<code>
package tests;

import org.json.simple.JSONObject;
import org.testng.annotations.Test;

import io.restassured.http.ContentType;

import static io.restassured.RestAssured.*;

public class TestsOnLocalAPI {

    //@Test
    public void get() {

        baseURI = "http://localhost:3000";

        given()
            .get("/users")
        .then()
            .statusCode(200)
            .log().all();

    }

    //@Test
    public void post() {

        JSONObject request = new JSONObject();

        request.put("firstName", "Thomas");
        request.put("lastName", "Edison");
        request.put("subjectId", 1);

        baseURI = "http://localhost:3000";

        given()
            .contentType(ContentType.JSON)
            .accept(ContentType.JSON)
            .body(request.toJSONString())
        .when()
            .post("/users")
        .then()
            .statusCode(201);

    }

    //@Test
    public void put() {

        JSONObject request = new JSONObject();

        request.put("firstName", "Albert");
        request.put("lastName", "Einstein");
        request.put("subjectId", 2);

        baseURI = "http://localhost:3000";

        given()
            .contentType(ContentType.JSON)
            .accept(ContentType.JSON)
            .body(request.toJSONString())
        .when()
            .put("/users/4")
        .then()
            .statusCode(200);

    }

    //@Test
    public void patch() {

        JSONObject request = new JSONObject();

        request.put("lastName", "Doe");

        baseURI = "http://localhost:3000";

        given()
            .contentType(ContentType.JSON)
            .accept(ContentType.JSON)
            .body(request.toJSONString())
        .when()
            .patch("/users/4")
        .then()
            .statusCode(200);

    }

    @Test
    public void delete() {

        baseURI = "http://localhost:3000";

        when()
            .delete("/users/4")
        .then()
            .statusCode(200);

    }

}
</code>