JUnit & Mockito: Java Testing
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About this course
JUnit & Mockito: Java Testing teaches how to write tests that Java and Spring developers rely on at work. It starts by testing a real method and writing a first test, then covers JUnit 5 annotations, assertions and lifecycle, parameterized and dynamic tests, Mockito mocks, stubs, spies and verification, testing the service and repository layers, Spring Boot integration tests with MockMvc and Testcontainers, coverage and flaky tests, and test design including TDD. The course has 169 lessons and about 1268 minutes of content. Each lesson is a short reading card with narration and diagrams, followed by MCQ practice with an explanation for every answer.
Who this Java testing course is for
Java developers, freshers in Java backend roles and engineering students preparing for Java interviews will find the course useful, because unit testing questions are common in those interviews and code reviews. The course assumes you already write Java with classes, interfaces and collections; if not, start with Java fundamentals. The later sections test Spring code, so some familiarity with Spring Boot fundamentals helps. Testers moving towards automation in Java can also follow it.
How MCQ practice works on Abekus
Each lesson is a short reading card with narration and diagrams, such as a picture of the order in which BeforeAll, BeforeEach and AfterEach run, or a view of a service class with its repository replaced by a Mockito mock. After the card, you answer MCQ practice items one at a time. Every answer comes with an explanation, so a wrong choice shows you why the correct option works. The course runs guided or self-paced, so you can follow the curriculum in order or move at your own pace. It is free with Abekus Pro, and otherwise it is paid in credits.
MCQ practice vs video courses for Java testing
Udemy and Coursera host long video courses on JUnit and Mockito where an instructor writes tests for one sample project. That format suits learners who want to watch tests being written line by line. This course asks the questions you face when writing tests yourself: whether a dependency needs a mock, a stub or a spy, why a verify call is over-specifying behaviour, which Spring test slice loads only what you need, or why a test passes alone but fails in the suite. MCQ practice suits learners who want that judgement.
Best way to learn JUnit and Mockito
Open a small Java or Spring project and add tests after each topic, starting with plain JUnit assertions and moving to mocks only when a real dependency gets in the way. Answer each MCQ before reading its explanation. Revisit Stubs vs Mocks and When Not to Mock a few days later, since over-mocking is the most common mistake in real codebases. Try one red, green, refactor cycle on a small feature, so the TDD in Practice lessons connect to code you have written.