Gain insights into configuring and utilizing JUnit 5 for Java unit testing. Learn about writing effective unit tests, integrating assertions, assumptions, parameterized tests, and their significance.

Junit 5 is the most popular and widely used Java unit testing framework. In this course, you will learn step by step, how to configure and use JUnit 5 testing framework. This course will teach you how to write unit tests with JUnit 5, covering topics like why unit tests are important, the structure of good unit tests, assertions, assumptions and parameterized tests and more.

Java Unit Testing with JUnit 5

# fail() method ###

Assertions API provide static `fail()` method. As soon as, any `@Test` method encounters `fail()` static method, it will fail the test case. The primary usages of `fail()` method are as follows - 

- It gives a piece of meaningful information to the programmer writing a test, that test case is in progress and still needs to be implemented.
- It can be used to verify that an actual exception is thrown. Usually based on some input when test case expects an exception at a certain line, providing `fail()` below that line will verify that exception was not thrown as code execution reached `fail()` method line. Thus, it explicitly fails the test case. 


There are basically five useful overloaded methods to fail:-

This lesson demonstrates the importance of the fail method in JUnit 5 Assertions API.

Getting Started

Assertions in Junit 5

Junit 5 Test Lifecycle Callbacks

Display Names

Dependency Injection for Constructors and Methods

Assumptions in Junit 5

Disable or Enable Tests in Junit 5

Nested Tests in Junit 5

JUnit 5 Integration with Maven

Parameterized Tests in Junit 5

Repeated Tests in Junit 5

Appendix

fail() method

fail() method