Course
Introduction to Testing in Java
AdvancedSkill Level
Updated 12/2025JavaProgramming3 hr10 videos36 Exercises2,900 XPStatement of Accomplishment
Create Your Free Account
or
By continuing, you accept our Terms of Use, our Privacy Policy and that your data is stored in the USA.Loved by learners at thousands of companies
Training 2 or more people?
Try DataCamp for BusinessCourse Description
Why Testing Matters
Testing is one of the most important skills that separates beginners from professional software engineers. In the real world, especially in enterprise environments, any code that is not tested is assumed to be broken. Testing is not an optional step - it is a fundamental responsibility of software engineers and a key part of maintaining robust and resilient Java applications. Java is widely known for its stability and reliability, and testing plays a major role in upholding these qualities.What You Will Learn
This course will guide you through the core concepts of software testing in Java. You will start by learning about the most common types of tests and how they are used to improve code quality and application behavior. You will gain hands-on experience with JUnit, the most widely used testing framework in the Java ecosystem, and learn how to simulate complex testing scenarios using Mockito. As you progress, you will apply the methodology of Test Driven Development and learn to write both parameterized and integration tests. By the end of the course, you will have the tools and techniques you need to confidently write meaningful tests that ensure your code is reliable, maintainable, and production-ready.Prerequisites
Input/Output and Streams in Java1
Foundations of Testing
Start by exploring automated software testing and the typical pitfalls it helps avoid. Then, gain hands-on experience with Java's JUnit 5 library and learn to structure and write unit tests.
2
Testing with Dependencies
Examine how software components interact and rely on each other, and see how integration testing verifies these interactions by testing a class alongside its dependencies. This chapter then introduces mocking as a method to simulate dependencies and focus testing on the logic being evaluated.
3
Further techniques and annotations
Explore multiple ways to make testing less verbose. One way to do so is parameterizing tests; another is using the @BeforeEach annotation. Finally, it presents a new way to think about testing.
Introduction to Testing in Java
Course Complete
Earn Statement of Accomplishment
Add this credential to your LinkedIn profile, resume, or CVShare it on social media and in your performance reviewEnroll Now
FAQs
Do I need to know Java before taking this course?
Yes, this course assumes you're comfortable writing Java code, including working with classes, methods, and objects. No prior experience with testing frameworks is required.
Will I learn how to use JUnit from scratch?
Absolutely. The course introduces JUnit step by step, so even if you've never used it before, you'll learn how to write and run tests with confidence.
What is Mockito, and why should I learn it?
Mockito is a popular Java library used to create mock objects in tests. Learning it helps you test parts of your code in isolation, which is essential for writing clean, maintainable tests in real-world applications.
How does this course help me write better Java code?
By focusing on testing, you’ll learn to think more critically about how your code behaves. Writing tests encourages cleaner design, exposes edge cases, and helps you catch bugs before they become problems.
Join over 19 million learners and start Introduction to Testing in Java today!
Create Your Free Account
or
By continuing, you accept our Terms of Use, our Privacy Policy and that your data is stored in the USA.Grow your data skills with DataCamp for Mobile
Make progress on the go with our mobile courses and daily 5-minute coding challenges.