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

# The `assertEquals()` method
The `assertEquals()` method asserts that two given values are equal. 
-  If the `actual` value is equal to the `expected` value, the test case passes.
- If the `actual` value isn’t equal to the `expected` value, the test case fails.



It has many overloaded methods for different primitive types and objects. For example, for the `int` primitive type, there are three different overloaded methods:

assertEquals(int expected, int actual)
assertEquals(int expected, int actual, String message)
assertEquals(int expected, int actual, Supplier messageSupplier)

- The `assertEquals(int expected, int actual)` method is the simplest form that accepts two `int` values for the check.
- The `assertEquals(int expected, int actual, String message)` method, when the two `int` values aren’t equal, fails with the given message.
- The `assertEquals(int expected, int actual, Supplier<String> messageSupplier)` method uses the `messageSupplier` to retrieve the failure message.

The `assertEquals()` method has the same overloaded methods for the `short`, `byte`, `long`, `char`, `float`, `double`, and `Object` primitive types. For `float` and `double`, there are three more overloaded methods that take another `delta` value for an equality check. When the difference of the two values is within the given `delta`, they’re considered equal. Below are the three methods for `float`.

Learn about the assertEquals() and assertNotEquals() 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

Assertions: assertEquals() and assertNotEquals()

The `assertEquals()` method

Library Management System

Assertions: assertEquals() and assertNotEquals()

The assertEquals() method

The `assertEquals()` method