GuzzleMockTrait.php

<?php 

namespace Tests;


use GuzzleHttp\Client;
use GuzzleHttp\Exception\BadResponseException;
use GuzzleHttp\Handler\MockHandler;
use GuzzleHttp\HandlerStack;
use GuzzleHttp\Psr7\Response;

trait GuzzleMockTrait
{
    public function guzzleMock($responseData, $status = 200, $contentType = 'application/json')
    {
        $response = is_array($responseData)
            ? new Response($status, ['Content-Type' => $contentType], json_encode($responseData))
            : $responseData
        ;
        $mock = new MockHandler([$response]);
        $handler = HandlerStack::create($mock);

        return new Client(['handler' => $handler]);
    }
}