+<?php
+
+namespace Drupal\Tests\user\Functional;
+
+use Drupal\Tests\BrowserTestBase;
+use Drupal\user\Entity\User;
+
+/**
+ * Tests account saving for arbitrary new uid.
+ *
+ * @group user
+ */
+class UserSaveTest extends BrowserTestBase {
+
+ /**
+ * Test creating a user with arbitrary uid.
+ */
+ public function testUserImport() {
+ // User ID must be a number that is not in the database.
+
+ $uids = \Drupal::entityManager()->getStorage('user')->getQuery()
+ ->sort('uid', 'DESC')
+ ->range(0, 1)
+ ->execute();
+ $max_uid = reset($uids);
+ $test_uid = $max_uid + mt_rand(1000, 1000000);
+ $test_name = $this->randomMachineName();
+
+ // Create the base user, based on drupalCreateUser().
+ $user = User::create([
+ 'name' => $test_name,
+ 'uid' => $test_uid,
+ 'mail' => $test_name . '@example.com',
+ 'pass' => user_password(),
+ 'status' => 1,
+ ]);
+ $user->enforceIsNew();
+ $user->save();
+
+ // Test if created user exists.
+ $user_by_uid = User::load($test_uid);
+ $this->assertTrue($user_by_uid, 'Loading user by uid.');
+
+ $user_by_name = user_load_by_name($test_name);
+ $this->assertTrue($user_by_name, 'Loading user by name.');
+ }
+
+ /**
+ * Ensures that an existing password is unset after the user was saved.
+ */
+ public function testExistingPasswordRemoval() {
+ /** @var \Drupal\user\Entity\User $user */
+ $user = User::create(['name' => $this->randomMachineName()]);
+ $user->save();
+ $user->setExistingPassword('existing password');
+ $this->assertNotNull($user->pass->existing);
+ $user->save();
+ $this->assertNull($user->pass->existing);
+ }
+
+}