Gain insights into JUnit 5, explore its advantages over JUnit 4, and delve into its features like assertions, parameterized tests, dependency injection, and test execution order. Discover hands-on projects to cement your skills.

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JUnit 5 is a standard framework for unit testing in Java. Released in 2017, JUnit 5 is a major improvement over JUnit 4 and supports a lot of new methods. Many projects have migrated from JUnit 4 to JUnit 5. JUnit 5 is also the default test framework for new projects. JUnit 5 is composed of three sub-projects: JUnit Platform, JUnit Jupiter, and JUnit Vintage. Details of these sub-projects are discussed in the course.

This course first discusses the advantages of JUnit 5 over the previous versions and then jumps directly into tests. The course includes discussion on assertions, assumptions, tagging and filtering, nested tests, dependency injection, repeated tests, parameterized tests, dynamic tests, test instance lifecycle, extension model, JUnit 4 migration, JUnit platform, and test execution order. 

By the end of this course, you’ll be deeply familiar with unit testing in JUnit 5. There’s also a little project for you at the end to put your newly acquired skills to the test.

All About JUnit5

# Multiple annotations
We discussed the `@Disabled` annotation to disable test classes or methods. It’s actually implemented as a built-in extension of `ExecutionCondition`. This `ExecutionCondition` can be evaluated before the execution of each test class or test method to determine if the test class or method should be executed. It has only one method, `ConditionEvaluationResult evaluateExecutionCondition(ExtensionContext context)`, at **line 10** in the code below.

The return value of type `ConditionEvaluationResult` contains a boolean value to indicate if the test is disabled and an optional message about the reason to enable or disable it. The `ConditionEvaluationResult` objects are usually created using `static methods enabled(String reason)` and are disabled (`String` reason). The implementation of the `@Disabled` annotation is the `org.junit.jupiter.engine.extension.DisabledCondition` class, which checks for the existence of `@Disabled`.



Let's learn how to test execution conditions in JUnit 5.

Getting Started

Writing Basic Tests

Annotations, Tagging, and Filtering

Nested tests in JUnit 5

Dependency Injections

Parameterized and Dynamic Tests

Test Instance Lifecycle in JUnit 5

Extension Model

JUnit Platform

Test Execution Order

Conclusion

Library Management System

Test Execution Conditions

Multiple annotations