public function testBuildingBaseUrl()
 {
     $http = OpenExchangeRates::getBaseUrl(false);
     $https = OpenExchangeRates::getBaseUrl(true);
     $this->assertTrue(strpos($http, 'http://') !== false);
     $this->assertTrue(strpos($https, 'https://') !== false);
 }
<?php

use EvdB\OpenExchangeRates\OpenExchangeRates;
use EvdB\OpenExchangeRates\Api;
use GuzzleHttp\Client;
include dirname(__DIR__) . '/vendor/autoload.php';
$app_id = $argv[1];
$guzzle = new Client(['base_url' => OpenExchangeRates::getBaseUrl(false)]);
$exchange = new OpenExchangeRates(compact('app_id'), $guzzle);