Monday, July 1, 2024

My Favorite Free Courses to Learn JUnit and Mockito in 2024 - Best of Lot

 Hello guys, if you want to learn JUnit, one of the most important testing tool for Java developers and looking for online resources like books, online courses, tutorials, and interview questions then you have come to the right place. Earlier, I have shared best JUnit courses, books, tutorials, and Junit interview questions and in this article, I am going to share best free courses to learn JUnit in 2024. But, before we get to the 7 best free online courses that will teach you everything there is to learn about JUnit, let me tell you a little bit about what is JUnit and why it's important for a Java developer to learn JUnit in 2024. 


JUnit is a unit testing open-source framework for the Java programming language. It has set a very high benchmark when it comes to the testing of Java applications and now become a the standard unit testing framework for Java applications. 

I have been using JUnit from more than 15 years now. I started first with using JUnit 3 and then moved to JUnit 4 which lasted for quite a few years and now I am using JUnit 5 also known as JUnit Jupiter. All these years I have writing unit test for my Java code using JUnit and mocking libraries like Mockito.

The most important point about JUnit is that it is compatible with almost all of the important IDEs. That is the reason why companies all over the world Java developers have adopted JUnit for testing their Java applications.

Java Developers can use this framework for testing and executing automated tests during build time so it's also become crucial part of continuous integration or CI. Developers have to do this to make sure that nothing in the code is broken or not working.

Another key feature of JUnit is that it has a lot of graphs that represent the progress of a test. This graph shows a green color when the test is running smoothly but turns red if the test fails. It also allows developers to develop highly reliable and error-free code.

JUnit also plays a big role when it comes to regression testing. This basically refers to a type of software testing that checks if the most recent additions to a code adversely affect the integrity of the program. 

In short, its one of the must know tool for Java developers and every Java dev should learn JUnit as early as possible. So, if you are starting with Java or have few years of Java experience, you should learn JUnit in 2024 itself. There is also an increased focus on Test Driven Development and nowadays companies prefer Software engineers who can write tests easily. 

By the way, if you can spend few bucks learning a key library like JUnit then I also recommend you to checkout Learn Java Unit Testing with Junit & Mockito in 30 Steps course on Udemy. It's a great course to learn JUnit quickly and it's also very affordable, you can get it for just $9.9 on Udemy sale which happens every now and then. 

And, here is a nice diagram which explains the JUnit architecture for JUnit 5 

5 Free Courses to Learn JUnit and Mockito



5 Best Free JUnit Courses for Beginners in 2024

Here is a list of the 5 best free courses you can use to learn JUnit and unit testing in Java world. Most of these courses are from Udemy, which is also my go-to source for learning anything free. I am also looking for free JUnit courses from other places like YouTube and Coursera and if I found a decent one, I will also add it here. 

1. Java Unit Testing with JUnit - Beginners (Free)

This is a new free course on Udemy that will teach you everything you need to know about JUnit along with testing Java code from absolute scratch. In this course you will first write Java program and then write JUnit test cases for those program. 

Along the way you will learn about essential JUnit annotations like @BeforeEach, @AfterEach, @Test, @Disabled, and much more. You will also learn about how JUnit works like which method is called when. 

For example @BeforeEach is called before calling any method which is annotated by @Test annotation and @AfterEach is called after calling any method which is annotated by @Test annotation. 

Course Duration: 1 hours 49 minutes
Course Rating: 4.0 stars out of 5
Course Instructor: EDUCBA Bridging the Gap
Course Price: Free

Talking about the social proof, this is a new course so it doesn't have much rating and reviews but more than 1149 students have already joined this course and it has got on average 4.0 rating from a couple of learners which is not bad. More importantly, it is free and it got almost 2 hours of content covering JUnit in detail. 

Top 5 Free JUnit Courses For Beginners


2. Hamcrest Quick Start: Enhanced JUnit Syntax and Capabilities [Free]

Hamcrest is another open source library which makes writing unit test easier in Java. It provide methods which allows you to write test in fluent style which makes it easy to understand what is test and how its tests. I have also used Hamcrest before and I can say from my own experience that it definitely make your unit test more expressive.

In this fantastic free course, you will learn about all the core features of Hamcrest and how you can use them along with JUnit with good examples.

You will not only learn how to use Hamcrest matchers to make test more expressive and expanding JUnit capabilities but also learn about custom Hamcrest Matchers to further ease your JUnit test development.

Course Duration: 2 hours
Course Rating: 4.6 stars 
Course Instructor: Craig Hawkins
Course Price: Free

Talking about social proof, more than 1,957 student have already joined this course and it has on average 4.5 rating from 22 students which is not bad for a free course. If you are looking for a crash course on Hamcrest and how to use it with JUnit then this free course is for you. 

This  is another free course from Craig Hawkins, author of previous course on Hamcrest. This is a beginner level course to learn  fundamentals of JUnit quickly and easily through examples and practice. You should actually join this course before you join the Hamcrest one if you are new to JUnit. 

In this short, half-an hour course, you will learn about how to write JUnit test and make assertions using assertEquals(), assertTrue(), assertFalse() and other JUnit assertion method. You will also learn about key JUnit annotations like @Test,  @BeforeEach, @BeforeClass, @AfterEach, and @AfterClass. 

Course Duration: 34 minutes 
Course Rating: 4.3 stars out of 5
Course Instructor: Craig Hawkins
Course Price: Free

You will also learn about coding best practices and testing best practices along with advanced JUnit features like testing for exception. 

Talking about social proof, it's one of the most popular free Udemy course on JUnit with more than 10500 students already joined this course. On average it has 4.3 rating from close to 1000 participants which is great.

Although its short course, its pack with awesome learning material and if you are looking for a JUnit crash course to learn JUnit in 30 minutes, you should join this course. It's free and it just 30 minutes so you have nothing to lose but a valuable skill to gain.

 
This is a great free course for anyone who have never written a JUnit test before. In this course, you will learn how to write JUnit test cases using Eclipse IDE. The sample project is already provided so you don't need to create code but you will start with directly writing unit tests. 

Along the way, you will not only learn JUnit basics like annotations and assertions and how to write test but also how to debug your unit tests and how to improve them using Data Driven techniques. All these makes it a great free course for Java developers to learn JUnit. 

Course Duration: 47 minutes
Course Rating: 4.3 stars out of 5
Course Instructor: Best Test Automation
Course Price: Free

Although this is a short course with just 47 minutes, more than 2,116 students have already joined this course to learn JUnit and Unit testing in Java. On average it has got 4.3 rating from close to 35 participants which is not bad for a free course.

If you have never written a JUnit test or any unit test then you should join this free course. 

best free JUnit course for Java developers
This is a great free course for any Java developer who want to understand what is JUnit and how to use it to test your code. In this course you will not just write test but also test drive your application by improving the design of code. 

Along the way, you will also learn how to use Postman to write automate test and build your own Mock server. For mocking you will also learn how to use Mockito and WireMock to test an app which uses REST API client. 

Course Duration: 35 minutes
Course Rating: 3.9 stars out of 5
Course Instructor: George Covrig
Course Price: Free

Talking about social proof, this is a relatively new course and it only 862 students have joined this course. It has on average 3.9 rating out of 5 which is again not bad for any free JUnit course as only Java developer join them.  If you want to learn JUnit, Postman, Mockito, and WireMock for free then this course is for you. 
 
best free JUnit course for beginners




Conclusion

That's all about the best free online courses to learn JUnit in depth. These are great courses to learn not just Java unit testing but also various tools which makes Java unit testing easier like JUnit, Mockito, Hamcrest, WireMock, Postman etc. 

The list includes courses for all kind of Java developers like anyone who have never written JUnit test to programmers who know how to write test but also want to improve their knowledge of JUnit and Java Unit testing in general.

By the way, if you don't mind spending money to learn a key skill like unit testing and a tool like JUnit then I also recommend you to checkout Learn Java Unit Testing with Junit & Mockito in 30 Steps course on Udemy. It's a great course to learn JUnit quickly and it's also very affordable, you can get it for just $9.9 on Udemy sale which happens every now and then. 


Thank you for reading this far. If you have any issue while joining this course please let me know and if you have any suggest, please leave a comment. 
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