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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

There are two types of dynamic tests:
- Simple `DynamicTest`
- Nested `DynamicTest` 
## Simple `DynamicTest`
All test cases we’ve created so far are static. They’re defined at #key# compile-time: A time period when the programming code is converted to the machine code. #key# and can’t be changed at runtime.  In JUnit 5, we can create dynamic tests that are generated at #key# runtime: A time period when a program is running. #key# by #key# **factory** methods: It is a method that solves the problem of creating product objects without specifying their concrete classes. #key#. These methods are annotated with the `org.junit.jupiter.api.TestFactory` annotation.

The method annotated with `@TestFactory` must return a `Stream`, `Collection`, `Iterable`, or `Iterator` of `org.junit.jupiter.api.DynamicNode` objects. The `DynamicNode` is abstract. It has two subclasses:

- The `org.junit.jupiter.api.DynamicContainer` subclass is the container of other DynamicNode objects.
- The `org.junit.jupiter.api.DynamicTest` subclass is a generated test case.

 

There are two types of dynamic tests:
- Simple `DynamicTest`
- Nested `DynamicTest` 
# Simple `DynamicTest`
All test cases we’ve created so far are static. They’re defined at #key# compile-time: A time period when the programming code is converted to the machine code. #key# and can’t be changed at runtime.  In JUnit 5, we can create dynamic tests that are generated at #key# runtime: A time period when a program is running. #key# by #key# **factory** methods: It is a method that solves the problem of creating product objects without specifying their concrete classes. #key#. These methods are annotated with the `org.junit.jupiter.api.TestFactory` annotation.

The method annotated with `@TestFactory` must return a `Stream`, `Collection`, `Iterable`, or `Iterator` of `org.junit.jupiter.api.DynamicNode` objects. The `DynamicNode` is abstract. It has two subclasses:

- The `org.junit.jupiter.api.DynamicContainer` subclass is the container of other DynamicNode objects.
- The `org.junit.jupiter.api.DynamicTest` subclass is a generated test case.

 

Let's learn how to dynamically test simple and nested methods 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

Types of DynamicTest

Simple `DynamicTest`