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Learn Java Unit Testing with Junit & Mockito in 30 Steps

Learn Mockito and JUnit - the most popular Java unit testing and mocking frameworks - with 25 Examples
(14,097 reviews)
63,389 students
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Platform: Udemy
Video: 4h 45m
Language: English
Next start: On Demand

Table of contents


Writing Great Unit Tests distinguishes Good Programmers from Great Programmers.
In this course, you will learn how to Write Great Java Unit Tests with Mockito and JUnit.

5 STARS – When I’ve started this course I had very basic knowledge of JUnit and Mockito and now everything is clearer. It is a very good course for beginners. Everything was very well explained. 
5 STARS – As always, Ranga offers an excellent way of teaching: coding from scratch, good explanation, useful examples for the real world job. He is not only an experienced programmer, but also a great teacher. I learned more than I expected. Thanks
5 STARS – It was my long time wish to learn Mockito and this instructor nailed it. Best 5hrs I spent ever. He is really good in what he is doing. 
5 STARS – This course is a great tutorial to unit testing and standard practices of mocking. I would recommend it to even experienced developers who would be surprised to find some new ideas in here. Explanations are precise and detailed. Well done.
5 STARS – Very interesting course with good examples. Every topic was easy to understand because of author’s awesome explanation. I rate this course as 5/5.
5 STARS – Very good course. The approach is very systematic and step by step. I really like the combination of theory and practical goes hand by hand. The journey from JUnit to Mockito to Powermock is very well described.

You take 12 steps with JUnit and 18 steps with Mockito into unit testing proficiency.
Mocking with Mockito
•Step 01 : Set up an Eclipse Project with JUnit and Mockito frameworks. First Green Bar.
•Step 02 : Example to start understanding why we need mocks.
•Step 03 : What is a stub? Create an unit test using Stub? Disadvantages of Stubs.
•Step 04 : Your first Mockito code! Hurrah!!! Lets use Mockito to mock TodoService.
•Step 05 : Stubbing variations with Mockito. A few mockito examples mocking List class : Multiple return values, Argument Matchers and throwing exceptions.
•Step 06 : Introduction to BDD. Given When Then. BDD Mockito Syntax.
•Step 07 : How to verify calls on a mock? Verify how many times a method is called. We will add deleteTodo method to the TodoService.
•Step 08 : How to capture an argument which is passed to a mock?
•Step 09 : Hamcrest Matchers.
•Step 10 : Let’s simplify things with Mockito Annotations. @Mock, @InjectMocks, @RunWith(MockitoJUnitRunner.class), @Captor
•Step 11 : JUnit Rules. Using MockitoJUnit.rule() instead of @RunWith(MockitoJUnitRunner.class).
•Step 12 : Real world Example with Spring
•Step 13 : What is a spy? How to spy with Mockito?
•Step 14 : Some Theory : Why does Mockito not allow stubbing final and private methods?
•Step 15 : Using PowerMock and Mockito to mock a Static Method.
•Step 16 : Using PowerMock and Mockito to invoke a private Method.
•Step 17 : Using PowerMock and Mockito to mock a constructor.
•Step 18 : Good Unit Tests.

JUnit Framework
•Step 01 : Need for Unit Testing
•Step 02 : Setting up your First JUnit
•Step 03 : First Successful JUnit. Green Bar and assertEquals
•Step 04 : Refactoring Your First JUnit Test
•Step 05 : Second JUnit Example assertTrue and assertFalse
•Step 06 : @Before @After
•Step 07 : @BeforeClass @AfterClass
•Step 08 : Comparing Arrays in JUnit Tests
•Step 09 : Testing Exceptions in JUnit Tests
•Step 10 : Testing Performance in JUnit Tests
•Step 11 : Parameterized Tests
•Step 12 : Organize JUnits into Suites
Start Learning Now. Hit the Enroll Button!

You will learn

✓ You will Understand the Basics of Unit Testing with JUnit
✓ You will Learn the Most Popular Mocking Framework – Mockito
✓ You will Learn to Write Great Unit Tests using Mocking
✓ You will Learn to Use Mockito in combination with Junit and PowerMock


• You have an attitude to learn while having fun :)
• You have Java Programming Experience and ZERO Experience with Junit and Mockito
• We will help you install Eclipse and get up and running with Maven

This course is for

• Students who want to learn unit testing with Junit
• Students who want to learn mocking with Mockito
• We will help you install Eclipse and Maven
DevOps, Azure, GCP, Docker, Kubernetes, Java & Spring Boot
Ranga Karanam, the founder of in28minutes, has 2 decades of experience with technology – architecture, design, and programming.  We are helping learners take their first steps into modern cloud native technology and gain expertise on AWS, Azure, Google Cloud, Docker, Kubernetes amongst others.
Our happiest moments are when learners tag us on LinkedIn or reach out to us with their stories of getting their first job, getting a promotion, or a big raise.
Ranga is multi-cloud certified –  Google Cloud Certified Professional Cloud Architect, AWS Certified Solutions Architect Associate, Google Cloud Certified Associate Cloud Engineer, AWS Certified Developer Associate, AWS Certified Cloud Practitioner,  Azure Fundamentals Certified AZ-900, DP-900 and AI-900.
Our courses are focused on Cloud Certifications (AWS, Azure, Google Cloud Platform – GCP), DevOps, Full Stack (  React, Angular ), Serverless, Programming, and Microservice Development with Java and Spring Boot.
Our Top Courses include:
1) Master Microservices with Spring Boot and Spring Cloud
2) Java Programming for Complete Beginners
3) Google Cloud Certification – Associate Cloud Engineer – 2021
4) DevOps For Beginners – Docker, Kubernetes, and Azure DevOps
5) Spring Framework Master Class – Java Spring the Modern Way
6) Master Java Web Services and RESTful API with Spring Boot
7) Go Serverless with AWS Lambda and Azure Functions
We have courses focused on Java Frameworks ( Spring, Spring Boot, Spring MVC,  Hibernate ).
[LEARNING PATHS 00 to 06 for DevOps, Full Stack, Cloud,  Spring Boot and Java in the FAQ below]
We use Problem-Solution based Step-By-Step Hands-on Approach With Practical, Real-World Application Examples.
We have a wide range of courses focused on Spring Boot –  Creating APIs and Microservices, Deploying to Cloud ( AWS, Azure, Docker, Kubernetes, Azure ), and Integrating with Full Stack Front end frameworks ( React & Angular ).


[LEARNING PATH 00] – DevOps 
Master DevOps with Docker, Kubernetes and Azure DevOps

[LEARNING PATH 01] – Spring and Spring Boot Web Applications & API Developer
Spring Framework Master Class – Learn Spring the Modern Way!
Learn Spring Boot in 100 Steps – Beginner to Expert
Master Java Web Services and RESTful API with Spring Boot
Master Hibernate and JPA with Spring Boot in 100 Steps
Master Java Unit Testing with Spring Boot & Mockito

[LEARNING PATH 02] – Full Stack Developer with Spring Boot, React and Angular
Go Java Full Stack with Spring Boot and React
Go Java Full Stack with Spring Boot and Angular

[LEARNING PATH 03] – Cloud Microservices with Spring Boot, Docker & Kubernetes
Master Microservices with Spring Boot and Spring Cloud
Master Docker with Java – DevOps for Spring Microservices
Master Kubernetes with Docker on Google Cloud, AWS & Azure

[LEARNING PATH 04] – Cloud Developer with Spring Boot, AWS, Azure, and PCF
Learn AWS – Deploy Java Spring Boot to AWS Elastic Beanstalk
Master Azure Web Apps – Take Java Spring Boot Apps to Azure
Master Pivotal Cloud Foundry with Spring Boot Microservices

[LEARNING PATH 05] – Learn AWS with Microservices, Docker, and Kubernetes
Learn AWS – Deploy Java Spring Boot to AWS Elastic Beanstalk
Master AWS Fargate & ECS with Java Spring Boot Microservices
Master Kubernetes with Docker on Google Cloud, AWS & Azure

AWS Certified Cloud Practitioner – Step By Step
AWS Certified Developer Associate  – Step By Step
AWS Certified Solutions Architect Associate – Step By Step

Best Courses are interactive and fun.
Foundations for building high-quality applications are best laid down while learning.

We use the 80-20 Rule. We discuss 20% of things used 80% of the time in depth. We touch upon other things briefly equipping you with enough knowledge to find out more on your own.
Problem Solution based Step by Step Hands-on Learning.

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Platform: Udemy
Video: 4h 45m
Language: English
Next start: On Demand

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