MixerServiceTest.php

<?php

namespace Tests\App\Service;

use PHPUnit\Framework\TestCase;
use Symfony\Contracts\HttpClient\ResponseInterface;
use Symfony\Contracts\HttpClient\HttpClientInterface;

/**
 * Class MixerServiceTest
 * @package Tests\App\Service
 */
class MixerServiceTest extends TestCase
{
    /**
     * Test GetData return array from calling the API
     */
    public function testGetData()
    {
        $httpClientMock = $this->getMockForAbstractClass(HttpClientInterface::class);

        $httpResponseMock = $this->getMockForAbstractClass(ResponseInterface::class);
        $httpResponseMock->method('toArray')->willReturn(['foo' => 'bar']);

        $httpClientMock->method('request')->willReturn($httpResponseMock);

        $mixerService = new \App\Service\MixerService($httpClientMock);
        $data = $mixerService->getData();

        $this->assertEquals($data, ['foo' => 'bar']);
    }
}