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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

In previous chapters, we focused on the new programming model in JUnit 5, that is, JUnit Jupiter. In this chapter, we’ll discuss the JUnit platform. The JUnit Jupiter and JUnit Vintage platforms are both built on top of this common platform.
## The `TestEngine`
A test engine is responsible for discovering and executing tests for a particular programming model. For example, JUnit Jupiter’s `TestEngine` discovers and executes tests written using the JUnit Jupiter programming model. Third parties can also provide custom implementations of test engines. Test engines are described using the `org.junit.platform.engine.TestEngine` interface. The table below shows the methods of `TestEngine`.

In previous chapters, we focused on the new programming model in JUnit 5, that is, JUnit Jupiter. In this chapter, we’ll discuss the JUnit platform. The JUnit Jupiter and JUnit Vintage platforms are both built on top of this common platform.
# The `TestEngine`
A test engine is responsible for discovering and executing tests for a particular programming model. For example, JUnit Jupiter’s `TestEngine` discovers and executes tests written using the JUnit Jupiter programming model. Third parties can also provide custom implementations of test engines. Test engines are described using the `org.junit.platform.engine.TestEngine` interface. The table below shows the methods of `TestEngine`.

Learn about the TestEngine in the JUnit 5 platform.

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

TestEngine in JUnit 5

The `TestEngine`