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

So far, we’ve executed JUnit 5 tests using Maven. JUnit 5 has the `junit-platform-launcher` module to discover, filter, and execute tests. The JUnit platform can be launched using the `Launcher` API.

Methods of Launcher

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The `LauncherDiscoveryRequest` extends from `EngineDiscoveryRequest` and adds `EngineFilters` and `PostDiscoveryFilters`. An `EngineFilter` filters test engines. A `PostDiscoveryFilter` applies to `TestDescriptors` after test discovery. Launcher objects can be created using the `static method create()` of `LauncherFactory`. This 
`LauncherFactory` uses a Java service providers mechanism to look up test engines. The 
`LauncherDiscoveryRequest` can be created using `LauncherDiscoveryRequestBuilder`.
The code below shows how to use the `Launcher` API to discover and execute tests. We configure the `LauncherDiscoveryRequest` to select the `io.educative.junit5` package and filter resources using the class name pattern `.*Tests SummaryGeneratingListener`, which outputs execution results to the console.

Method	Description
`TestPlan` `discover(LauncherDiscoveryRequest` `launcherDiscoveryRequest)`	Discovers tests from the `LauncherDiscoveryRequest` and builds a `TestPlan`.
`void execute(LauncherDiscoveryRequest` `launcherDiscoveryRequest,` `TestExecutionListener... listeners)`	Executes a `TestPlan` built from the `LauncherDiscoveryRequest` and notifies `TestExecutionListeners`.
`void` `registerTestExecutionListeners(TestExecutionListener...` `listeners)`	Registers test execution listeners.

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

Launcher

Methods of Launcher