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All this might make it sound as if your e-commerce business can t possibly fail. Well, it s time to take a cold shower and realize that even the best-laid plans often go wrong. Some risks are particularly relevant to e-commerce companies, such as Hacking Credit card scams Hardware failures Unreliable shipping services Software errors Changing laws You can t get rid of these risks, but you can try to understand them and defend yourself from them. The software developed in this book goes some way to meeting these issues, but many of the risks have little to do with the site itself. An important way to defend your site from many risks is to maintain backups. You already know backups are important. But if you re anything like me, when it gets to the end of the day, saving five minutes and going home earlier seems even more important. When you have a live web site, this simply isn t an option. We haven t talked much about the legal side of e-commerce in this book because we are programmers, not lawyers. However if you are setting up an e-commerce site that goes much beyond an online garage sale, you ll need to look into these issues before putting your business online.

The framework includes extendable classes used to create tests and test runners that run the tests and present the results The junitframework package contains the interface and classes used to develop unit tests The Test interface is a simple interface used to define a test Rather than implement the Test interface directly, most users extend the abstract base class junitframeworkTestCase or the concrete class junitframeworkTestSuite A TestCase contains the tests for a single unit, while a TestSuite is a collection of Test classes In Java, a unit is a class Therefore, a TestCase typically contains all the tests for a single class A test tests a single method of a class or a single unit of work Tests have one of three outcomes: pass, fail, or error If a test passes, the method or unit of work implements all the functionality as expected.

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Listing 4 9. Making an HTTP request void WorkerThread::fetch(const QString& url) { QNetworkReply *reply = mNetManager->get(QNetworkRequest(QUrl(url))); if (!reply) { emit error(tr("Could not contact the server")); } }

4. Execute the query by selecting Query Execute, or by pressing F5. The results can be seen in Figure 4-6.

Figure 4-6. Adding sample categories 5. Now, try to break the database integrity by adding a category to a nonexistent department (for example, set the DepartmentID to 500). Try executing this SQL command using pgAdmin III: INSERT INTO category (department_id, name, description) VALUES (500, 'New category', 'Executing this command should throw an error.'); 6. If everything goes well, the database should deny adding the new record, throwing this error you can see in Figure 4-7.

A failure occurs when an expected value doesn t equal an actual value For example, a test might be written to check that the size is incremented when an object is added to a collection Assertions are used to compare the actual value to the expected value Uncaught Exceptions are the cause of errors A test runner can be used to execute a TestCase and report the results There are many test runners available To define a test, extend the junitframeworkTestCase class and add the appropriate test methods similar to those shown in Listing 8-2 A test is a method with no return value, no parameter, and the name testXXXX In the test method, the Assert class static methods are used to determine if actual result values of a test equal the expected values The Assert class contains many static assert methods.

It s worth noting that the QNetworkAccessManager s get method does not block; control returns to the main thread, and the manager performs the network request asynchronously. In fact, the real reason to encapsulate this part of the application in its own thread is the XML parsing, which can take a bit of time in a large document. When the network operation completes, the manager will emit the finished signal, which we handle in handleNetFinished (Listing 4 10).

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