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API Testing and Development with Postman

By : Dave Westerveld

4.2 (18)

API Testing and Development with Postman

4.2 (18)

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.

Preface

Preface

Who this book is for

What this book covers

To get the most out of this book

Download the example code files

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Conventions used

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Section 1: API Testing Theory and Terminology

Section 1: API Testing Theory and Terminology

Free Chapter

Chapter 1: API Terminology and Types

Chapter 1: API Terminology and Types

What is an API?

Types of API calls

Installing Postman

The structure of an API request

Considerations for API testing

Different types of APIs

Summary

Chapter 2: Principles of API Design

Chapter 2: Principles of API Design

Technical requirements

Start with the purpose

Creating usable APIs

Document your API

Designing an API

Summary

Chapter 3: OpenAPI and API Specifications

Chapter 3: OpenAPI and API Specifications

Technical requirements

What are API specifications?

Creating OASes

Using API specifications in Postman

Summary

Chapter 4: Considerations for Good API Test Automation

Chapter 4: Considerations for Good API Test Automation

Technical requirements

Exploring and automating

Organizing and structuring tests

Creating maintainable tests

Summary

Section 2: Using Postman When Working with an Existing API

Section 2: Using Postman When Working with an Existing API

Chapter 5: Understanding Authorization Options

Chapter 5: Understanding Authorization Options

Understanding API security

API security in Postman

Security testing with Postman

Summary

Chapter 6: Creating Test Validation Scripts

Chapter 6: Creating Test Validation Scripts

Technical requirements

Checking API responses

Setting up pre-request scripts

Using environments in Postman

Summary

Chapter 7: Data-Driven Testing

Chapter 7: Data-Driven Testing

Technical requirements

Defining data-driven testing

Creating a data-driven test in Postman

Challenge – data-driven testing with multiple APIs

Summary

Chapter 8: Running API Tests in CI with Newman

Chapter 8: Running API Tests in CI with Newman

Technical requirements

Getting Newman set up

Understanding Newman run options

Reporting on tests in Newman

Integrating Newman into CI builds

Summary

Chapter 9: Monitoring APIs with Postman

Chapter 9: Monitoring APIs with Postman

Technical requirements

Setting up a monitor in Postman

Viewing monitor results

Summary

Chapter 10: Testing an Existing API

Chapter 10: Testing an Existing API

Technical requirements

Finding bugs in an API

Automating API tests

An example of automated API tests

Sharing your work

Summary

Section 3: Using Postman to Develop an API

Section 3: Using Postman to Develop an API

Chapter 11: Designing an API Specification

Chapter 11: Designing an API Specification

Technical requirements

Creating an API specification

Adding the API to Postman

Understanding API versioning

Summary

Chapter 12: Creating and Using a Mock Server in Postman

Chapter 12: Creating and Using a Mock Server in Postman

Technical requirements

Different approaches to testing with mocks

Setting up a mock server

Creating good mock responses

Using mock servers

Summary

Chapter 13: Using Contract Testing to Verify an API

Chapter 13: Using Contract Testing to Verify an API

Understanding contract testing

Setting up contract tests in Postman

Running and fixing contract tests

Summary

Chapter 14: Design and Create an API

Chapter 14: Design and Create an API

Technical requirements

Designing an API

Setting up the API in Postman

Creating tests and documentation for the API

Sharing what you have done

Summary

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What this book covers

Chapter 1, API Terminology and Types, covers some of the basic terminology used in API testing and development, along with providing an explanation of the different types of APIs.

Chapter 2, Principles of API Design, covers the design principles that apply to API creation and testing.

Chapter 3, OpenAPI and API Specification, explains what API specifications are and enables you to get started using them in Postman.

Chapter 4, Considerations for Good API Test Automation, explains how to execute long-lasting and useful API test automation in Postman.

Chapter 5, Understanding Authorization Options, explains how to use many of the common API authorization options in Postman.

Chapter 6, Creating Test Validation Scripts, explains how to create and use test scripts in Postman.

Chapter 7, Data-Driven Testing, explains how to use data-driven testing in Postman to create scalable API tests.

Chapter 8, Running API Tests in CI with Newman, explains how to run API tests at the command line with the Newman application.

Chapter 9, Monitoring APIs with Postman, explains how to monitor the production usage of APIs with Postman Monitoring.

Chapter 10, Testing an Existing API, goes through an existing API and explains what kinds of tests to add and how to add them.

Chapter 11, Designing an API Specification, goes in-depth in terms of how to create an OpenAPI specification that can be used in Postman.

Chapter 12, Creating and Using a Mock Server in Postman, explains how to set up and use mock servers.

Chapter 13, Using Contract Testing to Verify an API, explains what contract testing is and how you can create and use contract tests in Postman.

Chapter 14, Design and Create an API, covers all the steps involved in creating an API, from design through to specification and testing.

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