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Rest Assured Interview Questions

Planning on becoming a Rest Assured professional? With the increasing demand for the role, the interviews have gotten tougher to crack, however, with the help of professionals we have curated important questions that will surely help you get the dream job role you always dreamt of.

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Representational State Transfer is the abbreviation for REST. A Java package called REST Assured is used to test and validate Restful Web Services. It supports given, when, and then notations, which are part of behavior-driven development (BDD). It facilitates our integration with test frameworks like TestNG and Junit.

Let's see how Rest Assured operates.

  • Make a Request to the server with all the information.
  • Message the network with the request
  • Verify the response you have got

Before we start the interview questions, we have divided these into 3 categories for a better and easy understanding. They are

Top 10 Rest Assured Interview Questions

  1. What protocol is utilized by RESTful Web Services?
  2. Explain REST Assured method chaining
  3. Name the essential elements of an HTTP response.
  4. Describe the Rest Assured request specification and response.
  5. What is a RESTFul Web service's payload?
  6. What technique does caching use?
  7. What is Client-server architecture?
  8. Describe JSON.
  9. What procedures and techniques are used to verify the REST API response in Rest Assured?
  10. What do the Java terms serialization and deserialization mean?

Top Rest Assured Interview Questions for Freshers

1. Describe REST Assured in detail.

With the help of the Java package REST Assured, developers can create robust, maintainable tests for RESTful APIs. It is frequently employed to test XML- and JSON-based web applications. Also supported are all methods, such as GET,, DELETE, PATCH, POST, and PUT.

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2. Describe REST.

Representational state transfer, sometimes known as REST, is an architectural style or design pattern for APIs. A RESTful web service discloses resource information about itself.

Related Article: Rest Assured Tutorial

3. What exactly is JSON?

It is a message standard that describes structured data that is based on the object syntax of JavaScript. In web applications, JSON is often used to convey data to client and the server.

4. What protocol is utilized by RESTful Web Services?

The HTTP protocol is used by RESTful web services to transmit data between both the server and the client.

5. What exactly is "client-server architecture"?

How a server distributes services and resources to one or more clients is outlined in the client-server architecture model. Mail servers, data centers and Web servers are a few instances of servers. Therefore, when a client requests a resource, the server fulfills the request.

Client Server Architecture

6. RESTfully define a resource.

Any material is treated as a resource in the REST framework. This material consists of dynamic business information, HTML pages, text files, photos, and videos. These resources are accessible to users through a REST server, which can also modify them. Each resource is identified by a unique URI or global IDEST

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7. Explain REST Assured method chaining

Method chaining is a common syntax for calling any number of methods in the setting of object-oriented programming languages. Every function compares an object, allowing for the chaining of several calls in a single line. This trait implies that variables are not required to maintain interim outcomes.

8. Why would a programmer choose REST Assured over Postman to automate RESTful services?

Postman cannot accomplish this since REST Assured has the ability to customize reports. Additionally, REST Assured Java client allows code reuse, whereas Postman does not. Finally, Postman has a limit of one data file, whereas REST Assured has no constraints on data file submissions for collections.

9. What are the details of the request?

In REST Assured, request specifications are used to group similar request specifications and transform them into a specific object. The base URL, header, baseline path, as well as other parameters can all be defined using this interface. To get a connection for the Request specification, you must utilize the provided() feature of the REST Assured class.

10. How does REST Assured start a request specification?


RequestSpecification reqSpec = RestAssured.given();

Top Rest Assured Interview Questions for Experienced

11. How is chaining carried out in REST Assured?

Method chaining is a technique used in object-oriented programming languages to call numerous methods at once. Each function compares an object, enabling the chaining of calls into a single phrase without the need for variables to store intermediate results.

12. Create a piece of code that uses REST Assured to test REST API.

import org.testng.annotations.Test;
import io.restassured.RestAssured;
import io.restassured.http.Method;
import io.restassured.response.Response;
import io.restassured.specification.RequestSpecification;
public class EmployeesTest
    public void GetAllEmoloyees()
           // base URL to call
           RestAssured.baseURI = "http://localhost:8080/employees/get"; 
           //Provide HTTP method type - GET, and URL to get all employees
           //This will give response
           Response employ eesResponse = RestAssured.given().request(Method.GET, "/all"); 
           // Print the response in string format
Related Article: REST API Tutorial

13. Within the framework of REST Assured, what does a JSON path mean?

Without using XPath, it is simple to retrieve values from an Object document using a JsonPath. In order to obtain an object from a document, it adheres to the Groovy XPath syntax. Think of it as a JSON-specific implementation of XPath.

14. What is a static import, and why would REST Assured utilize one?

A feature of the Java programming language called static import enables the use of members such as fields and methods zoomed as public static inside their container class without naming the field's defining class.

15. In the context of Java, what do serialization and deserialization mean?

The process of converting an organism's state into a stream of bytes is known as serialization. Deserialization, in contrast, hand, is the procedure that uses a byte stream to recreate the Java class in memory. The item is kept alive using this strategy.

Serialisation And Deserialization In Java

16. Name the essential elements of an HTTP response.

There are five components to an HTTP request

  • event such as DELETE, GET, and POST. This component displays the HTTP method.
  • A unique resource identification number (URI). The service on the server is identified by this element.
  • The version over HTTP.
  • An application header The information for the message is contained in this element. The message body format, client or browser type, cache settings, and other factors could all be included in the metadata.
  • Message body

17. Can a GET query be made in place of a PUT to create a resource?

Because GET has view-only rights, use it. A resource should never be created using the POST and PUT methods.

18. What distinguishes path parameters from query parameters, and how do you use them?

While query parameters are employed to sort/filter resources, path parameters are used to adding relevant on the server. Path parameters occur before the question mark in the URL, while query parameters follow it and look like key-value pairs.

19. Describe the Rest Assured request specification and response.

Rest certain that both the Request Specification and the Response are interfaces. Request specification allows for the specification of the request's appearance. Methods for defining base URL, base paths, headers, bodies, etc. are available in the Request Specification Interface. When returning a response to a request, the Response interface extends the ResponseBody and ResponseOptions interfaces.

20. URI: What is it? What is the primary function of REST-based web services, and how are they structured?

Uniform Resource Identifier is what URI stands for. It is a group of characters created for the URI scheme's extensibility and clear resource identification. A URI's function is to identify a resource or resources on the server that hosts the web service.

Frequently Asked Rest Assured Interview Questions

21. What is a RESTFul Web service's payload?

The information you want to send over is called the "payload." This is distinct from components like HTTP/S Request/Response headers, authentication, etc. that package data for transport.

22. What is the maximum payload size that can be sent using the POST method?

The service URL is updated by the GET command. However, it shouldn't be larger than allowed by the URL length. However, there is no such restriction for POST.

23. What technique does caching use?

Simply said, caching is the act of temporarily storing information and either deliberately or implicitly retrieving it from a high-performance repository, typically memory. By keeping a copy of the object you ordered and later retrieving the cached copy rather than the original, a caching mechanism can speed up delivery.

24. Why does Rest Assured use static import?

A feature of the Java programming language called static import enables the use of members such as fields and methods that were scoped as public static in their container class without naming the class in which they were defined.

25. What is Client-server architecture?

A server provides services and resources to one or even more clients in accordance with the client-server model. Examples of servers include mail servers, file servers, and web servers. As a result, the Client makes a request, and the Server grants it.

26. Describe REST.

The term "REpresentational State Transfer" is referred to by its acronym. It implies that the server will convey to the client a depiction of the condition of the particular request whenever a RESTful API is called. The HTTP method you use to specify the action you wish the server to do on that resource.

27. Describe JSON.

Based on JavaScript object syntax, JSON or JavaScript Object Notation is a text-based standard for representing organized data. To communicate data to the server and client, it is frequently used in web applications.

JSON or JavaScript Object Syntax

Related Article: JSON Interview Questions

28. What procedures and techniques are used to verify the REST API response in Rest Assured?

The response is an interface that is part of the io.restassured.response package. It has a lot of methods that can be used to extract different parts from the received response.

29. What is the best way to ensure that private information isn't included in the login process?

In REST Assured 4.2.0, it is now possible to blacklist headers using the blacklistHeader method, preventing their visibility in the request or reply log. It is possible to blacklist one or more headers. Sensitive information is kept out of the log using a blacklist.

30. What do the Java terms serialization and deserialization mean?

The process of serialization involves transforming an object's state into a stream of bytes. Deserialization is the act of using a byte stream to recreate the real Java object in memory. This method maintains the object's life.

Key Upshots

Because Java is one of the most widely used programming languages in the IT sector, there is consistently a strong need for Java programmers. Java is the most widely used programming language in software development. Rest assured is a widely used language of java that is known to have a great demand in the market. Therefore, the opportunities as a professional are quite tempting too.

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Last updated: 04 Apr 2023
About Author


Madhuri is a Senior Content Creator at MindMajix. She has written about a range of different topics on various technologies, which include, Splunk, Tensorflow, Selenium, and CEH. She spends most of her time researching on technology, and startups. Connect with her via LinkedIn and Twitter .

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