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The test then looks inside the body of the response, and finds the link with the ID happy. We could have used getLinkWith("happy test") instead, but this would have been more vulnerable to changes in the skin of the web page. Having found the link to the happy page, we fetch it. There is little need to examine the result, as in the setUp method we told HttpUnit to throw an exception on any error

manipulate data, the tables and columns involved must be specified at least three times (insert, update, select), adding to the time required for design and implementation. The distinct dialects for every SQL database management system don t improve the situation. To round out your understanding of object persistence, and before we approach possible solutions, we need to discuss application architecture and the role of a persistence layer in typical application design.

response code sent back by the web server. We check the title anyway, to verify we have fetched the correct file and that the link in the index page was correct. We also want to verify that our unhappy.jsp page is working correctly, that it returns a 500 error code when fetched. We use a separate test for this:

In a medium- or large-sized application, it usually makes sense to organize classes by concern. Persistence is one concern; others include presentation, workflow, and business logic.1 A typical object-oriented architecture includes layers of code that represent the concerns. It s normal and certainly best practice to group all classes and components responsible for persistence into a separate persistence layer in a layered system architecture. In this section, we first look at the layers of this type of architecture and why we use them. After that, we focus on the layer we re most interested in the persistence layer and some of the ways it can be implemented.

public void testUnhappy() throws Exception { assertNotNull("server.url not set",url); WebConversation session = new WebConversation(); WebRequest request = new GetMethodWebRequest(url+"/unhappy.jsp"); try { WebResponse response= session.getResponse(request); fail("should have raised an exception"); } catch(HttpException e) { assertEquals("Expected Internal Server Error 500", 500, e.getResponseCode()); } }

A layered architecture defines interfaces between code that implements the various concerns, allowing changes to be made to the way one concern is implemented without significant disruption to code in the other layers. Layering also determines the kinds of interlayer dependencies that occur. The rules are as follows:

Layers communicate from top to bottom. A layer is dependent only on the layer directly below it. Each layer is unaware of any other layers except for the layer just below it.

This test fetches the page and fails the test unless the attempt fails with a response code of 500. A successful fetch or an error code of any other value (such as a 404 not found response) constitutes a test failure. Together these tests can verify that our taglib works, that our web application deployed, and that our index page is as we intended it to be. This constitutes a good start at functional testing of the server, although we still have to write tests that verify the login process to protected pages, and to fill in the search form and get sensible responses back. HttpUnit lets you write these tests through its methods to examine tables and to examine and manipulate forms. All these are covered in the library s online documentation; we are going to focus on how to build and execute our tests in Ant. 12.6.2 Compiling the tests Being Java based, we have to compile the tests before we can run them. We save the tests in a test source subdirectory, which keeps them out of the normal compile and packaging targets. We add a simple <javac> in what is a new target in the web application build file, compile-tests. This is a normal compilation target, a new output directory (build/test/classes), and the following classpath:

Different systems group concerns differently, so they define different layers. A typical, proven, high-level application architecture uses three layers: one each for presentation, business logic, and persistence, as shown in figure 1.4. Let s take a closer look at the layers and elements in the diagram:

<path id="functional-test.compile.classpath"> <pathelement location="${httpunit.jar}"/> <pathelement location="${junit.jar}"/> <pathelement location="${jtidy.jar}"/> </path>

There are also the so-called cross-cutting concerns, which may be implemented generically by framework code, for example. Typical cross-cutting concerns include logging, authorization, and transaction demarcation.