class UserRequirementsTest

class UserRequirementsTest extends KernelTestBase {
    use UserCreationTrait;
    
    /**
     * {@inheritdoc}
     */
    protected static $modules = [
        'user',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() : void {
        parent::setUp();
        $this->container
            ->get('module_handler')
            ->loadInclude('user', 'install');
        $this->installEntitySchema('user');
    }
    
    /**
     * Tests that the requirements check can detect conflicting user emails.
     *
     * @see \Drupal\Tests\user\Kernel\UserValidationTest::testValidation
     */
    public function testConflictingUserEmails() : void {
        $output = \user_requirements('runtime');
        $this->assertArrayNotHasKey('conflicting emails', $output);
        $this->createUser([], 'User A', FALSE, [
            'mail' => 'unique@example.com',
        ]);
        $this->createUser([], 'User B', FALSE, [
            'mail' => 'UNIQUE@example.com',
        ]);
        $output = \user_requirements('runtime');
        $this->assertArrayHasKey('conflicting emails', $output);
    }
    
    /**
     * Tests that the requirements check does not incorrectly flag blank emails.
     */
    public function testBlankUserEmails() : void {
        $output = \user_requirements('runtime');
        $this->assertArrayNotHasKey('conflicting emails', $output);
        $this->createUser([], 'User A', FALSE, [
            'mail' => '',
        ]);
        $this->createUser([], 'User B', FALSE, [
            'mail' => '',
        ]);
        $output = \user_requirements('runtime');
        $this->assertArrayNotHasKey('conflicting emails', $output);
    }

}