Book Image

Writing API Tests with Karate

By : Benjamin Bischoff
Book Image

Writing API Tests with Karate

By: Benjamin Bischoff

Overview of this book

Software in recent years is moving away from centralized systems and monoliths to smaller, scalable components that communicate with each other through APIs. Testing these communication interfaces is becoming increasingly important to ensure the security, performance, and extensibility of the software. A powerful tool to achieve safe and robust applications is Karate, an easy-to-use, and powerful software testing framework. In this book, you’ll work with different modules of karate to get tailored solutions for modern test challenges. You’ll be exploring interface testing, UI testing as well as performance testing. By the end of this book, you’ll be able to use the Karate framework in your software development lifecycle to make your APIs and applications robust and trustworthy.
Table of Contents (15 chapters)
1
Part 1:Karate Basics
7
Part 2:Advanced Karate Functionalities

Using Karate as a mock server

API mocks (or test doubles, as Karate prefers to call them) are pieces of code that simulate APIs that are dependencies of certain test scenarios. By using these instead of the real APIs, tests can run much faster and more stable since these mocks are always available and provide exactly the data that is expected. Also, if tests need to be written even though certain APIs are only specified but not implemented yet, mocks are a great choice. Later, they can potentially be replaced by real implementations.

A great point is that these mocks can keep their state. This means it is potentially possible to simulate full Create, Read, Update, Delete (CRUD) APIs that can add, get, edit, and remove data.

Authoring a mock scenario

Karate has a very straightforward built-in way to define and use mocks by employing nothing more than the same conventions that are used to write test scenarios. Let’s see what this means.

For our example, we will mock...