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The Order of Tests in JUnit 1. Overview By default, JUnit runs tests using a deterministic, but unpredictable order (MethodSorters.DEFAULT). In most cases, that behavior is perfectly fine and acceptable; but there’re cases when we need to enforce a specific ordering. 2. Test Order in JUnit 5 In JUnit 5,… Continue Reading junit-5-test-order
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JUnit 5 for Kotlin Developers 1. Introduction The newly released JUnit 5 is the next version of the well-known testing framework for Java. This version includes a number of features that specifically target functionality introduced in Java 8 — it’s primarily built around the use of lambda expressions. In this… Continue Reading junit-5-kotlin
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The Basics of JUnit 5 – A Preview Testing JUnit JUnit 5 1. Overview JUnit is one of the most popular unit testing frameworks for Java, so it is a big deal in the developer community when new major versions come out. An alpha version of JUnit 5 was released… Continue Reading junit-5-preview
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Running JUnit Tests in Parallel with Maven 1. Introduction Although executing tests serially works just fine most of the times. Sometimes we may need to speed things up. In these situations, parallel tests can help. JUnit 4.7 and later versions make it possible to execute tests in parallel using Maven’s… Continue Reading maven-junit-parallel-tests
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A Guide to JUnit 5 Extensions 1. Overview In this article, we’re going to take a look at the extension model in the JUnit 5 testing library. As the name suggests, the purpose of Junit 5 extensions is to extend the behavior of test classes or methods, and these can… Continue Reading junit-5-extensions
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The Difference Between Failure and Error in JUnit 1. Introduction In this tutorial, we’ll explore the differences between a failure and an error in JUnit tests. In short, failures are unfulfilled assertions while errors are due to abnormal test execution. 2. Sample Code Let’s consider a very simplistic example, namely a… Continue Reading junit-failure-vs-error
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JUnit 5 Temporary Directory Support 1. Overview When testing, we often need access to a temporary file. However, managing the creation and deletion of these files ourselves can be cumbersome. In this quick tutorial, we’ll take a look at how JUnit 5 alleviates this by providing the TempDirectory extension. For… Continue Reading junit-5-temporary-directory
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@TestInstance Annotation in JUnit 5 1. Introduction Test classes often contain member variables referring to the system under test, mocks, or data resources used in the test. By default, both JUnit 4 and 5 create a new instance of the test class before running each test method. This provides a… Continue Reading junit-testinstance-annotation
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Skipping Tests with Maven 1. Introduction Skipping tests is often a bad idea. However, there are some situations where it could be useful — maybe when we’re developing new code and want to run intermediate builds in which the tests are not passing or compiling. In these kinds of situations… Continue Reading maven-skipping-tests
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Custom JUnit 4 Test Runners 1. Overview In this quick article, we’re going to focus on how to run JUnit tests using custom test runners. Simply put, in order to specify the custom runner, we’ll need to use the @RunWith annotation. 2. Preparation Let’s start by adding the standard JUnit… Continue Reading junit-4-custom-runners
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