Unit testing is a crucial practice for Java developers, ensuring the quality and reliability of their code.
It involves writing small, independent tests to verify the functionality of individual components, catching bugs early in the development process and preventing regressions.
By mastering unit testing, you can write more robust code, reduce the time spent debugging, and gain confidence in the stability of your applications.
Finding the right JUnit course on Udemy can be overwhelming, especially when you’re seeking a program that covers both JUnit and the popular mocking framework Mockito.
You want a course that’s comprehensive, engaging, and taught by experienced professionals who can guide you through the intricacies of writing effective unit tests.
For the best overall JUnit course on Udemy that also teaches Mockito, we recommend Learn Java Unit Testing with Junit & Mockito in 30 Steps.
This course stands out for its structured approach, covering both foundational JUnit concepts and advanced Mockito techniques in a clear and concise manner.
The instructor utilizes practical examples and real-world scenarios to make the learning process engaging and relevant, ensuring you can apply your new skills to real-world projects.
While Learn Java Unit Testing with Junit & Mockito in 30 Steps is our top pick, there are other great options available on Udemy that may better suit your learning style or specific needs.
Keep reading to explore our recommendations for various JUnit courses focusing on different aspects of unit testing and mocking, including JUnit 5, PowerMock, TDD, and BDD.
Learn Java Unit Testing with Junit & Mockito in 30 Steps
The course begins with an introduction to unit testing and why it’s crucial for writing high-quality code.
You’ll set up your first JUnit test and learn assertions like assertEquals, assertTrue, and assertFalse.
The course covers important JUnit concepts like @Before, @After, @BeforeClass, @AfterClass for setup/teardown, testing arrays, exceptions, performance, parameterized tests, and organizing tests into suites.
Before diving into Mockito, you’ll learn about the need for mocking and set up a Maven project.
The course then guides you through writing your first Mockito code, stubbing with argument matchers, BDD-style given/when/then syntax, verifying calls on mocks, and capturing arguments.
Advanced Mockito topics include Hamcrest matchers, annotations like @Mock, @InjectMocks, @Captor, JUnit rules, real-world examples with Spring, spies, and why Mockito doesn’t stub final/private methods.
You’ll also learn PowerMock for mocking static and private methods, constructors, and writing good tests.
Throughout the course, you’ll find tips on efficient learning, remembering concepts long-term, teaching others, and the importance of deep work.
Practical Java Unit Testing with JUnit 5
You’ll embark on a journey from the fundamentals of unit testing theory to mastering advanced JUnit 5 features.
The course starts by setting you up with IntelliJ IDEA, a popular IDE, and guides you through creating your first unit test.
You’ll learn essential concepts like best practices, testing exceptions, and handling null values and arrays.
You’ll also discover how to utilize JUnit 5 annotations like @BeforeEach, @AfterEach, @BeforeAll, and @AfterAll to effectively organize your tests.
As you progress, you’ll delve into advanced features like parameterized tests with ValueSource, CsvSource, and CsvFileSource, repeated tests, test performance optimization, and the powerful @Nested annotation for structuring your code.
Beyond the core functionalities of JUnit 5, the course introduces you to Test-Driven Development (TDD), a popular development approach where tests are written before the actual code.
You’ll put TDD into practice by building unit tests for a real-world application, RealEstateApp.
The course offers a well-structured learning experience with hands-on exercises, a quiz to test your understanding, and even tips on how to showcase your new skills on LinkedIn.
By completing this course, you’ll gain the confidence and skills to write effective and robust unit tests using JUnit 5, becoming a proficient Java unit tester.
JUnit and Mockito Crash Course
You will start by setting up the necessary software like Java SDK and Eclipse IDE.
After an overview of unit testing concepts, you will dive into JUnit, learning how to write basic tests, handle exceptions, and use annotations like @Before and @After.
The course then covers JUnit 5, guiding you through creating a Maven project, fixing annotations, and running tests using Maven.
You will learn to test with Mockito by mocking objects, stubbing methods, and verifying behavior.
Hands-on examples include testing order placement, negative scenarios, and exceptions.
Test coverage is emphasized, with instructions on installing EclEmma and measuring and improving code coverage.
Advanced Mockito topics like verification modes, stubbing void methods, and consecutive call testing are covered.
You will explore best practices, the F.I.R.S.T principle, test doubles, and partial mocking with spies.
The course progresses to testing a Maven-based Java web application, including parameterized JUnit tests and mocking static methods.
You will create Spring Boot microservices, integrate them, and test the applications using Mockito.
Real-world examples include testing a coupon service, an e-dating REST API, and implementing user registration, interest updates, and match finding.
Spring Boot Unit Testing with JUnit, Mockito and MockMvc
The course starts by reviewing JUnit, the popular Java testing framework, covering assertions, test lifecycle methods, custom display names, and more.
You’ll learn how to write unit tests for various scenarios, including conditional tests and parameterized tests.
The course then dives into Spring Boot unit testing, teaching you how to set up projects, read application properties, inject Spring beans, and test with assertions.
You’ll also learn about testing prototype beans, which is crucial in certain situations.
One of the key focuses of the course is mocking with Mockito.
You’ll get an in-depth understanding of how to create mock objects, set up method stubs, and verify method invocations.
The course covers throwing exceptions with mocks and using the MockBean annotation for Spring Boot applications.
Another important aspect covered is reflection test utils, which can be handy when working with private methods and fields.
The course walks you through coding examples to demonstrate how to use these utilities effectively.
The course includes a substantial project where you’ll apply the concepts learned to test a Spring Boot MVC web application.
You’ll learn how to perform database integration testing, set up and clean up test data, and test various aspects of the application, including the service layer, MVC controllers, and REST APIs.
Throughout the course, you’ll work with technologies like SQL, MySQL, Thymeleaf, and Maven, giving you a well-rounded understanding of how to test Spring Boot applications from different angles.
Testing Java with JUnit 5 & Mockito
You’ll start by grasping the fundamentals of unit testing, including the F.I.R.S.T principle, test isolation, and the testing pyramid.
As you progress, you’ll dive into JUnit 5, exploring its integration with build tools like Maven and Gradle, and learning to create and execute unit tests.
The course takes a hands-on approach, guiding you through practical exercises that reinforce concepts like assertions, test lifecycle methods, and naming conventions.
You’ll also learn advanced techniques like parameterized tests, repeated tests, and controlling test execution order.
Test-Driven Development (TDD) is a core focus, teaching you how to write tests before implementing code, fostering a more robust and maintainable codebase.
Mockito is introduced to mock dependencies, stub methods, and verify interactions, essential skills for testing complex systems.
Code coverage is emphasized, with lessons on generating reports and using tools like Jacoco to analyze test coverage.
The course then dives into testing Spring Boot applications, covering testing REST controllers, integration testing with all layers, and testing data layers with JPA entities and repositories.
Throughout the journey, you’ll work with real-world examples, building projects from scratch and enhancing existing codebases.
Quizzes and exercises solidify your understanding, ensuring you grasp the material before moving forward.
Testing Spring Boot App with JUnit, Mockito & Testcontainers
You’ll start by learning the fundamentals of unit and integration testing in Java.
The course then dives into best practices for unit testing with JUnit, a widely-used testing framework.
You’ll learn how to set up a Spring Boot project and write unit tests for different layers of the application, including the repository, service, and controller layers.
One of the standout features of this course is its coverage of Mockito, a popular mocking framework for Java.
You’ll learn how to use Mockito to create mock objects and test your code in isolation.
The course covers various Mockito techniques, such as using @Mock and @InjectMocks annotations, and testing scenarios with and without exceptions.
The course also covers integration testing using a local MySQL database and Testcontainers, a modern approach to running databases and other services in containerized environments.
Testcontainers simplify the setup and teardown of test environments, making integration tests more reliable and consistent.
In addition to testing traditional REST APIs, the course explores reactive programming with Spring WebFlux.
You’ll learn how to build and test reactive CRUD REST APIs using WebFlux, a reactive web framework from Spring.
This section covers unit and integration testing for reactive APIs, providing you with a well-rounded understanding of testing in both synchronous and asynchronous environments.
The course includes assignments and quizzes to reinforce your learning, as well as access to source code for all the examples covered.
Instant Test Driven Development with Java, JUnit and Mockito
You’ll start with the basics of TDD, learning the philosophy behind it and practicing with instant demos and longer examples.
The course dives deep into JUnit, the de facto standard for unit testing in Java, covering assertions, exceptions, timeouts, ignoring tests, and the test lifecycle.
One of the highlights is the comprehensive coverage of Mockito.
You’ll learn how to use mocks for isolating and testing individual components, with instant demos and in-depth examples.
The course explores various Mockito features like returning different values, verifying interactions, and handling exceptions.
Parameterized tests are also covered in detail, with demos and examples using both JUnit’s built-in support and third-party libraries like JUnitParams.
This can be a real time-saver when you need to test multiple scenarios with different inputs.
For those interested in testing Spring applications, the course has a dedicated section on using the SpringJUnitRunner and includes a worked example of building a Spring REST API using TDD.
The syllabus also touches on advanced topics like JUnit rules, custom runners, and behavior-driven development (BDD) with Mockito.
You’ll even learn how to leverage Java 8 features to reduce the need for mocking in certain cases.
Throughout the course, you’ll work with practical examples and get hands-on experience setting up projects in both IntelliJ and Maven.
JUnit 5, Mockito, PowerMock, TDD, BDD & ATTD
This course starts with an introduction to testing for software engineers, ensuring you understand the importance of testing in the development process.
You will learn JUnit 5, the latest version of the popular unit testing framework for Java.
The course dives deep into the JUnit 5 API, including advanced features and how to measure test code coverage.
It also covers the Hamcrest library for more expressive assertions.
Moving on, you’ll learn integration testing and how to use Mockito, a powerful mocking framework.
The course dedicates two entire sections to Mockito, ensuring you master all its features and capabilities.
Additionally, you’ll learn PowerMockito, which extends Mockito’s capabilities for more advanced use cases.
The course also covers essential testing methodologies like Test-Driven Development (TDD), Behavior-Driven Development (BDD), and Acceptance Test-Driven Development (ATTD).
You’ll learn the theory behind these methodologies and get hands-on practice implementing them.
Throughout the course, you’ll have unlimited access to the ‘Learn IT’ application, allowing you to apply what you’ve learned in a practical setting.
The course also includes a communication plan to ensure you can get your questions answered and stay on track.