<?php
  
  namespace tests\unit\models;
  
  use app\models\ContactForm;
  use yii\mail\MessageInterface;
  
  class ContactFormTest extends \Codeception\Test\Unit
  {
      /**
       * @var \UnitTester
       */
      public $tester;
  
      public function testEmailIsSentOnContact()
      {
          $model = new ContactForm();
  
          $model->attributes = [
              'name' => 'Tester',
              'email' => 'tester@example.com',
              'subject' => 'very important letter subject',
              'body' => 'body of current message',
              'verifyCode' => 'testme',
          ];
  
          verify($model->contact('admin@example.com'))->notEmpty();
  
          // using Yii2 module actions to check email was sent
          $this->tester->seeEmailIsSent();
  
          /** @var MessageInterface $emailMessage */
          $emailMessage = $this->tester->grabLastSentEmail();
          verify($emailMessage)->instanceOf('yii\mail\MessageInterface');
          verify($emailMessage->getTo())->arrayHasKey('admin@example.com');
          verify($emailMessage->getFrom())->arrayHasKey('noreply@example.com');
          verify($emailMessage->getReplyTo())->arrayHasKey('tester@example.com');
          verify($emailMessage->getSubject())->equals('very important letter subject');
          verify($emailMessage->toString())->stringContainsString('body of current message');
      }
  }