Book Image

Mastering Spring Cloud

By : Piotr Mińkowski
Book Image

Mastering Spring Cloud

By: Piotr Mińkowski

Overview of this book

Developing, deploying, and operating cloud applications should be as easy as local applications. This should be the governing principle behind any cloud platform, library, or tool. Spring Cloud–an open-source library–makes it easy to develop JVM applications for the cloud. In this book, you will be introduced to Spring Cloud and will master its features from the application developer's point of view. This book begins by introducing you to microservices for Spring and the available feature set in Spring Cloud. You will learn to configure the Spring Cloud server and run the Eureka server to enable service registration and discovery. Then you will learn about techniques related to load balancing and circuit breaking and utilize all features of the Feign client. The book now delves into advanced topics where you will learn to implement distributed tracing solutions for Spring Cloud and build message-driven microservice architectures. Before running an application on Docker container s, you will master testing and securing techniques with Spring Cloud.
Table of Contents (22 chapters)
Title Page
Copyright and Credits
Packt Upsell

Contract tests

There are some interesting tools especiallydedicated to contract testing. We will discuss this concept by looking at two of the most popular tools—Pact and Spring Cloud Contract.

Using Pact

As we have already mentioned, the main concept around contract tests is to define a contract between the consumer and provider, and then verify it independently for each service. Since the responsibility for creating and maintaining a contract lies mainly on the consumer side, this type of test is usually referred to as a consumer-driven test. The division into a consumer and provider side is clearly visible in Pact JVM. It provides two separated libraries, the first prefixed by pact-jvm-consumer and the second prefixed by pact-jvm-provider. Of course, the contract is created by the consumer in agreement with the provider, which has been illustrated in the following diagram:

Pact is, in fact, a collection of frameworks that provide support for consumer-driven contract testing. These implementations...