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<?php

declare(strict_types=1);

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(): void {
    /** @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.');
  }

}