Mailhog PHPUnit Test Helper

MailTestHelper.php

<?php

use GuzzleHttp\Client;

trait MailTestHelper
{
    /**
     * @var \GuzzleHttp\Client
     */
    protected $client;

    /**
     * Setup guzzle client
     */
    public function setupMailTest()
    {
        $this->$client = (new Client(
            ['base_uri' => 'http://127.0.0.1:8025/api/v1/']
        ));

        $this->clearEmails();
    }

    /**
     * Get all the emails
     *
     * @return array
     */
    public function getAllEmails()
    {
        $content = $this->client->get('messages')->getBody()->getContents();
        
        return json_decode($content, true);
    }

    /**
     * Get last email sent
     *
     * @return array
     */
    public function getLastEmail()
    {
        $lastEmailId = $this->getAllEmails()[0]['ID'];

        $content =  $this->client->get('messages/'.$lastEmailId)->getBody()->getContents();
        
        return json_decode($content, true);
    }

    /**
     * Delete all emails
     *
     * @return mixed
     */
    public function clearEmails()
    {
        return $this->client->delete('messages');
    }

    /**
     * Assert that email body contains the given string
     *
     * @param string $body
     * @param array  $response
     */
    public function assertEmailBodyContains($body, $response)
    {
        $emailBody = $response['Content']['Body'];
        // Get rid of strange equals character than can break your tests
        $emailBody = html_entity_decode(str_replace("=\r\n", "", $emailBody), ENT_QUOTES);

        $this->assertContains($body, $emailBody);
    }

    /**
     * Assert that email subject equals the given string
     *
     * @param string $subject
     * @param array  $response
     */
    public function assertEmailSubjectIs($subject, $response)
    {
        $emailSubject = $response['Content']['Headers']['Subject'];

        $this->assertTrue(
            in_array($subject, $emailSubject)
        );
    }

    /**
     * Assert that the email was send to given recipient
     *
     * @param string $recipient
     * @param array  $response
     */
    public function assertEmailWasSendTo($recipient, $response)
    {
        $emailRecipient = $response['Content']['Headers']['To'];

        $this->assertTrue(
            in_array($recipient, $emailRecipient)
        );
    }
}

Need an update to works with last guzzle version