Book Image

Learning Spring Boot 2.0 - Second Edition

By : Greg L. Turnquist, Greg L. Turnquist
Book Image

Learning Spring Boot 2.0 - Second Edition

By: Greg L. Turnquist, Greg L. Turnquist

Overview of this book

Spring Boot provides a variety of features that address today's business needs along with today's scalable requirements. In this book, you will learn how to leverage powerful databases and Spring Boot's state-of-the-art WebFlux framework. This practical guide will help you get up and running with all the latest features of Spring Boot, especially the new Reactor-based toolkit. The book starts off by helping you build a simple app, then shows you how to bundle and deploy it to the cloud. From here, we take you through reactive programming, showing you how to interact with controllers and templates and handle data access. Once you're done, you can start writing unit tests, slice tests, embedded container tests, and even autoconfiguration tests. We go into detail about developer tools, AMQP messaging, WebSockets, security, and deployment. You will learn how to secure your application using both routes and method-based rules. By the end of the book, you'll have built a social media platform from which to apply the lessons you have learned to any problem. If you want a good understanding of building scalable applications using the core functionality of Spring Boot, this is the book for you.
Table of Contents (11 chapters)

Testing WebFlux controllers

So far, we've looked at unit testing as well as slice testing for MongoDB. These are good for covering services and backend logic. The last part we need to ensure is whether the web controllers are working properly.

Spring Boot comes with automated support to help us pick the exact type of test that we want to run. Let's start with an example:

    @WebFluxTest(controllers = HomeController.class) 
    public class HomeControllerTests { 
      WebTestClient webClient; 
      ImageService imageService; 

This preceding beginning of a controller test case can be described as follows:

  • @RunWith(SpringRunner.class) ensures all of our Spring Framework and Spring Boot test annotations integrate properly with JUnit...