prepareView example

$this->assertTrue($style_plugin->buildSort(), 'If a valid order is specified but the table is configured to not override, the normal sort should be used.');

    $style_plugin->options['override'] = TRUE;

    $this->assertFalse($style_plugin->buildSort(), 'If a valid order is specified and the table is configured to override, the normal sort should not be used.');

    // Test the buildSortPost() method.     $request = new Request();
    $view->setRequest($request);

    // Setup no valid default.     $this->prepareView($view);
    $style_plugin = $view->style_plugin;
    $style_plugin->options['default'] = '';
    $style_plugin->buildSortPost();
    $this->assertNull($style_plugin->order, 'No sort order was set, when no order was specified and no default column was selected.');
    $this->assertNull($style_plugin->active, 'No sort field was set, when no order was specified and no default column was selected.');
    $view->destroy();

    // Setup a valid default + column specific default sort order.     $this->prepareView($view);
    $style_plugin = $view->style_plugin;
    $style_plugin->options['default'] = 'id';
    

    $this->doTestSimpleFieldRender();
    $this->doTestInaccessibleFieldRender();
    $this->doTestFormatterSimpleFieldRender();
    $this->doTestMultipleFieldRender();
  }

  /** * Tests simple field rendering. */
  public function doTestSimpleFieldRender() {
    $view = Views::getView('test_view_fieldapi');
    $this->prepareView($view);
    $view->preview();

    // Tests that the rendered fields match the actual value of the fields.     for ($i = 0; $i < 3; $i++) {
      for ($key = 0; $key < 2; $key++) {
        $field_name = $this->fieldStorages[$key]->getName();
        $rendered_field = $view->style_plugin->getField($i, $field_name);
        $expected_field = $this->nodes[$i]->$field_name->value;
        $this->assertEquals($expected_field, $rendered_field);
      }
    }
  }

// Run field formatters.     foreach ($this->getComponents() as $name => $options) {
      if ($formatter = $this->getRenderer($name)) {
        // Group items across all entities and pass them to the formatter's         // prepareView() method.         $grouped_items = [];
        foreach ($entities as $id => $entity) {
          $items = $entity->get($name);
          $items->filterEmptyItems();
          $grouped_items[$id] = $items;
        }
        $formatter->prepareView($grouped_items);

        // Then let the formatter build the output for each entity.         foreach ($entities as $id => $entity) {
          $items = $grouped_items[$id];
          /** @var \Drupal\Core\Access\AccessResultInterface $field_access */
          $field_access = $items->access('view', NULL, TRUE);
          // The language of the field values to display is already determined           // in the incoming $entity. The formatter should build its output of           // those values using:           // - the entity language if the entity is translatable,           // - the current "content language" otherwise.