class LinkAccessConstraintValidatorTest

class LinkAccessConstraintValidatorTest extends UnitTestCase {
  
  /**
   * Tests the access validation constraint for links.
   *
   * @covers ::validate
   * @dataProvider providerValidate
   */
  public function testValidate(bool $mayLinkAnyPage, bool $urlAccess, bool $valid) : void {
    // Mock a Url object that returns a boolean indicating user access.
    $url = $this->getMockBuilder('Drupal\\Core\\Url')
      ->disableOriginalConstructor()
      ->getMock();
    if ($mayLinkAnyPage) {
      $url->expects($this->never())
        ->method('access');
    }
    else {
      $url->expects($this->once())
        ->method('access')
        ->willReturn($urlAccess);
    }
    // Mock a link object that returns the URL object.
    $link = $this->createMock('Drupal\\link\\LinkItemInterface');
    $link->expects($this->any())
      ->method('getUrl')
      ->willReturn($url);
    // Mock a user object that returns a boolean indicating user access to all
    // links.
    $user = $this->createMock('Drupal\\Core\\Session\\AccountProxyInterface');
    $user->expects($this->any())
      ->method('hasPermission')
      ->with($this->equalTo('link to any page'))
      ->willReturn($mayLinkAnyPage);
    $context = $this->createMock(ExecutionContextInterface::class);
    if ($valid) {
      $context->expects($this->never())
        ->method('addViolation');
    }
    else {
      $context->expects($this->once())
        ->method('addViolation');
    }
    $constraint = new LinkAccessConstraint();
    $validate = new LinkAccessConstraintValidator($user);
    $validate->initialize($context);
    $validate->validate($link, $constraint);
  }
  
  /**
   * Data provider for LinkAccessConstraintValidator::validate().
   *
   * @return array
   *   An array of tests, matching the parameter inputs for testValidate.
   *
   * @see \Drupal\Tests\link\LinkAccessConstraintValidatorTest::validate()
   */
  public static function providerValidate() : \Generator {
    (yield [
      TRUE,
      TRUE,
      TRUE,
    ]);
    (yield [
      TRUE,
      FALSE,
      TRUE,
    ]);
    (yield [
      FALSE,
      TRUE,
      TRUE,
    ]);
    (yield [
      FALSE,
      FALSE,
      FALSE,
    ]);
  }

}