class PreprocessPagerTest

class PreprocessPagerTest extends UnitTestCase {
  
  /**
   * {@inheritdoc}
   */
  protected function setUp() : void {
    parent::setUp();
    $pager_manager = $this->getMockBuilder('Drupal\\Core\\Pager\\PagerManager')
      ->disableOriginalConstructor()
      ->getMock();
    $pager = $this->getMockBuilder('Drupal\\Core\\Pager\\Pager')
      ->disableOriginalConstructor()
      ->getMock();
    $url_generator = $this->getMockBuilder('Drupal\\Core\\Routing\\UrlGenerator')
      ->disableOriginalConstructor()
      ->getMock();
    $pager->method('getTotalPages')
      ->willReturn(2);
    $pager->method('getCurrentPage')
      ->willReturn(1);
    $url_generator->method('generateFromRoute')
      ->willReturn('');
    $pager_manager->method('getPager')
      ->willReturn($pager);
    $pager_manager->method('getUpdatedParameters')
      ->willReturn('');
    $container = new ContainerBuilder();
    $container->set('pager.manager', $pager_manager);
    $container->set('url_generator', $url_generator);
    // template_preprocess_pager() renders translatable attribute values.
    $container->set('string_translation', $this->getStringTranslationStub());
    \Drupal::setContainer($container);
  }
  
  /**
   * Tests template_preprocess_pager() when an empty #quantity is passed.
   *
   * @covers ::template_preprocess_pager
   */
  public function testQuantityNotSet() : void {
    require_once $this->root . '/core/includes/theme.inc';
    $variables = [
      'pager' => [
        '#element' => '',
        '#parameters' => [],
        '#quantity' => '',
        '#route_name' => '',
        '#tags' => '',
      ],
    ];
    template_preprocess_pager($variables);
    $this->assertEquals([
      'first',
      'previous',
    ], array_keys($variables['items']));
  }
  
  /**
   * Tests template_preprocess_pager() when a #quantity value is passed.
   *
   * @covers ::template_preprocess_pager
   */
  public function testQuantitySet() : void {
    require_once $this->root . '/core/includes/theme.inc';
    $variables = [
      'pager' => [
        '#element' => '2',
        '#parameters' => [],
        '#quantity' => '2',
        '#route_name' => '',
        '#tags' => '',
      ],
    ];
    template_preprocess_pager($variables);
    $this->assertEquals([
      'first',
      'previous',
      'pages',
    ], array_keys($variables['items']));
    /** @var \Drupal\Core\Template\AttributeString $attribute */
    $attribute = $variables['items']['pages']['2']['attributes']->offsetGet('aria-current');
    $this->assertInstanceOf(AttributeString::class, $attribute);
    $this->assertEquals('page', $attribute->value());
  }
  
  /**
   * Tests template_preprocess_pager() when an empty #pagination_heading_level value is passed.
   *
   * @covers ::template_preprocess_pager
   */
  public function testEmptyPaginationHeadingLevelSet() : void {
    require_once $this->root . '/core/includes/theme.inc';
    $variables = [
      'pager' => [
        '#element' => '2',
        '#pagination_heading_level' => '',
        '#parameters' => [],
        '#quantity' => '2',
        '#route_name' => '',
        '#tags' => '',
      ],
    ];
    template_preprocess_pager($variables);
    $this->assertEquals('h4', $variables['pagination_heading_level']);
  }
  
  /**
   * Tests template_preprocess_pager() when no #pagination_heading_level is passed.
   *
   * @covers ::template_preprocess_pager
   */
  public function testPaginationHeadingLevelNotSet() : void {
    require_once $this->root . '/core/includes/theme.inc';
    $variables = [
      'pager' => [
        '#element' => '',
        '#parameters' => [],
        '#quantity' => '',
        '#route_name' => '',
        '#tags' => '',
      ],
    ];
    template_preprocess_pager($variables);
    $this->assertEquals('h4', $variables['pagination_heading_level']);
  }
  
  /**
   * Tests template_preprocess_pager() when a #pagination_heading_level value is passed.
   *
   * @covers ::template_preprocess_pager
   */
  public function testPaginationHeadingLevelSet() : void {
    require_once $this->root . '/core/includes/theme.inc';
    $variables = [
      'pager' => [
        '#element' => '2',
        '#pagination_heading_level' => 'h5',
        '#parameters' => [],
        '#quantity' => '2',
        '#route_name' => '',
        '#tags' => '',
      ],
    ];
    template_preprocess_pager($variables);
    $this->assertEquals('h5', $variables['pagination_heading_level']);
  }
  
  /**
   * Test template_preprocess_pager() with an invalid #pagination_heading_level.
   *
   * @covers ::template_preprocess_pager
   */
  public function testPaginationHeadingLevelInvalid() : void {
    require_once $this->root . '/core/includes/theme.inc';
    $variables = [
      'pager' => [
        '#element' => '2',
        '#pagination_heading_level' => 'not-a-heading-element',
        '#parameters' => [],
        '#quantity' => '2',
        '#route_name' => '',
        '#tags' => '',
      ],
    ];
    template_preprocess_pager($variables);
    $this->assertEquals('h4', $variables['pagination_heading_level']);
  }

}