[![][Logo]][GitHub Repository]

This repository contains the code examples of [JUnit 5] for the book [Mastering Software Testing with JUnit 5: Comprehensive guide to develop high quality Java applications], authored by [Boni García] and published by [Packt]. [![][Cover]][Packt] These examples cover the main features of JUnit 5, such as:

• JUnit 5 tests lifecycle.

• Assertions.

• Tagging and filtering tests.

• Conditional test execution.

• Nested and repeated tests.

• Migration from JUnit 4.

• Dependency injection.

• Dynamic tests.

• Test interfaces.

• Test templates.

• Parameterized tests.

• Parallel execution.

• Ordered tests.

Moreover, the integration with third-party technologies is also illustrated with examples, concretely:

• Mockito (popular mock framework).

• Spring (Java framework aimed to created enterprise applications based on dependency injection).

• Docker (container platform technology).

• Selenium WebDriver (test automation library for web applications).

• Appium (test automation library for mobile devices).

• Android (open source mobile operating system based on Linux).

• REST services (using REST Assured, Retrofit2, or WireMock).

JUnit 5 versions

This repository has different tags, one per minor version of JUnit 5. Currently, the available tags are the following:

• 5.0: Examples using JUnit 5.0.3. The examples of the book [Mastering Software Testing with JUnit 5] are based on this version.

• 5.1: Examples using JUnit 5.1.1.

• 5.2: Examples using JUnit 5.2.0.

• 5.3: Examples using JUnit 5.3.2.

• 5.4: Examples using JUnit 5.4.2.

• 5.5: Examples using JUnit 5.5.2.

• 5.6: Examples using JUnit 5.6.3.

• 5.7: Examples using JUnit 5.7.2.

• 5.8: Examples using JUnit 5.8.2.

• 5.9: Examples using JUnit 5.9.3.

• 5.10: Examples using JUnit 5.10.0.

• 5.11: Examples using JUnit 5.11.0.

• 5.12: Examples using JUnit 5.12.0.

Complete example

The project [Rate my cat!] contains a sample web application based on Spring Boot (Spring MVC, Thymeleaf, and Spring Data JPA) with a complete set of JUnit 5 tests (unit with Mockito, integration with Spring, and end-to-end tests with Selenium).

About

Mastering JUnit 5 (Copyright © 2017-2025) is a project created and maintained by [Boni García] and licensed under the terms of the [Apache 2.0 License]. [JUnit 5]: https://junit.org/junit5/ [Boni García]: https://bonigarcia.dev/ [Logo]: https://bonigarcia.github.io/img/masteringjunit5logo.png [GitHub Repository]: https://github.com/bonigarcia/mastering-junit5 [Mastering Software Testing with JUnit 5: Comprehensive guide to develop high quality Java applications]: https://www.amazon.com/Mastering-Software-Testing-JUnit-Comprehensive-ebook/dp/B076ZQCK5Q [Packt]: https://www.packtpub.com/product/mastering-software-testing-with-junit-5/9781787285736 [Rate my cat!]: https://github.com/bonigarcia/rate-my-cat [Cover]: https://bonigarcia.dev/img/mastering-software-testing-with-junit-5.png [Apache 2.0 License]: https://www.apache.org/licenses/LICENSE-2.0