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Lesson 5 - Java testing - Unit tests of real applications II

In the previous lesson, Java Testing - Unit Tests of Real Applications I, we discussed unit tests for a class parsing hashtags from string messages. In today's lesson, we're going to look at another practical demonstration of unit tests in Java, again from a real application. This time we'll learn to test the persistent layer, i.e. whether the saving and loading of objects works. We can stick with the application with messages and hashtags.

The Testing Environment

The application's database layer is typically larger and includes at least a few managers and entity classes. Creating test data in every test, as we did with TagAnalyzerTest, would be a lot of unnecessary work. So we'll use a little trick and create a static TestEnvironment class that will provide us with test data for our next tests.


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Article description

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We'll analyze the source code of a unit test from a real Java app storing data in a database. We'll test the persistence layer using test data.

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Article has been written for you by David Capka Hartinger
The author is a programmer, who likes web technologies and being the lead/chief article writer at He shares his knowledge with the community and is always looking to improve. He believes that anyone can do what they set their mind to.
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