Test-Driven Development in Spring Boot with JUnit and Mockito

2h 8mAdvanced2025-01-15

Authors

Maaike van Putten

Trainer and Developer for Java, Python, Spring Boot, and More

Course details

If you’ve ever run out of time to write tests for your code, you know what a potential disaster you’re flirting with. Test-driven development (TDD) lets you write the test before the implementation code, essentially using the test to guide your development process. This course shows you how to apply TDD principles with Spring Boot projects. No prior knowledge of TDD is assumed, so instructor Maaike van Putten starts off by introducing TDD and showing a plain example. Then, move on to setting up the environment that will be used so you can follow along. After that, find out how to develop the different layers of a REST API the TDD way: controller layer, service layer, and the repository/data layer. Finally, Maaike wraps up the course up with some TDD best practices.

Learning objectives
Apply TDD principles with Spring Boot projects.
Use JUnit and Mockito in a TDD environment.
Understand how to test the different layers of a Spring Boot REST API.

Skills covered

JUnitSpring BootJavaWeb Development ToolsAdvancedOracleSoftware Development ToolsWeb DevelopmentProgramming LanguagesOpen SourceSoftware Development

Concepts

0. Introduction

01 - Test-driven development in Spring Boot

1. TDD and Spring Boot

02 - Introduction to TDD in Spring Boot
03 - Setting up the development environment

2. Writing Your First TDD Test

04 - Red phase - Write a failing test
05 - Green phase - Implement the minimal code to pass the test
06 - Refactor phase - Improve the code quality
07 - Repeat - Adding more features

3. TDD for the Data Layer

08 - Writing TDD test for the repository
09 - Implementing the repository
10 - Integration testing with an in-memory database
11 - Refactoring the data layer
12 - Repeat - Adding the rest of the data layer

4. TDD for Services with Mockito

13 - Quick overview of working with Mockito
14 - Writing a TDD test for the service layer
15 - Implementing the method in the service layer
16 - Refactoring the service
17 - Repeat - Adding the rest of the service layer

5. TDD for Controllers and RESTful APIs

18 - Working with MockMvc
19 - Writing the first TDD test for the controller
20 - Implementing the method of the controller
21 - Refactoring the first method of the controller
22 - Repeat - Adding the rest of the controller layer

6. TDD Best Practices

23 - Common pitfalls to avoid
24 - Best practices for writing maintainable tests
25 - TDD workflow in real projects

Conclusion

26 - Next steps