Learning Materials

How to Automate REST Api With Rest Assured?

Vishnupriya #QA Automation, #Selenium Automation, #REST API Testing, #Postman, #Rest Assured

Nowadays, all applications are driven by service calls. API calls are part of application development, so API testing plays a vital role in Tester's world. It saves tremendous time in developers and testers world when API call validity is checked and analyzed for all possible scenarios ahead of time. API testing can be achieved manually or automated. Automated API testing allows for possible scenario based testing.

In a wide variety of tools available in the market place, we are discussing open source tool for integration testing. Manual API testing can be performed by Postman tool and the automation can be performed with REST Assured. REST assured is a java-based library to test RESTful API services which is powerful, easy to script and maintain the code base. It helps us to validate status code, status message, headers and body of the response. With that information, we can create test case scenarios for various user behaviors of our application.

Scenario based testing is very popular for user experience testing. REST Assured is perfect for user experience testing, user flow testing and integration testing. The typical approach for testing:

Rest API
Install
  • REST Assured is a java-based library, not a standalone tool.
  • Include the library in your IDE and create a Java project.
Validate
  • Test API manually in Postman tool for better understanding of Request parameters, methods, operations (CRUD) and corresponding responses.
Plan
  • Test case Scenarios with possible test data and expected response output.
  • A simple scenario would be – Send a network request to server, get a response back, and compare it against a predetermined result.
  • Advanced Scenarios would be: Send a request with parameters for conditions with when, then, and what if scenarios, get a response back, compare results against the expected output and create a report.
Write
  • Write automation scripts for each scenario.
  • Prepare Test Data - Request parameters as a test data with header information.
  • Prepare Expected Output.
  • Test HTTP Error Codes.
  • Compare Response Results for the expected behavior.
  • Reuse the data from a previous API call to next scenario for complete flow testing.
Run and Report
  • Run scripts and analyze output.
  • Share Reports with developers.
About Author
  • vishnupriya

    Vishnupriya works as a Senior Test Automation Engineer with Vconnex Services, Inc and has more than 4 years of IT experience in Software Automation QA Engineer using Selenium WebDriver. She has sound testing knowledge in Rest API testing, Web & Mobile App (Android & iOS) testing, GUI, Functional, Integration, Usability, Smoke, Regression and Retesting. She has experience in writing data migration scripts and manage data extraction projects in Healthcare domain. She has extensive experience in using Selenium IDE, WebDriver and open source automation Testing Tools.

QA Automation Selenium Automation REST API Testing Postman Rest Assured