Assertions on JSON response Code, Body and Headers using Rest Assured

You can assert response code, body and headers for API response using Rest Assured. Check below code:

import org.testng.annotations.BeforeClass;
import org.testng.annotations.Test;
import io.restassured.RestAssured;
import io.restassured.response.Response;
import static org.hamcrest.Matchers.*;
import static io.restassured.RestAssured.given;

public class ReqRes 
{
    String id = "2";
	
    @BeforeClass
    public void setup()
    {
        RestAssured.baseURI = "https://reqres.in/";
        RestAssured.basePath = "api";
    }
	
    @Test(enabled=true)
    public void pathParametersExample()
    {
         given()
             .queryParam("page", "2")
        .when()
            .get("/users/")
        .then()
            .statusCode(200)
            .body("total_pages", equalTo(2))
            .header("server", "cloudflare");
	}
}

In above code .statusCode, Validate that the response status code matches. .body() Validate that the JSON response body conforms to one or more Hamcrest matchers. Here we are validating total_pages are equal to 2 in response. .header() Validate that a response header matches the supplied header name and hamcrest matcher.  Here we are validating server is equal to cloudflare in response heaader.

equalTo() Creates a matcher that matches when the examined object is logically equal to the specified operand. You need to import static org.hamcrest.Matchers.* to use this. In eclipse you manually needs to type import statement because it's a static import.