AssertMailTraitTest.php

<?php

namespace Drupal\KernelTests\Core\Test;

use Drupal\Core\Test\AssertMailTrait;
use Drupal\KernelTests\KernelTestBase;

/**
 * Tests \Drupal\Core\Test\AssertMailTrait works.
 *
 * @group Test
 *
 * @coversDefaultClass \Drupal\Core\Test\AssertMailTrait
 */
class AssertMailTraitTest extends KernelTestBase {
    use AssertMailTrait;
    
    /**
     * Tests that the maintenance theme initializes the theme and its base themes.
     */
    public function testAssertMailTrait() {
        
        /** @var \Drupal\Core\Mail\MailManagerInterface $mail_service */
        $mail_service = \Drupal::service('plugin.manager.mail');
        // Create an email.
        $subject = $this->randomString(64);
        $body = $this->randomString(128);
        $message = [
            'id' => 'drupal_mail_test',
            'headers' => [
                'Content-type' => 'text/html',
            ],
            'subject' => $subject,
            'to' => 'foobar@example.com',
            'body' => $body,
        ];
        // Before we send the email, \Drupal\Core\Test\AssertMailTrait::getMails()
        // should return an empty array.
        $captured_emails = $this->getMails();
        $this->assertCount(0, $captured_emails, 'The captured emails queue is empty.');
        // Send the email.
        $mail_service->getInstance([
            'module' => 'simpletest',
            'key' => 'drupal_mail_test',
        ])
            ->mail($message);
        // Ensure that there is one email in the captured emails array.
        $captured_emails = $this->getMails();
        $this->assertCount(1, $captured_emails, 'One email was captured.');
        // Asserts that the message fields have the pattern in it.
        $this->assertMailPattern('id', $message['id']);
        $this->assertMailPattern('subject', "^.{64}\$");
        $this->assertMailPattern('to', "[a-z]{6}@example\\.com\$");
        $this->assertMailPattern('body', "^.{128}\$");
        // Assert that the email was sent by iterating over the message properties
        // and ensuring that they are captured intact.
        foreach ($message as $field => $value) {
            $this->assertMail($field, $value, "The email was sent and the value for property {$field} is intact.");
        }
        // Send additional emails so more than one email is captured.
        for ($index = 0; $index < 5; $index++) {
            $message = [
                'id' => 'drupal_mail_test_' . $index,
                'headers' => [
                    'Content-type' => 'text/html',
                ],
                'subject' => $this->randomString(64),
                'to' => $this->randomMachineName(32) . '@example.com',
                'body' => $this->randomString(512),
            ];
            $mail_service->getInstance([
                'module' => 'drupal_mail_test',
                'key' => $index,
            ])
                ->mail($message);
        }
        // There should now be 6 emails captured.
        $captured_emails = $this->getMails();
        $this->assertCount(6, $captured_emails, 'All emails were captured.');
        // Test different ways of getting filtered emails via
        // \Drupal\Core\Test\AssertMailTrait::getMails().
        $captured_emails = $this->getMails([
            'id' => 'drupal_mail_test',
        ]);
        $this->assertCount(1, $captured_emails, 'Only one email is returned when filtering by id.');
        $captured_emails = $this->getMails([
            'id' => 'drupal_mail_test',
            'subject' => $subject,
        ]);
        $this->assertCount(1, $captured_emails, 'Only one email is returned when filtering by id and subject.');
        $captured_emails = $this->getMails([
            'id' => 'drupal_mail_test',
            'subject' => $subject,
            'from' => 'this_was_not_used@example.com',
        ]);
        $this->assertCount(0, $captured_emails, 'No emails are returned when querying with an unused from address.');
        // Send the last email again, so we can confirm that
        // \Drupal\Core\Test\AssertMailTrait::getMails() filters correctly returns
        // all emails with a given property/value.
        $mail_service->getInstance([
            'module' => 'drupal_mail_test',
            'key' => $index,
        ])
            ->mail($message);
        $captured_emails = $this->getMails([
            'id' => 'drupal_mail_test_4',
        ]);
        $this->assertCount(2, $captured_emails, 'All emails with the same id are returned when filtering by id.');
    }

}