Mockito Tutorial : Learn mocking with 25 Junit Examples

Learn unit testing and mocking with 25 Junit Examples

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Course Description

Writing great unit tests distinguishes good programmers from great programmers. In this course, you will learn how to write great unit tests with Mockito and JUnit. You take 12 steps with JUnit and 18 steps with Mockito into unit testing proficiency.


  • 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.


  • 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

What are the requirements?

  • You are expected to be familiar with Java
  • You are NOT expected to have any experience with Eclipse or Maven
  • We will help you install Eclipse and get up and running with Maven

What am I going to get from this course?

  • Use Mockito to write great unit tests
  • Understand the basics of unit testing
  • Understand how to use JUnit and Mockito together

What is the target audience?

  • 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

Your Instructor


About Me

I'm Ranga Karanam, an Architect with 15 Years of Java programming and design with major banking clients across the world.

We started in28Minutes with the aim to create Hands-on Courses with Real World Projects. Step-By-Step series of Courses is one of our creations.

About in28Minutes

We use Problem-Solution based Step-By-Step Hands-on Approach With Practical, Real World Application Examples.

While our primary expertise is on Development, Design & Architecture of Java & Related Frameworks (Spring, Spring MVC, Struts, Hibernate) we are expanding into the front-end world (Bootstrap, JQuery, Angular JS).

Our Beliefs

Best Courses are interactive and fun.

Foundations for building high quality applications are best laid down while learning.

Our Approach

We love open source and therefore, All our code is open source too and available on Github.

We use 80-20 Rule. We discuss 20% things used 80% of 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.

Class Curriculum

  Section 1: Introduction
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days after you enroll
  Section 3 : Getting Ready For Mockito
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Frequently Asked Questions

When does the course start and finish?
The course starts now and never ends! It is a completely self-paced online course - you decide when you start and when you finish.
How long do I have access to the course?
How does lifetime access sound? After enrolling, you have unlimited access to this course for as long as you like - across any and all devices you own.
What if I am unhappy with the course?
We would never want you to be unhappy! If you are unsatisfied with your purchase, contact us in the first 30 days and we will give you a full refund.

Get started now!