Book Image

API Testing and Development with Postman

By : Dave Westerveld
1 (1)
Book Image

API Testing and Development with Postman

1 (1)
By: Dave Westerveld

Overview of this book

Postman enables the exploration and testing of web APIs, helping testers and developers figure out how an API works. With Postman, you can create effective test automation for any APIs. If you want to put your knowledge of APIs to work quickly, this practical guide to using Postman will help you get started. The book provides a hands-on approach to learning the implementation and associated methodologies that will have you up and running with Postman in no time. Complete with step-by-step explanations of essential concepts, practical examples, and self-assessment questions, this book begins by taking you through the principles of effective API testing. A combination of theory coupled with real-world examples will help you learn how to use Postman to create well-designed, documented, and tested APIs. You'll then be able to try some hands-on projects that will teach you how to add test automation to an already existing API with Postman, and guide you in using Postman to create a well-designed API from scratch. By the end of this book, you'll be able to use Postman to set up and run API tests for any API that you are working with.
Table of Contents (19 chapters)
1
Section 1: API Testing Theory and Terminology
6
Section 2: Using Postman When Working with an Existing API
13
Section 3: Using Postman to Develop an API

Setting up a mock server

There are a couple of different ways in which you can create mock servers in Postman. In this section, I will show you how to set one up that is based on a specification file. This will be the primary use case that I cover in this chapter, but I will also make sure that you understand some of the other ways that you create mock servers as well.

Creating a mock server from a specification file

In the previous chapter, I walked you through how to set up an API specification for a to-do list API. You may want to go back to that chapter and see how that was done, or you can download the specification from the GitHub repository (https://github.com/PacktPublishing/API-Testing-and-Development-with-Postman) for this book and import it into Postman as a starting point. If you do create the API from the imported OpenAPI definition file, ensure that the Generate collection from imported APIs option is selected and set the Link this collection as option to Test...