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

## Discover tests
The `TestEngine` method `discover` is responsible for discovering tests.
- The first parameter of the `EngineDiscoveryRequest` type represents the requests to discover tests.
- The second parameter of type `UniqueId` should be used as the unique ID of the returned root, `TestDescriptor`.

An `EngineDiscoveryRequest` consists of selectors and `filters.Selectors` select resources to discover tests, while **filters** filter resources. **Selectors** should implement the `DiscoverySelector` interface, and filters should implement the DiscoveryFilter interface. The table below shows the methods of `EngineDiscoveryRequest`.

# Discover tests
The `TestEngine` method `discover` is responsible for discovering tests.
- The first parameter of the `EngineDiscoveryRequest` type represents the requests to discover tests.
- The second parameter of type `UniqueId` should be used as the unique ID of the returned root, `TestDescriptor`.

An `EngineDiscoveryRequest` consists of selectors and `filters.Selectors` select resources to discover tests, while **filters** filter resources. **Selectors** should implement the `DiscoverySelector` interface, and filters should implement the DiscoveryFilter interface. The table below shows the methods of `EngineDiscoveryRequest`.

Let's learn about the discover and execute tests 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

Discover and Execute Tests

Discover tests