+<?php
+
+namespace Drupal\Tests\user\Functional;
+
+use Drupal\Tests\BrowserTestBase;
+
+/**
+ * Tests the create user administration page.
+ *
+ * @group user
+ */
+class UserCreateFailMailTest extends BrowserTestBase {
+
+ /**
+ * Modules to enable
+ *
+ * @var array
+ */
+ public static $modules = ['system_mail_failure_test'];
+
+ /**
+ * Tests the create user administration page.
+ */
+ public function testUserAdd() {
+ $user = $this->drupalCreateUser(['administer users']);
+ $this->drupalLogin($user);
+
+ // Replace the mail functionality with a fake, malfunctioning service.
+ $this->config('system.mail')->set('interface.default', 'test_php_mail_failure')->save();
+ // Create a user, but fail to send an email.
+ $name = $this->randomMachineName();
+ $edit = [
+ 'name' => $name,
+ 'mail' => $this->randomMachineName() . '@example.com',
+ 'pass[pass1]' => $pass = $this->randomString(),
+ 'pass[pass2]' => $pass,
+ 'notify' => TRUE,
+ ];
+ $this->drupalPostForm('admin/people/create', $edit, t('Create new account'));
+
+ $this->assertText(t('Unable to send email. Contact the site administrator if the problem persists.'));
+ $this->assertNoText(t('A welcome message with further instructions has been emailed to the new user @name.', ['@name' => $edit['name']]));
+ }
+
+}