Unit Testing with Spring Boot + JUnit 5 + Mockito (Tutorial)

Explore software testing basics, distinguish unit and integration tests, and learn to write unit tests for a rest api using Spring Boot, JUnit 5, and Mockito.

Learn to write basic JUnit 5 tests, use before-each setup, and verify a calculator's multiply method with assertions, noting pass/fail outcomes and divide-by-zero edge cases.

Builds a domain and persistence layer for a rest api by defining a book entity and repository, wiring a controller, and driving development with unit tests using a dvd approach.

Implement the business layer of the book api in Spring Boot, exposing list, get by id, create, and update operations via a repository, preparing for unit testing.

Set up unit tests for the ebook controller with Mockito, mocking the book repository to verify get all books, get by id, create, update, and delete endpoints.

Test the get all books endpoint by mocking the book repository, issuing a get /book, and validating a 200 status with the expected book list.

Write a post api unit test in Spring Boot with JUnit 5 and Mockito, mock the repository, build requests, and verify creation of a book via /book.

Unit test the put API update operation for a book using spring boot, JUnit 5, and Mockito by finding and updating a record, then validating the JSON response.

Apply test-driven development to build a delete endpoint in a spring boot API, using junit 5 mocks to verify a 200 OK delete and handle not-found cases.