RestAssured Java

package Restassured;

import io.restassured.RestAssured;
import io.restassured.response.ValidatableResponse;
import org.junit.Test;
import org.junit.experimental.categories.Category;

import static io.restassured.RestAssured.given;
import static io.restassured.config.XmlConfig.xmlConfig;
import static io.restassured.http.ContentType.JSON;
import static io.restassured.http.ContentType.XML;
import static org.hamcrest.CoreMatchers.*;
import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.Matchers.hasSize;
import static org.hamcrest.xml.HasXPath.hasXPath;

interface  IntegrationTest {}

public class RestAssuredTest {

    @Test
    @Category(IntegrationTest.class)
    public void makeSureThatGoogleIsUp() {
        given().when().get("http://www.google.com").then().statusCode(200);
    }

    @Test
    @Category(IntegrationTest.class)
    public void jsonEchoTest() {
        //https://jsonplaceholder.typicode.com

        given().
        when().get("https://jsonplaceholder.typicode.com/users").
        then().assertThat()
                .contentType(JSON)
                .body("username[0]",equalTo("Bret"))
                .body("email[0]",equalTo("Sincere@april.biz"))
                .statusCode(200);
    }

    @Test
    @Category(IntegrationTest.class)
    public void jsonSizeCheckTest() {
        //https://jsonplaceholder.typicode.com/posts

        ValidatableResponse response = given()
                .when().get("https://jsonplaceholder.typicode.com/posts")
                .then().assertThat()
                .contentType(JSON)
                .statusCode(200);

        assertThat(response.extract().jsonPath().getList("$").size(), equalTo(100));

    }

}