Top 5 JUnit, Mockito, and Test Driven Development Courses for Java Programmers in 2021 - Best of Lot

Hello guys, if you want to learn Unit testing in Java and tools like JUnit, Mockito for test-driven development and looking for the best online Java testing courses, then you have come to the right place. Earlier, I have shared the best Java Programming courses, and today, we'll talk about JUnit and Unit testing, one of the critical skills for any Software developer. You may already know that JUnit and Mockito are two of the most popular testing libraries for Java applications, and you will find them in almost every Java application classpath. I often meet and work with Java developers who know Java well but haven't written a single unit test. 

When I ask them why they don't write unit tests, they come up with many excuses like they don't have time for writing unit tests, there is always deadline pressure, and some of the honest guys will tell you that they tried writing but give up after 10-15 minutes due to difficulty in testing their code.

Whatever your reason for not writing a unit test, I don't think it's going to work anymore because in today's world of DevOps and Automation, there is increased focus on code reviews, unit testing, and integration testing, and you just can't get away by not writing tests.

In fact, every good software developer must know how to write unit tests, and nearly all Java jobs ask for unit testing skills, and those who don't mention it assume that you already know unit testing.

Unit tests are at the lowest level and typically checks a single method to confirm that they return the correct result. Example the toCelcius()).  Don't worry if you haven't written any unit tests; as long as you can accept the fact and are willing to learn unit testing in Java using JUnit and Mockito, you are in good shape.

In the past, I have shared some great books to learn unit testing in Java, and today, I am going to share some of the online courses you can use to learn JUnit 5 or Jupiter, the latest version of the JUnit library, and Mockito to write a unit test for your Java application.

You can use these online courses to get up-to-speed with JUnit and Mockito. This will help you in your current job and project and increase your chances of getting a job with better pay; believe me, everyone loves a good software developer, and there is always a demand for a programmer who can code and write good tests.





What is Unit Testing? Why Java Programmers should write tests?

If you are thinking, why should I write unit tests? Shouldn't I get paid for writing code to add functionality? Then let me tell you that Unit tests are necessary on every excellent software, and every programmer should write a Unit test.

It increases confidence during development and helps you write cleaner, more reusable code, and also helps you to catch bugs earlier. Catching mistakes in the development phase is a lot less costly than finding them in production. It not only will save you from embarrassment but also your company and user from frustration.

Talking about Unit testing, Unit tests are typically written by Software developers when they develop new features and not by software testers. If you are convinced and want to learn unit testing in Java, you can explore these online courses to learn unit testing in Java.


5 Best Online Courses to learn JUnit 5, Mockito, and Test Driven Development  in 2021

JUnit is the defacto standard for unit testing in the Java world, but you often need Mockito. This mocking framework is often used along with JUnit to make unit testing earlier.

I have been using JUnit since JUnit 3 was there, which was before annotations. Then JUnit 4 came in 2006, and after 11 years of a long wait, JUnit 5 arrived in September 2017.

As of writing, this is the latest version of JUnit, and every Java developer should learn it. Even though you still find many projects using JUnit 4, learning JUnit 5 will help you write a better test and faster by leveraging new features.

Most of these course covers JUnit 5, but I have also included a lesson on test-driven development to learn some best practices and techniques for writing better unit tests.


1. Practical Java Unit Testing with JUnit 5 [Udemy Best Course]

This is one of the best courses to learn how to write Java unit tests with JUnit 5 or Jupyter. This course is ideal for all kinds of Java developers, from intermediate Java developers with years of experience to beginners who have not written a single unit test before.

The course is full of practical examples, additional exercises, a unit testing cheat sheet. It starts from scratch, telling you about a unit test and why you should do it before teaching you how to do it step by step.

The course also teaches you unit testing best practices and their sample project; the HealthyCoder example makes exciting things. The course is filled with exercises and an extra JUnit cheat sheet and provides enough knowledge to a Java developer to start writing unit tests on their own.

On top of all of this, instructor Adrian Więch has an excellent voice, just perfect for teaching, and his voice modulation, pace, and skill to simplify things make this course very interesting. I strongly recommend this course to all Java developer who wants to learn Unit testing this year.

Top 5 JUnit and Unit Testing Courses for Java Programmers




2. Learn Unit Testing with JUnit & Mockito in 30 Steps [Udemy Top Course]

This is another great course to learn Mockito and JUnit - the most popular unit testing and mocking frameworks in Java worlds - with 25 Examples.

I am a big fan of Ranga and his in28Minutes courses as they focus on 20% of important stuff, which is used 80% of the time. Having seen his Spring Masterclass and Microservice course, I know that this will also be the good one, and it didn't disappoint me.

The course takes a step-by-step approach and, in 30 steps, will teach you enough Mockito and JUnit so that you can write your own tests. The first 18 steps are about Mockito, and the last 12 are of JUnit.

The course covers basic stuff like writing simple tests and more advanced concepts like testing static methods, Organize JUnit tests into Suites, Parameterized Tests, Testing Exceptions in JUnit Tests, and in general, how to write better tests.

Overall, a good, hands-on, and short course to learn Mockito and JUnit in less than 4.5 hours.

best Java testing and JUnit course Udemy





3. Java Unit Testing with JUnit 5 [Educative Best Course]

I recently came across this new online platform for learning called Educative. It's a bit different from Udemy and Pluralsight because it's interactive and allows you to run code right from the web page, making it very effective.

Like the previous two courses, this course will also teach you to write unit tests with JUnit 5. It also covers topics like why unit tests are essential, and the structure of good unit tests, assertions, assumptions, etc. parameterized tests, and more.

If you like interactive learning, you can check out this course; it comes with 3 Free previous lessons and a 30-day return policy, which is good enough to give it a go. 

And, if you find the Educative platform and their coding interviews courses like Grokking the System Design Interview, consider getting an Educative Subscription that provides access to their 150+ courses for just $14.90 per month. It's very cost-effective and great for preparing for coding interviews. 

best Java testing course Educative




4. Practical Test-Driven Development for Java Programmers [Udemy Best Course]

Learning JUnit is one thing, and writing unit tests is another. It's easy to write a trivial unit test for the sample project, but when you go into an actual project where TDD has not been used, and no unit test is writing, you will find many challenges writing your first test; this course helps there.

I have purposefully included this course because I believe learning TDD and Unit testing, in general, is as essential as learning JUnit and Mockito.

The instructor Matt Greencroft is very experienced and will teach you how to write unit tests for trickier scenarios and show you TDD techniques to fix applications that weren't developed using TDD.

My favorite part of this course is Chapter 10, handling legacy code, as this is what a Java developer needs to do in his day-to-day coding. I have learned a lot of good stuff from this course and feel I know unit testing better than before. 

Hence I highly recommend this course to all Java developer who wants to learn unit testing or improve this their TDD skills.






5. Test-Driven Development Practices in Java [Plurlaisght]

This is another course I have included on Test-Driven Development (TDD) practices and tools supporting TDD on the Java Platform, including JUnit and Mockito. It nicely complements the previous course and covers things that are not covered theirs like PowerMock and DBUnit.

Instructor Mike is a solution architect for US Foods and has worked in technology for over 15 years. He holds roles focused on technical leadership, solution architecture, and enterprise architecture, which means you will learn a lot from his experience.

You would need a Pluralsight membership to access this course, which costs around $29 per month or $299 per year. It may seem costly, but to be honest with you, it's completely worth it as it gives you access to 5000+ online courses on Pluralsight and numerous quizzes and exercises to learn any technology you want.

best Java testing course Pluralsight


I was lucky to get the membership for just $199 in one of their sales, and I can tell you it's completely worth it. Anyway, even if you don't have a membership, you can still get access to this course by using their 10-day FREE Pass, which allows 200 minutes of entry, enough to complete this course.


That's all about some of the best courses to learn Mokcitor and JUnit. I have to tell my readers to learn unit testing for a long time. I included this as the first thing in my list of 10 things Java programmers should learn and shared some free courses to learn JUnit earlier. If you don't have any goal, make unit testing your top priority for this year.

Worth noting is that JUnit 5 tests will run with Java 8 or above, so it's also good to learn Java 8 if you haven't. Always remember, Writing better Unit Tests distinguishes Good Programmers from average Programmers.

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Thanks a lot for reading this article so far. If you like these best Test Driven Development, Mockito, and JUnit 5 online courses, please share them with your friends and colleagues. If you have any questions or feedback or want another class to add to this list, feel free to drop a note. All the best with your Unit testing journey.

P. S. - If you are looking for some free JUnit courses to start with, you can also look at this list of free classes to learn JUnit for unit testing in Java.

P. S. S. -If you like books more than courses, you can also check out this list of JUnit books for Java developers. 

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