class CounterTest

class CounterTest extends UnitTestCase {
  
  /**
   * The pager plugin instance.
   *
   * @var \Drupal\views\Plugin\views\pager\PagerPluginBase
   */
  protected $pager;
  
  /**
   * The view executable.
   *
   * @var \Drupal\views\ViewExecutable
   */
  protected $view;
  
  /**
   * The display plugin instance.
   *
   * @var \Drupal\views\Plugin\views\display\DisplayPluginBase
   */
  protected $display;
  
  /**
   * Stores the test data.
   *
   * @var array
   */
  protected $testData = [];
  
  /**
   * The handler definition of the counter field.
   *
   * @var array
   */
  protected $definition;
  
  /**
   * {@inheritdoc}
   */
  protected function setUp() : void {
    parent::setUp();
    // Setup basic stuff like the view and the display.
    $config = [];
    $config['display']['default'] = [
      'id' => 'default',
      'display_plugin' => 'default',
      'display_title' => 'Default',
    ];
    $storage = new View($config, 'view');
    $user = $this->createMock('Drupal\\Core\\Session\\AccountInterface');
    $views_data = $this->getMockBuilder('Drupal\\views\\ViewsData')
      ->disableOriginalConstructor()
      ->getMock();
    $route_provider = $this->createMock('Drupal\\Core\\Routing\\RouteProviderInterface');
    $display_plugin_manager = $this->getMockBuilder('\\Drupal\\views\\Plugin\\ViewsPluginManager')
      ->disableOriginalConstructor()
      ->getMock();
    $this->view = new ViewExecutable($storage, $user, $views_data, $route_provider, $display_plugin_manager);
    $this->display = $this->getMockBuilder('Drupal\\views\\Plugin\\views\\display\\DisplayPluginBase')
      ->disableOriginalConstructor()
      ->getMock();
    $this->pager = $this->getMockBuilder('Drupal\\views\\Plugin\\views\\pager\\Full')
      ->disableOriginalConstructor()
      ->onlyMethods([])
      ->getMock();
    $this->view->display_handler = $this->display;
    $this->view->pager = $this->pager;
    foreach (ViewTestData::dataSet() as $index => $set) {
      $this->testData[] = new ResultRow($set + [
        'index' => $index,
      ]);
    }
    $this->definition = [
      'title' => 'counter field',
      'plugin_type' => 'field',
    ];
  }
  
  /**
   * Provides some row index to test.
   *
   * @return array
   *   Returns an array of row index to test.
   */
  public static function providerRowIndexes() {
    return [
      [
        0,
      ],
      [
        1,
      ],
      [
        2,
      ],
    ];
  }
  
  /**
   * Tests a simple counter field.
   *
   * @dataProvider providerRowIndexes
   */
  public function testSimpleCounter($i) : void {
    $counter_handler = new Counter([], 'counter', $this->definition);
    $options = [];
    $counter_handler->init($this->view, $this->display, $options);
    $this->view->row_index = $i;
    $expected = $i + 1;
    $counter = $counter_handler->getValue($this->testData[$i]);
    $this->assertEquals($expected, $counter, 'The expected number matches with the counter number');
    $counter = $this->renderCounter($counter_handler, $this->testData[$i]);
    $this->assertEquals($expected, $counter, 'The expected number matches with the rendered number');
  }
  
  /**
   * Tests a counter with a random start.
   *
   * @param int $i
   *   The row index to test.
   *
   * @dataProvider providerRowIndexes
   */
  public function testCounterRandomStart($i) : void {
    // Setup a counter field with a random start.
    $rand_start = rand(5, 10);
    $counter_handler = new Counter([], 'counter', $this->definition);
    $options = [
      'counter_start' => $rand_start,
    ];
    $counter_handler->init($this->view, $this->display, $options);
    $this->view->row_index = $i;
    $expected = $rand_start + $i;
    $counter = $counter_handler->getValue($this->testData[$i]);
    $this->assertEquals($expected, $counter, 'The expected number matches with the counter number');
    $counter = $this->renderCounter($counter_handler, $this->testData[$i]);
    $this->assertEquals($expected, $counter, 'The expected number matches with the rendered number');
  }
  
  /**
   * Tests a counter field with a random pager offset.
   *
   * @param int $i
   *   The row index to test.
   *
   * @dataProvider providerRowIndexes
   */
  public function testCounterRandomPagerOffset($i) : void {
    // Setup a counter field with a pager with a random offset.
    $offset = 3;
    $this->pager
      ->setOffset($offset);
    $rand_start = rand(5, 10);
    $counter_handler = new Counter([], 'counter', $this->definition);
    $options = [
      'counter_start' => $rand_start,
    ];
    $counter_handler->init($this->view, $this->display, $options);
    $this->view->row_index = $i;
    $expected = $offset + $rand_start + $i;
    $counter = $counter_handler->getValue($this->testData[$i]);
    $this->assertEquals($expected, $counter, 'The expected number matches with the counter number');
    $counter = $this->renderCounter($counter_handler, $this->testData[$i]);
    $this->assertEquals($expected, $counter, 'The expected number matches with the rendered number');
  }
  
  /**
   * Tests a counter field on the second page.
   *
   * @param int $i
   *   The row index to test.
   *
   * @dataProvider providerRowIndexes
   */
  public function testCounterSecondPage($i) : void {
    $offset = 3;
    // Setup a pager on the second page.
    $this->pager
      ->setOffset($offset);
    $items_per_page = 5;
    $this->pager
      ->setItemsPerPage($items_per_page);
    $current_page = 1;
    $this->pager
      ->setCurrentPage($current_page);
    $rand_start = rand(5, 10);
    $counter_handler = new Counter([], 'counter', $this->definition);
    $options = [
      'counter_start' => $rand_start,
    ];
    $counter_handler->init($this->view, $this->display, $options);
    $this->view->row_index = $i;
    $expected = $items_per_page + $offset + $rand_start + $i;
    $counter = $counter_handler->getValue($this->testData[$i]);
    $this->assertEquals($expected, $counter, 'The expected number matches with the counter number');
    $counter = $this->renderCounter($counter_handler, $this->testData[$i]);
    $this->assertEquals($expected, $counter, 'The expected number matches with the rendered number');
  }
  
  /**
   * Renders the counter field handler.
   *
   * @param \Drupal\views\Plugin\views\field\Counter $handler
   *   The counter handler.
   * @param \Drupal\views\ResultRow $row
   *   A result row.
   *
   * @return string
   *   The counter rendered markup.
   */
  protected function renderCounter(Counter $handler, ResultRow $row) {
    $markup = $handler->render($row);
    $handler->postRender($row, $markup);
    return $handler->last_render;
  }

}