public class QueryEndpoint {

    @BeforeClass
    public static void setup() {

        String username = "username111";
        String password = "password222";
        StringBuilder authorization = new StringBuilder();
        authorization.append(username).append(":").append(password);
        String authHeader = "Basic " + Base64.getEncoder().encodeToString(authorization.toString().getBytes());
    }

package com.example.tests;

import com.jayway.restassured.authentication.PreemptiveBasicAuthScheme;
import com.example.misc.QueryEndpoint;

public class ApiTest extends QueryEndpoint {

    @Test
    public void verifyTopLevelURL() {
        given()
                .header("Authorization", authScheme) // <--HERE
                .contentType("application/json")
                .when().get("/22222222").then()
                .body("fruit",equalTo("22222222"))
                .body("fruit.apple",equalTo(37))
                .body("fruit.banana",equalTo("111"))
                .statusCode(200);
    }
}