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Unit testing with JUnit and DBUnit
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<dataset> <events id="1000" name="Test Event 1" start_date="2005-06-01"/> <events id="2000" name="Test Event 2" start_date="2005-07-01"/> <events id="3000" name="Test Event 3" start_date="2005-08-01"/> <dataset>
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The test data is stored in the TestEventDao.xml file and is loaded before your test runs. (You ll recall that the logic to load the file is in the ProjectTestCase class.) Once the test data is loaded, the test executes. If you have multiple tests in the test cases, the data is refreshed before each test. However, we ve only looked at a subset of DBUnit s functionality. You can also use DBUnit to verify the state of the database. Let s look at another test method:
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public void testPersists() throws Exception { HibernateFactory.buildSessionFactory(); Session session = HibernateFactory.openSession(); Transaction trans = session.beginTransaction(); Event event = new Event(); event.setName("Another test event."); Creates a table object that contains session.saveOrUpdate(event); data from the SQL trans.commit(); statement ITable table = getConnection().createQueryTable("events", "select * from events where name='Another test event.'"); assertEquals("Specified event not found.", 1, table.getRowCount()); Verifies that only one result was returned }
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The ITable class encapsulates the data retrieved by the SQL statement. You then use the ITable to ensure that only one row was retrieved from the events table. Why should you use DBUnit to verify the state of the database when you can do the same thing with Hibernate Our argument for using DBUnit to verify the state of the database is pretty simple. If you re testing your application code, which uses
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Hibernate, you shouldn t also use that code to verify the state of the database. Think of DBUnit as an impartial witness to the state of the database.
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If you want to make sure your code works correctly, test it. The best way to make sure your code works, and stays working, is to write automated unit tests that run every time you build your project. JUnit is even useful for testing databases and Hibernate. In this chapter, we covered how you can get and install JUnit. We also looked at how to write simple unit tests, which can be used to test your class s domain logic. Because testing databases isn t as easy as testing simple classes, Hibernate has some specific items you want to test. These include verifying that classes are persistent, that mapping files are correctly written, that entities cascade correctly, and that queries are returning the objects you expect. Finally, we discussed a few general tips for testing databases, including using multiple databases, avoiding brittle tests, and resetting the database to known states between tests. Much of the code we used was basic JUnit. The setup used in this chapter is effective but pretty simple, and you might want to be more elaborate. As a next step, for example, you can improve your unit tests by incorporating a more advanced developed database-testing framework, like DBUnit. DBUnit provides methods to prepopulate the database with test data, as well as clean up after tests have been completed. When you move these responsibilities to an external framework, your test code can focus more on testing functionality and less on plumbing. Additionally, DBUnit provides classes and methods to access the state of the database, providing independent verification of the state of the database.
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What s new in Hibernate 3
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This chapter covers
Filtering persistent objects Creating mapping files with annotations Persistent events
n Hibernate s short history, it has become one of the most popular persistence services for Java applications. When Hibernate 2 was released in June of 2003, it addressed most of the persistence problems developers commonly encounter. With the release of Hibernate 3 in March 2005, developers have a number of new features to take advantage of, such as filtering query results and utilizing stored procedures. One of the focuses of Hibernate 3 is improved support for legacy database schemas, as well as support for stored procedures and using custom SQL statements. Another feature introduced in the latest release is the ability to persist Maps just as you would a JavaBean. While the code examples in this book have included Hibernate 3 syntax when appropriate, this chapter gives you a more focused overview of many of the important new features found in Hibernate 3.
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