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

Organizing and structuring tests

As the saying goes, an ounce of prevention is worth a pound of cure. This is good general life advice and is also true in test automation. Taking a bit of time to structure and organize your tests when you are starting will save you a lot of time later, when you are trying to understand test failures or reports on test effectiveness. Postman understands this philosophy and makes it easy to keep tests well-organized.

It is too easy to spout off a bunch of theory that you will skim over and not fully understand. In order to keep this practical, I will try to walk through a concrete example. I will once again use the Star Wars API for this (https://swapi.dev/). So, how would you go about structuring the tests for this API?

Creating the test structure

Let's start with the obvious thing – collections. One way you can think of a collection is as a folder that you can collect items, such as other folders and tests. You may already have...