How to incorporate TestNG assertions in validating Response in Rest Assured?

We can incorporate TestNG assertions in validating Response in Rest Assured. To work with TestNG we have to add the below dependency in the pom.xml in our Maven project. The link to this dependency is available in the below link −

https://mvnrepository.com/artifact/org.testng/testng

To verify a response with a TestNG assertion, we need to use the methods of the Assert class. We shall first send a GET request via Postman on a mock API URL and go through the response.

Example

Using Rest Assured and TestNG, we shall verify the value of the Course field which is Automation Testing.

Code Implementation

import org.testng.Assert;
import org.testng.annotations.Test;
import static io.restassured.RestAssured.*;
import io.restassured.RestAssured;
import io.restassured.path.json.JsonPath;
import io.restassured.response.Response;
import io.restassured.response.ResponseBody;
import io.restassured.specification.RequestSpecification;
public class NewTest {
   @Test
   void verifyTestNg() {
      String c = "Automation Testing";

      //base URI with Rest Assured class
      RestAssured.baseURI = "https://run.mocky.io/v3";

      //input details
      RequestSpecification h = RestAssured.given();

      //get response
      Response r = h.get("/e3f5da9c-6692-48c5-8dfe-9c3348cfd5c7");

      //Response body
      ResponseBody bdy = r.getBody();

      //convert response body to string
      String b = bdy.asString();

      //JSON Representation from Response Body
      JsonPath j = r.jsonPath();

      //Get value of Location Key
      String l = j.get("Course");
      System.out.println("Course name: " + l);
      Assert.assertEquals(l, c);
   }
}

Output