openapi-generator/samples/client/petstore/php/OpenAPIClient-php/tests/DebugTest.php

<?php
namespace OpenAPI\Client;

class DebugTest extends \PHPUnit_Framework_TestCase
{
    public function testEnableDebugOutput()
    {
        $this->expectOutputRegex('#GET /v2/pet/1 HTTP/1.1#');

        $config = new Configuration();
        $config->setDebug(true);
        $api = new Api\PetApi(null, $config);
        $api->getPetById(1);
    }

    public function testEnableDebugOutputAsync()
    {
        $this->expectOutputRegex('#GET /v2/pet/1 HTTP/1.1#');

        $config = new Configuration();
        $config->setDebug(true);
        $api = new Api\PetApi(null, $config);
        $promise = $api->getPetByIdAsync(1);
        $promise->wait();
    }
}