Introduction To The Rest Assured

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In Today Blog We will take a look into Introduction To Rest Assured so without any delay, Let’s Start

What is Rest Assured

  • REST stands for REpresentational State Transfer
  • It is a java library used for testing and validating the Restful Web Services
  • It supports Behavior-Driven Development(BDD) syntax like Given, When, and Then notations
  • It helps us to integrate with testing frameworks like Junit or TestNG

How the Rest Assured Works

  1. Create an HTTP request with all the details
  2. Send the request over the network
  3. Validate the received Response

API Testing With Rest Assured Framework

  • During the development of an application, the RestAssured Framework assists in assessing and identifying errors
  • It is necessary to have knowledge of an IDE, Maven, and frameworks such as TestNG, or JUnit in order to use RestAssured Framework for API Automation Testing
  • The most common way to test REST APIs is with automation, as it helps interpret results more effectively

Rest API uses five HTTP methods for requesting commands as listed below:

  • GET: Retrieves information from a specific URL
  • PUT: Updates previous resources or creates new information at the specified URL
  • PATCH: Partial updates
  • POST: Develops a new entity and used to send information to the server for uploading files or information
  • DELETE: Deletes the present representation at a particular URL


  • REST is open source
  • It authenticates & justifies the response of the requests like “get”, “put”, “patch”, “delete”
  • Firstly, It provides a Given/When/Then test annotation, which immediately makes your tests simple enough to understand
  • It supports CI/CD integration
  • It can used with any customized/open-source reporting tool
  • It can easily integrated with JUnit and TestNG frameworks


  • It requires prerequisite knowledge of the Java programming language
  • It does not support SOAP APIs explicitly
  • It has an inbuilt reporting feature
  • REST Assured is not purely thread-safe


  • The syntax of Rest Assured given below. It follows Behavior Driven Development (BDD)
  • Further, BDD is an approach that defines the behavior of a feature characteristic through instances in plain text

Code Description

  • Given() = ‘Given’ is a keyword that allows you to set a background. You pass the request headers, body, query, path parameters, and cookies
  • When() = ‘When’ is a keyword that tells you the scenario. For example, when a user gets a request like get or post or put something or do something else
  • Method() = Replace this with any of the CRUD operations (get/post/put/delete)
  • Then() = It includes the conditions like assert and matcher

Prerequisites for REST API End to End Test

  1. Java Setup
  2. IDE Setup
  3. Maven Setup
  4. Create a maven project
  5. Add Rest Assured Dependencies
  6. Setup Maven Compiler Plugin
  7. Create a user for the test


  • Rest Assured is a very significant framework to write tests against a REST API
  • Rest Assured is a collection of Java libraries that entitles us to automate Rest API testing
  • Rest Assured is a Java-based concept
  • It helps retrieves values of request and response from complicated JSON structures
  • The API request can be altered with a diversity of header, query, path param, and any session or cookies to be set
  • It helps set assert statements and conditions
  • Rest Assured is very attainable in the condition where the response is JSON type, its methods may not work consistently if the content type is HTML or plain text

So this is blog for covering the Introduction To The Rest Assured.

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I am curious about to learn new technologies. I have good understanding of performance testing concepts.