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Tag Archives: JUnit

JUnit 5 – Architecture

Now that we know how to set JUnit 5 up and write some tests with it, let’s take a look under the covers. In this post we’ll discuss the JUnit 5 architecture and the reasons why it turned out this way. Overview This post is part of a series about JUnit 5: Setup Basics Architecture Conditions Injection … JUnit 4 ...

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How to Replace Rules in JUnit 5

The recently published JUnit 5 (aka JUnit Lambda) alpha release caught my interest and while skimming through the documentation I noticed that rules are gone – as well as runners and class rules. According to the documentation, these partially competing concepts have been replaced by a single consistent extension model. Over the years, Frank and I wrote several rules to ...

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Improve Your JUnit Experience with this Annotation

JUnit is probably part of 90% of all Java projects. And the exciting thing is, we’ll soon have JUnit 5 with Java 8 support. We’ve blogged about an improvement recently. Back in JUnit 4 land, there’s this little trick that I can only recommend you put in all of your unit tests. Just add this little annotation here and you’ll ...

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JUnit 5 – Basics

Last week we’ve set up JUnit 5 to be able to write tests. So let’s do it! Overview This post is part of a series about JUnit 5: Setup Basics Architecture Conditions Injection … Most of what you will read here and more can be found in the emerging JUnit 5 user guide. Note that it is based on an ...

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JUnit 5 – Setup

In November 2015 the JUnit Lambda team presented their prototype. Since then the project rebranded itself as JUnit 5 and released an alpha version in February 2016. We’ll explore it in a series of short posts: Setup Basics Architecture Conditions Injection … This one discusses the JUnit 5 setup so you can write code against the new API and run ...

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Use JUnit’s expected exceptions sparingly

Sometimes, when we get pull requests for jOOQ or our other libraries, people change the code in our unit tests to be more “idiomatic JUnit”. In particular, this means that they tend to change this (admittedly not so pretty code): @Test public void testValueOfIntInvalid() { try { ubyte((UByte.MIN_VALUE) - 1); fail(); } catch (NumberFormatException e) {} try { ubyte((UByte.MAX_VALUE) + ...

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Introduction in Java TDD – part 1

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

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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