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.

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.