agent-unit-testing/templates/cakephp/phpunit/MailerTest.template.php

<?php
declare(strict_types=1);

namespace App\Test\TestCase\Mailer;

use App\Mailer\{{MAILER_NAME}}Mailer;
use Cake\TestSuite\EmailTrait;
use Cake\TestSuite\TestCase;

/**
 * App\Mailer\{{MAILER_NAME}}Mailer Test Case
 */
class {{MAILER_NAME}}MailerTest extends TestCase
{
    use EmailTrait;

    /**
     * Test subject
     *
     * @var \App\Mailer\{{MAILER_NAME}}Mailer
     */
    protected {{MAILER_NAME}}Mailer ${{VARIABLE_NAME}};

    /**
     * setUp method
     */
    protected function setUp(): void
    {
        parent::setUp();
        $this->{{VARIABLE_NAME}} = new {{MAILER_NAME}}Mailer();
    }

    /**
     * Test send welcome email
     */
    public function testSendWelcomeEmail(): void
    {
        // Act
        $this->{{VARIABLE_NAME}}->send('welcome', ['user@example.com', 'John Doe']);

        // Assert
        $this->assertMailSentTo('user@example.com');
        $this->assertMailContainsText('John Doe');
    }
}