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Mockito & JUnit 5 Mastery: Complete Java Testing Course
Published 11/2025
Duration: 6h 59m | .MP4 1920x1080 30fps(r) | AAC, 44100Hz, 2ch | 4.70 GB
Genre: eLearning | Language: English
Learn JUnit 5 & 4, Mockito 3, Mocking, Stubbing, Test Doubles, Behavior Verification, BDD, ArgumentCaptor & Matchers.
What you'll learn
- Understand the fundamentals of Unit Testing in Java.
- Learn and implement different Test Doubles: Fake, Dummy, Stub, Mock, and Spy.
- Set up Java projects with JUnit 5 and JUnit 4 using Maven.
- Master Mockito 3 for creating mocks, stubs, and spies.
- Use Mockito annotations, extensions, and runners for efficient testing.
- Apply stubbing techniques including when(), thenReturn(), doReturn(), and void methods.
- Handle common Mockito misuse and exceptions like UnfinishedStubbingException and PotentialStubbingException.
- Perform behavior verification to ensure correct interactions with mocks and spies.
- Use ArgumentCaptor and Argument Matchers effectively for real-world test scenarios.
- Apply BDDMockito and Behavior-Driven Development practices in unit tests.
Requirements
- Basic knowledge of Java programming.
- Understanding of object-oriented concepts in Java.
- A working Java development environment (JDK, IDE like Eclipse/IntelliJ, Maven).
- No prior experience with Mockito or JUnit is required - beginners are welcome.
Description
Great Unit Tests turn good developers into exceptional developers.And nothing strengthens your Java testing skills more than mastering JUnit and Mockito together.
In this course, you will learn Real-World Java Unit Testing from the ground up - starting with the fundamentals of Unit Testing and Test Doubles, all the way to advanced mocking, stubbing, behavior verification, BDD, ArgumentCaptor, Argument Matchers, and much more.
This course is designed to take you from absolute beginner to confident professional in a clear, simple, and hands-on way.
Whether you're preparing for a job interview, writing tests at work, or improving code quality in your projects - this course will give you all the skills you need.
What You Will Learn
Learn Unit Testing with clarity and simplicity
Understand all types of Test Doubles (Fake, Dummy, Stub, Mock, Spy)
Master Mockito from basics to advanced usage
Write clean, structured, professional tests
Avoid common Mockito mistakes and misuse
Build confidence to work in real industry-level Java projects
Learn both JUnit 5 and JUnit 4 setups
Apply Behavior-Driven Development (BDD) with Mockito
This course is structured in a practical, step-by-step teaching style, ensuring every concept is clearly explained, demonstrated in code, and reinforced with examples.
Course Highlights
You will progress through multiple stages of Mockito and JUnit mastery - starting with theory, then applying each concept in real Java code.
Unit Testing Foundations
Introduction to Unit Testing
Introduction to Test Doubles
Maven Setup with JUnit 5
Test Doubles Without Mockito
Fake Test Double
Dummy Test Double
Stub Test Double
Spy Test Double
Mock Test Double
Project Setup
Project setup with JUnit 5 and Maven
Project setup with JUnit 4 and Maven
Mockito Essentials
What is Mocking?
Introduction to Mockito
Creating Fake, Dummy, Stub, Mock, and Spy using Mockito
Creating Mocks using Annotations
Mockito Extension (JUnit 5)
MockitoJUnitRunner (JUnit 4)
MockitoAnnotations.initMocks
Mockito Rule
Stubbing Methods
What is Stubbing?
Stubbing with when() and thenReturn()
Stubbing with doReturn() and when()
Stubbing multiple calls of the same method
Stubbing void methods
Mockito Misuse (Real-World Errors)
UnfinishedStubbingException
PotentialStubbingException
You will learn exactly why these errors happen and how to fix them.
Behavior Verification
Verify simple interactions
Verify number of method invocations
Verify no interactions
Verify order of interactions
Verify min/max invocation count
Exception Handling
Exceptions in non-void methods
Exceptions in void methods
ArgumentCaptor
ArgumentCaptor without annotations
ArgumentCaptor using annotations
Spy Deep Dive
What is Spy in Mockito?
Spy using annotations
Stubbing a Spy
Verifying Spy behavior
Behavior-Driven Development (BDD)
Introduction to BDD
Stubbing with BDDMockito
Behavior verification with BDDMockito
Exception handling in BDD
Argument Matchers
Introduction to Matchers
Type Matchers
Specific Type Matchers
Collection Matchers
String Matchers
Common Matcher Misuse
Why This Course?
Covers everything from basics to advanced Mockito usage
Real project scenarios and examples
Clear explanations and step-by-step approach
Both JUnit 4 and JUnit 5 covered
Includes BDD, verification, argument capturing, and exception handling
Ideal for beginners, students, and working professionals
Start Learning Now
Enroll today and begin your journey toward becoming a confident, highly skilled Java tester using JUnit and Mockito.
Who this course is for:
- Java developers who want to master unit testing.
- Software engineers preparing for technical interviews involving testing.
- Beginners who want to learn JUnit 5, JUnit 4, and Mockito from scratch.
- Professionals looking to improve code quality through effective unit tests.
- Developers interested in BDD, behavior verification, and advanced mocking techniques.
More Info
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