Testing
JUnit 5 With Kotlin for Java Developers
This article explores writing JUnit 5 tests in Kotlin and configuring them with Gradle Kotlin DSL. It covers Kotlin-specific syntax for assertions, parameterized tests, dynamic and nested tests, lifecycle methods, and handling static fields. Readers will learn how Kotlin’s features can make test code more readable while fully supporting JUnit 5 functionality.
JUnit 5 Maven Example: Running Tests with Surefire
This guide demonstrates how to configure Maven for JUnit 5 testing, including adding dependencies and setting up the Surefire plugin. It covers both current Maven versions with native support and older versions requiring extra configuration. By following this example, you can run JUnit 5 tests seamlessly in your Maven projects.
JUnit 5 Gradle Example
This guide shows how to configure Gradle for JUnit 5, including adding dependencies and enabling the JUnit platform for running tests. It covers both modern Gradle versions with native support and older versions using the JUnit Gradle plugin. By the end, you’ll be able to run JUnit 5 tests successfully in your Gradle projects.
Migrating From JUnit 4 to JUnit 5: A Definitive Guide
Migrating from JUnit 4 to JUnit 5 involves updating dependencies, annotations, and testing classes while running old and new tests together. Custom runners and rules need to be replaced with extensions, and parameterized tests require rework to fit the new model. This guide provides step-by-step instructions for a smooth, gradual migration.
Testing Myth #2: Unit Tests Are Not Worth It
Many developers see unit tests as extra work, but their main purpose is improving design, not just finding bugs. Writing tests while coding encourages loose coupling, high cohesion, and produces a fast regression suite. Adding tests after the fact may require refactoring to gain real benefits.
Testing Myth #1: Writing Tests Slows You Down
Skipping tests might speed up short-term development, but it increases long-term maintenance costs and debugging time. Writing high-quality, feature-focused tests improves stability, catches errors early, and makes future changes easier and safer. Investing in tests upfront ultimately accelerates development over the software’s lifecycle.