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Tag Archives: JUnit

Introduction in Java TDD – part 1

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Welcome to an introduction in Test Driven Development (TDD) series. We will talk about Java and JUnit in context of TDD, but these are just tools. The main aim of the article is to give you comprehensive understanding of TDD regardless of programming language and testing framework. If you don’t use TDD in your project you are either lazy or ...

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Test Doubles: mocks, dummies and stubs

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Most classes have collaborators. When unit testing, you usually want to avoid using real implementations of those collaborators to avoid test brittleness and binding/coupling, and instead use Test Doubles: Mocks, Stubs and Doubles. This article references two existing articles on the subject: Mocks Aren’t Stubs, by Martin Fowler and The Little Mocker, by “Uncle” Bob Martin. I recommend them both. Terminology I am going to ...

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Clean Integration Testing with JUnit Rules

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The benefits of JUnit Rules, especially when dealing with integration testing, can hardly be overrated. In this post, we’ll shine a light on the usefulness of ExternalResource extensions. These simplify fixture control in cases where we have to work with external-resource-abstracting third-party libraries. As an example, we’ll have a look at how to verify the correct retrieval of a list ...

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Parameterized integration tests with Spring JUnit Rules

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Spring 4.2 comes with brand new JUnit rules: SpringClassRule and SpringMethodRule. The main advantage of using JUnit rules is to let developers get rid of SpringJUnit4ClassRunner and utilize different JUnit runners in Spring integration tests. I think the biggest opportunity with Spring JUnit Rules is the ease of creating parameterized integration tests. The code to be tested For the purpose ...

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Adding Database Logging to JUnit3

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We have written many thousands of JUnit3 tests over the last decade and are now trying to consolidate the results in a database instead of scattered log files. It turns out to be remarkably easy to extend the TestCase class to do this. Note: this approach does not directly apply to JUnit4 or other test frameworks but it’s usually possible ...

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Using Junit Test Name

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Name your tests When we create Junit test usually there is no practical use of the name of the method. The Junit runner uses reflection to discover the test methods and since version 4 you are not restricted to start the name of the method with test anymore. The name of the test methods are there for documentation purpose. There ...

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JUnit: Testing Exceptions with Java 8 and AssertJ 3.0.0

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AssertJ 3.0.0 release for Java 8 makes testing exceptions much easier than before. In one of my previous blog post I described how to utilize plain Java 8 to achieve this, but with AssertJ 3.0.0 much of the code I created may be removed. Warning: this blog post contains mostly the code examples.     SUT – System Under Test ...

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Automated testing of REST-services

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Despite I’m a Java and Scala developer I still passioned a lot in testing of software. If to be more precisely – web applications. It’s really interesting to develop web app and be confident that the apps have a good quality. When I’ve started a career the most popular web architecture was MVC (Model View Control) and there was pretty ...

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Nifty JUnit : Using Rule on Method and Class level

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As shown in a the post Nifty JUnit : Working with temporary files, it is possible to use @Rule in a JUnit test, which is a Method level Rule. In this example I would like to show the variation of the @ClassRule for a Class level Rule. Method Rule The @Rule is fired before each test method (just like @Before) ...

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Using junit for something else

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junit != unit test Junit is the Java unit testing framework. We use it for unit testing usually, but many times we use it to execute integration tests as well. The major difference is that unit tests test individual units, while integration tests test how the different classes work together. This way integration tests cover longer execution chain. This means ...

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