel="noreferrer">WatiJ</a> and Selenium (use your browser to do the testing, which is more heavyweight but realistic)</li> </ul> <p>This is a JWebUnit test for a simple Order Processing Servlet which processes input from the form 'orderEntry.html'. It expects a customer id, a customer name and one or more order items:</p> <pre><code>public class OrdersPageTest { private static final String WEBSITE_URL = "http://localhost:8080/demo1"; @Before public void start() { webTester = new WebTester(); webTester.setTestingEngineKey(TestingEngineRegistry.TESTING_ENGINE_HTMLUNIT); webTester.getTestContext().setBaseUrl(WEBSITE_URL); } @Test public void sanity() throws Exception { webTester.beginAt("/orderEntry.html"); webTester.assertTitleEquals("Order Entry Form"); } @Test public void idIsRequired() throws Exception { webTester.beginAt("/orderEntry.html"); webTester.submit(); webTester.assertTextPresent("ID Missing!"); } @Test public void nameIsRequired() throws Exception { webTester.beginAt("/orderEntry.html"); webTester.setTextField("id","AB12"); webTester.submit(); webTester.assertTextPresent("Name Missing!"); } @Test public void validOrderSucceeds() throws Exception { webTester.beginAt("/orderEntry.html"); webTester.setTextField("id","AB12"); webTester.setTextField("name","Joe Bloggs"); //fill in order line one webTester.setTextField("lineOneItemNumber", "AA"); webTester.setTextField("lineOneQuantity", "12"); webTester.setTextField("lineOneUnitPrice", "3.4"); //fill in order line two webTester.setTextField("lineTwoItemNumber", "BB"); webTester.setTextField("lineTwoQuantity", "14"); webTester.setTextField("lineTwoUnitPrice", "5.6"); webTester.submit(); webTester.assertTextPresent("Total: 119.20"); } private WebTester webTester; } </code></pre>
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    1. USGarth Gilmour
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