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API Testing with Postman

Automate and test APIs with Postman, making it easier to understand. Verify quality in service-based architectures
Packt Publishing
14 students enrolled
English [Auto-generated]
Effectively test an API so that you contribute to high-quality software
Rapidly resolve issues in an API using Postman
Create regression tests with Postman for your API that will help your team move ahead with confidence
Save time by not running as many GUI tests using Postman
Explore, visualize, and debug your API during development so that you don’t need to revisit the design later
Future-proof your career by grasping the fundamentals of API testing

Postman is a powerful tool used to test web services and APIs. It allows you to create a request with the required HTTP method and parameters, submit the request, and inspect the results.

This course will use the Postman testing tool to teach you API testing. You will use Postman to find bugs and aid in efficient API development. Create requests and building simple workflows with Postman. Additionally, it will show you how to set up test suites in Postman that can be re-used for regression testing as a project grows.

By the end of this course, you will be able to write automated API tests and have a good grasp of how to test an API. You will know how to use Postman as you work with APIs in various capacities and you will have confidence in your ability to take part in creating high-quality APIs.

About the Author

Dave Westerveld is test developer with many years of testing experience. He has been involved in the testing of many different projects ranging from well-established products to helping with the early stages of major new initiatives. He excels at solving automation problems in a team environment and has been involved in traditional automation initiatives at various stages. Dave has also helped to improve product quality through the creative use of automation tools and by helping build out automation frameworks. He has a desire to see teams efficiently producing high-value software and is enthusiastic about understanding the way that automation tools can be used to help with this goal.

Currently, Dave works as a test developer at D2L, owner of the world’s first integrated learning platform. In this role, he has had the opportunity to learn a lot about services-based architecture and how to test them in the real world. As an employee at an educational company, Dave has a passion for sharing what he has learned with others. He is also passionate about the importance of producing good quality software and so is excited to be able to author courses that allow him to share some of his testing knowledge.

Getting Started with API Testing

The Course Overview

This video will give you an overview about the course.

Understanding Web Services and APIs

Gain a conceptual understanding of what web service is and how you can interact with them via APIs.

  • Explain how to think of web services as a black box function

  • Explain how an API can be thought of as inputs and outputs to the function

  • Show how it works in postman and explain JSON data

Mapping Your APIs

Gain an understand of how to go about figuring out API options.

  • Talk about the sources of information in mapping an API

  • Discuss about strategies that can be used to figure out how an application works

  • Share my journey through this process

Simple Authentication with Postman

Show how to use Postman with Auth bearer tokens.

  • Show how to setup a token in GitHub

  • Observe how to use the token in Postman to authorize delete actions

  • Explore how to use your username and password in Postman to do the same thing

Risks of Using Services and APIs

Understand what things are important to consider when mitigating risk in API testing

  • Talk about risks that are greater in API testing

  • Mention some strategies to mitigate these risks

  • Encourage viewer’s to think this through with their own applications

Hands-On API Testing with Postman

Install and Set Up API Testing Challenges

Get some hands-on API testing challenges installed locally.

  • Get setup on GitHub

  • Clone the testing challenge repo locally

  • Install the testing challenges locally

Testing GET Requests

Learn some of the risk factors and approaches to consider when testing GET calls.

  • Show examples of checking for internal consistency in an API

  • Discuss a few other examples of GET testing

  • Summarize some approach to use in GET testing

Using Parameters in API Calls

Understand different kinds of parameters used in APIs and how to use them in Postman.

  • Show examples of query parameters

  • Explore an example of path parameters

  • Discuss header and request body parameters

Find the Secret: Testing Challenge

Learn how to use the testing challenge to gain real-life experience exploring an API.

  • Show how to start the testing challenge locally

  • Access it from Postman

  • Introduce the challenge to solve

Find the Secret: Testing Challenge – Solution

See how to solve the testing challenge.

  • Give a hint for those that might be stuck

  • Walk through the solution

  • Explain the importance and implication of this

Testing Your API Calls

Testing POST Calls

Understand how to test POST calls in an API.

  • Introduction to considerations in testing POST calls

  • Walk through an example of sending POST calls

  • Show an example of a POST call causing interesting issues

Testing PUT Calls

Understand how to test PUT calls in an API.

  • Discuss some of the considerations specific to PUT calls

  • Show examples of using PUT calls

  • Discuss a possible security issue shown in a PUT call

Testing DELETE Calls

Understand how to test DELETE calls in an API.

  • Explain the importance of testing DELETE calls

  • Show examples of using DELETE calls

  • Summarize the API calls we have covered

Find the 500 Testing Challenge

Introduce a hands-on testing challenge that will use everything covered in the course up until now.

  • Explain the need for all types of API calls

  • Show how to start the challenge

  • Reset the project if things go wrong

Find the 500 Solution

Walk through the solution of the testing challenge.

  • Explain the purpose of this exercise

  • Show the first example of a 500 error

  • Show the second 500 error

Automating API Tests in Postman

Getting Started with Collections in Postman

Understand how to structure and organize test automation so that it is understandable and maintainable.

  • Introduce why this organization is important in test automation

  • Walk through the options that Postman collections have

  • Show an example of setting up a variable

Validating APIs with Postman Requests

Show how to check that an API is returning expected results.

  • Set up a request

  • Add a check on the test tab of the request

  • Demonstrate sharing tests between requests at the collection level

Sharing Code Between Tests in Postman

Teach users about a way that Postman enables, the sharing of code, and variables between various parts of the system.

  • Discuss the importance of sharing repeated items in test automation

  • Show how to share code with environments

  • Share an example of a pre-request script

Mocking with Postman

Gain an understanding of how mocks work and how to use them from within Postman.

  • Demonstrate creating a mock

  • Setup an example for the mock

  • Discuss ways that the mock can be used to help testing

Running Tests Using Newman

Learn how to run Postman from the command line using Newman

  • Walk users through installing Newman

  • Show how to run a collection in Newman

  • Share details about additional options in Newman

Building Quality APIs Using Postman

Debugging Your API

Understand what to do when tests fail.

  • Show example of a failing test

  • Walk through the steps to figure out the issue

  • Explain how the example generalizes to all test failures

Improving API Documentation

Learn why API documentation matters and how it can help with quality. Also learn how to easily create it in Postman.

  • Show how to create an example

  • Use the example as a basis for building documentation

  • Demonstrate using it in the web interface

API Monitoring

Gain knowledge in using monitors to schedule runs in Postman

  • Walk through creating monitor

  • Demonstrate various monitor options

  • Show how to run and manage monitors

Using the Postman API

Understand what the Postman API is and how it can be effectively used

  • Discuss what the Postman API is and what it does

  • Discuss why we might use the Postman API

  • Demonstrate using the API

Advanced Techniques in Postman

Using Postman for Data Driven Testing

Drive many variations of similar tests with data.

  • Explain what data-driven testing is

  • Walk through an example that uses data-driven testing

  • Show running example and discuss the results

Capture API Requests with the Postman Proxy

Use the Postman proxy to directly add API requests captured from network traffic.

  • Show how to setup a proxy on the computer

  • Show how to use that proxy in Postman

  • Walk through an example of using it

Importing Existing API Definitions

Understand how to use predefined schema layouts to quickly import full API definitions into Postman.

  • Explain what swagger/open API definitions are

  • Demonstrate how schema’s fit into this

  • Walk through importing an API directly through an openAPI definition

Using tv4 to Validate API Schema

Understand how to use schema definitions as a form of contract testing.

  • Discuss contract testing and how it fits in with schemas

  • Show how to setup a test using tv4 schema validation

  • Change the definition to demonstrate how it works as a contract


This is a conclusion video.

  • Review the concepts learned

  • Motivate viewers to use the concepts learned to use regularly

You can view and review the lecture materials indefinitely, like an on-demand channel.
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