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While there s not much to it (all it does is test that true is, in fact, true), this test gives you a template from which to build your real tests. It has the following elements: The test class is a subclass of Ruby s built-in testing framework, Test::Unit. The fixtures class method makes available the given fixtures. In this case, we re loading the events fixture, providing access to the test data in test/fixtures/ events.yml. Tests are implemented as methods prefixed with test_. Within a test case, assertions are used to test expectations. We ll explain how these work in the Testing with Assertions section coming up shortly. If you peek inside the test/unit directory, you ll see a similar test case for every model we ve generated so far: Event, EventMailer, User, and Registration. Each looks almost exactly the same as the Event test. Let s run the unit tests now and see what happens.

A relationship can be used to enforce data integrity. In other words, if you are expecting data in one table because there is data in another, you can place a relationship between these two tables to ensure that no SQL command breaks this rule. However, don t confuse referential integrity with other processes that are associated with maintaining data integrity, such as placing checks or default values on columns to ensure that values for a specific column are valid. Referential integrity revolves around the idea that there are two tables in the database that contain the same information, and it requires that the duplicated data elements are kept consistent. For example, if you have a primary key in one table and a foreign key in another table and both have

Loaded suite /usr/local/lib/ruby/gems/1.8/gems/rake0.7.2/lib/rake/rake_test_loader Started .... Finished in 0.053392 seconds. 4 tests, 4 assertions, 0 failures, 0 errors

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In this chapter, you looked at how to bind lists of data to Silverlight controls. Then you focused on two controls typically bound to data: the DataGrid control and the ListBox control. You saw how these controls are flexible and can show data in unique ways. However, in all of these examples, the classes contained static data. In real-world examples, the data that you will normally list in a DataGrid or ListBox will be coming from some external data source, such as an XML file or a web service. In the next chapter, you will look at how to get data from these external data sources and how to use that data to bind to your Silverlight applications.

At this point, we have now created a backup and performed a restore of the example database. We have also covered the different methods to back up and restore the database. However, we have no real plan for regular maintenance and detection and reporting of problems in our database strategy. Any jobs for backup of the database or transaction log that we have demonstrated so far are held as single units of work called steps. Not only that, there is nothing in place that will look after the data and indexes held within the database to ensure that they are still functioning correctly and that the data is still stored in the optimal fashion. Without a process that runs regularly, we would need to perform all of this by hand regularly and check the results each time. What a waste of time, and boring to boot! This section will demonstrate building a plan and then checking on the plan after it has run to ensure that all has gone well with it. This plan will perform regular backups and checks on the database and keep it in optimum health. This section will then show you how to set up the ability to e-mail results. To do this, we will use the Database Maintenance Wizard, which will monitor corruption within the database, optimize how the data is stored, and back up both the database and transaction logs. Finally, the wizard will schedule all of this to occur at regular intervals. You will also see how to set up and configure SQL Server Database Mail. Some areas of this chapter, like the backup screens, are straightforward, as they were covered earlier in the chapter; however, this now brings the whole maintenance of the database into one wizard.

Take a closer look at the output. If a test case passes, as each did this time, you ll see a . (dot) character. When the test case produces an error, you ll see an E. If any assertion fails to return true, you ll see an F. Finally, when the test suite is finished, it prints a summary.

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