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

# Argument sources
The key aspect of parameterized tests is how to provide the arguments. JUnit 5 has some built-in sources of arguments. We can also use the extension model to create our own sources:
* `@ValueSource`
* `@EnumSource`
* `@MethodSource`
* `@CsvSource`
* `@ArgumentsSource`
# The `@ValueSource` argument
We already used `@ValueSource` in the previous lesson. It provides an array of literals of type `String`, `int`, `long`, or `double`, which can be specified using the strings, `ints`, `longs`, or `doubles` attributes, respectively.

Learn how to use the @ValueSource and @EnumSource arguments 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

@ValueSource and @EnumSource

Argument sources

The `@ValueSource` argument

Library Management System

@ValueSource and @EnumSource

Argument sources

The @ValueSource argument

The `@ValueSource` argument