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Unit testing with JUnit and DBUnit
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This chapter covers
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Learning to write tests with JUnit Using JUnit to test Hibernate Applying DBUnit to reset database state
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hen the coding is done, how do you know your program is working as you intended Generally, the answer is testing. Writing code is only half the battle; you need to verify that the code is doing what you think it should. There are many types of testing, often done by members of your staff. You may have acceptance testing done by the Quality Assurance department on behalf of the customer, or integration testing defined by your architect or development lead to make sure all the parts of the system are working together. But the bedrock beneath all the higher-level tests is the unit test. Developers unit-test their code by making sure the small bits of code (usually methods or classes) work in isolation. Unit tests can be carried out either manually or automatically. Manual testing is merely acceptable, allowing a developer to spot-check that one or two methods are working correctly. In Java it usually results in a lot of System.out.println() statements or clicking around on a GUI. This
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Unit testing with JUnit and DBUnit
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approach has the benefit of requiring little investment, but is labor intensive and doesn t catch bugs in parts of the system that aren t being actively tested. Automatic testing, on the other hand, takes a bit of work up front, but once you write your tests, you have a suite that can be frequently and automatically run, assuring that bugs stay fixed. This chapter is all about writing the automatic tests for your Hibernate projects. We introduce an open source framework, JUnit, which is the de facto standard for writing unit tests in Java. Unit testing is easy for simple cases, but testing persistence layers, like Hibernate, is more complex. This chapter aims to make that easier.
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By the end of the chapter, you should be able to do the following:
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Understand why unit testing is important. Know to how to get and install JUnit. Create a basic test with JUnit. Set up your environment and write tests for your Hibernate layer. Use DBUnit to set up and tear down a database for testing.
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Assumptions
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Since this chapter covers how to test Hibernate, we expect you to understand the basics of Hibernate. In addition, while we ll cover some basic tenets of how to write unit tests, you should have some understanding of how to do testing, either manually or automatically. We ll build on this basic knowledge to explain how Hibernate should be tested.
Since this chapter covers how to test Hibernate, we expect you to understand the basics of Hibernate. In addition, while we ll cover some basic tenets of how to write unit tests, you should have some understanding of how to do testing, either manually or automatically. We ll build on this basic knowledge to explain how Hibernate should be tested.
10.1 Introduction to unit testing
The core philosophy behind automated unit testing is that you should test everything that could possibly break. As you build your program, you write unit tests in the same code in which you re writing the
Introduction to unit testing
program. Method by method, class by class, verify that everything works as it should, and when you re done, you have a suite of tests for the life of your program that can be used to make sure it stays working.
10.1.1 Automate those tests
Unlike with visual inspections, you don t manually evaluate what each method is doing every time you test it. Instead, you write code that exercises and verifies that your methods do exactly what you think they should. Using a framework like JUnit facilitates this by providing a support structure to collect and run all the tests together. To write some tests, you need to have a class to test. In this chapter, let s start with the basic Event we have seen in previous chapters. We ll add a method to it, isScheduledBefore(), which determines whether the event is scheduled to start before a given date. This is the type of method you might often see on a domain object, because it encapsulates logic about the domain object where it belongs, inside Event. The method looks like this:
/** * Determines if this event is scheduled before the given date. * @param date - The date to compare against. * @return true - if the event.startDate is prior to the given date. */ public boolean isScheduledBefore(Date date) { return this.startDate.getTime() < date.getTime(); }
This is a fairly simple method, but there could easily be a bug in it, for example, if you used a > instead of a <. It s worth writing a unit test to verify that the method works as expected, and stays working if you later need to modify it. So let s write a sample unit test.
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