class ViewTestBase

abstract class ViewTestBase extends BrowserTestBase {
    use ViewResultAssertionTrait;
    
    /**
     * Modules to enable.
     *
     * @var array
     */
    protected static $modules = [
        'views',
        'views_test_config',
    ];
    
    /**
     * Sets up the test.
     *
     * @param bool $import_test_views
     *   Should the views specified on the test class be imported. If you need
     *   to setup some additional stuff, like fields, you need to call false and
     *   then call createTestViews for your own.
     * @param array $modules
     *   The module directories to look in for test views.
     */
    protected function setUp($import_test_views = TRUE, $modules = [
        'views_test_config',
    ]) {
        parent::setUp();
        if ($import_test_views) {
            ViewTestData::createTestViews(static::class, $modules);
        }
    }
    
    /**
     * Sets up the views_test_data.module.
     *
     * Because the schema of views_test_data.module is dependent on the test
     * using it, it cannot be enabled normally.
     */
    protected function enableViewsTestModule() {
        // Define the schema and views data variable before enabling the test module.
        \Drupal::state()->set('views_test_data_schema', $this->schemaDefinition());
        \Drupal::state()->set('views_test_data_views_data', $this->viewsData());
        \Drupal::service('module_installer')->install([
            'views_test_data',
        ]);
        $this->resetAll();
        $this->rebuildContainer();
        $this->container
            ->get('module_handler')
            ->reload();
        // Load the test dataset.
        $data_set = $this->dataSet();
        $query = Database::getConnection()->insert('views_test_data')
            ->fields(array_keys($data_set[0]));
        foreach ($data_set as $record) {
            $query->values($record);
        }
        $query->execute();
    }
    
    /**
     * Orders a nested array containing a result set based on a given column.
     *
     * @param array $result_set
     *   An array of rows from a result set, with each row as an associative
     *   array keyed by column name.
     * @param string $column
     *   The column name by which to sort the result set.
     * @param bool $reverse
     *   (optional) Boolean indicating whether to sort the result set in reverse
     *   order. Defaults to FALSE.
     *
     * @return array
     *   The sorted result set.
     */
    protected function orderResultSet($result_set, $column, $reverse = FALSE) {
        $order = $reverse ? -1 : 1;
        usort($result_set, function ($a, $b) use ($column, $order) {
            return $order * ($a[$column] <=> $b[$column]);
        });
        return $result_set;
    }
    
    /**
     * Asserts the existence of a button with a certain ID and label.
     *
     * @param string $id
     *   The HTML ID of the button
     * @param string $expected_label
     *   The expected label for the button.
     * @param string $message
     *   (optional) A custom message to display with the assertion. If no custom
     *   message is provided, the message will indicate the button label.
     *
     * @throws \Behat\Mink\Exception\ElementNotFoundException
     */
    protected function helperButtonHasLabel($id, $expected_label, $message = 'Label has the expected value: %label.') {
        $xpath = $this->assertSession()
            ->buildXPathQuery('//button[@id=:value]|//input[@id=:value]', [
            ':value' => $id,
        ]);
        $field = $this->getSession()
            ->getPage()
            ->find('xpath', $xpath);
        if (empty($field)) {
            throw new ElementNotFoundException($this->getSession()
                ->getDriver(), 'form field', 'id', $field);
        }
        $this->assertEquals($expected_label, $field->getValue());
    }
    
    /**
     * Executes a view.
     *
     * @param \Drupal\views\ViewExecutable $view
     *   The view object.
     * @param array $args
     *   (optional) An array of the view arguments to use for the view.
     */
    protected function executeView(ViewExecutable $view, $args = []) {
        // A view does not really work outside of a request scope, due to many
        // dependencies like the current user.
        $view->setDisplay();
        $view->preExecute($args);
        $view->execute();
    }
    
    /**
     * Returns the schema definition.
     *
     * @internal
     */
    protected function schemaDefinition() {
        return ViewTestData::schemaDefinition();
    }
    
    /**
     * Returns the views data definition.
     */
    protected function viewsData() {
        return ViewTestData::viewsData();
    }
    
    /**
     * Returns a very simple test dataset.
     */
    protected function dataSet() {
        return ViewTestData::dataSet();
    }

}