REST Assured Tutorial 16 – Building RequestSpecification Using RequestSpecBuilder

As a part of the End to End REST Assured Tutorial, in this post, we will learn about class RequestSpecBuilder and how it can be used to create RequestSpecification in Rest Assured.

RequestSpecification – How The Request Will Look Like

Multiple Ways Of Calling HTTP Methods On A RequestSpecification

There is another way of creating RequestSpecification in Rest Assured and that is by using class RequestSpecBuilder.

RequestSpecBuilder is a class in Rest Assured, which contains methods to set cookies, headers, multipart details, body, authentication, form parameters, query parameters, path parameters, base path, base URI, proxy, etc. These all are required to construct a Requestspecification. After adding all required details, we need to use “build()” method of RequestSpecBuilder class to get a RequestSpecification reference.

RequestSpecification helps us to reuse specifications.

package RestAssuredConcepts;

import io.restassured.RestAssured;
import io.restassured.builder.RequestSpecBuilder;
import io.restassured.response.Response;
import io.restassured.specification.RequestSpecification;

public class RequestSpecBuilderExample {

        public static void main(String[] args) {

                // Creating an object of RequestSpecBuilder
                RequestSpecBuilder reqBuilder = new RequestSpecBuilder();
                // Setting Base URI
                reqBuilder.setBaseUri("https://restful-booker.herokuapp.com");
                // Setting Base Path
                reqBuilder.setBasePath("/booking");
                // Getting RequestSpecification reference using builder() method
                RequestSpecification reqSpec = reqBuilder.build();
                
                // Usage in different styles
                // We can directly call http verbs on RequestSpecification
                Response res1= reqSpec.get();
                System.out.println(res1.asString());
                System.out.println("======================");
                
                // We can also pass RequestSpecification reference variable in overloaded given() method
                Response res2 = RestAssured.given(reqSpec).get();
                System.out.println(res2.asString());
                System.out.println("======================");
                                
                // We can also pass RequestSpecification using spec() method
                Response res3 = RestAssured.given().spec(reqSpec).get();
                System.out.println(res3.asString());

        }
}

[{"bookingid":11},{"bookingid":13},{"bookingid":15},{"bookingid":1},{"bookingid":6},{"bookingid":2},{"bookingid":8},{"bookingid":4},{"bookingid":5},{"bookingid":3},{"bookingid":10},{"bookingid":12},{"bookingid":7},{"bookingid":14},{"bookingid":9}]
======================
[{"bookingid":11},{"bookingid":13},{"bookingid":15},{"bookingid":1},{"bookingid":6},{"bookingid":2},{"bookingid":8},{"bookingid":4},{"bookingid":5},{"bookingid":3},{"bookingid":10},{"bookingid":12},{"bookingid":7},{"bookingid":14},{"bookingid":9}]
======================
[{"bookingid":11},{"bookingid":13},{"bookingid":15},{"bookingid":1},{"bookingid":6},{"bookingid":2},{"bookingid":8},{"bookingid":4},{"bookingid":5},{"bookingid":3},{"bookingid":10},{"bookingid":12},{"bookingid":7},{"bookingid":14},{"bookingid":9}]

Note:- You might get an exception “java.lang.NullPointerException: Cannot get property ‘assertionClosure’ on null object” on running above program. There is an existing bug in Rest Assured which is in an open state as of now. You can comment line no 23 and 24 “Response res1= reqSpec.get();” to run program successfully.

You can download/clone the above sample project from here.

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