class StyleGridTest

class StyleGridTest extends PluginKernelTestBase {
    
    /**
     * Views used by this test.
     *
     * @var array
     */
    public static $testViews = [
        'test_grid',
    ];
    
    /**
     * Keeps track of which alignments have been tested.
     *
     * @var array
     */
    protected $alignmentsTested = [];
    
    /**
     * Tests the grid style.
     */
    public function testGrid() : void {
        $view = Views::getView('test_grid');
        foreach ([
            'horizontal',
            'vertical',
        ] as $alignment) {
            $this->assertGrid($view, $alignment, 5);
            $this->assertGrid($view, $alignment, 4);
            $this->assertGrid($view, $alignment, 3);
            $this->assertGrid($view, $alignment, 2);
            $this->assertGrid($view, $alignment, 1);
        }
    }
    
    /**
     * Generates a grid and asserts that it is displaying correctly.
     *
     * @param \Drupal\views\ViewExecutable $view
     *   The executable to prepare.
     * @param string $alignment
     *   The alignment of the grid to test.
     * @param int $columns
     *   The number of columns in the grid to test.
     *
     * @internal
     */
    protected function assertGrid(ViewExecutable $view, string $alignment, int $columns) : void {
        $view->setDisplay('default');
        $view->initStyle();
        $view->initHandlers();
        $view->initQuery();
        $view->style_plugin->options['alignment'] = $alignment;
        $view->style_plugin->options['columns'] = $columns;
        $this->executeView($view);
        $output = $view->preview();
        $output = \Drupal::service('renderer')->renderRoot($output);
        $this->setRawContent($output);
        if (!in_array($alignment, $this->alignmentsTested)) {
            $result = $this->xpath('//div[contains(@class, "views-view-grid") and contains(@class, :alignment) and contains(@class, :columns)]', [
                ':alignment' => $alignment,
                ':columns' => 'cols-' . $columns,
            ]);
            $this->assertGreaterThan(0, count($result), ucfirst($alignment) . " grid markup detected.");
            $this->alignmentsTested[] = $alignment;
        }
        $width = '0';
        switch ($columns) {
            case 5:
                $width = '20';
                break;
            case 4:
                $width = '25';
                break;
            case 3:
                $width = '33.3333';
                break;
            case 2:
                $width = '50';
                break;
            case 1:
                $width = '100';
                break;
        }
        // Ensure last column exists.
        $result = $this->xpath('//div[contains(@class, "views-col") and contains(@class, :columns) and starts-with(@style, :width)]', [
            ':columns' => 'col-' . $columns,
            ':width' => 'width: ' . $width,
        ]);
        $this->assertGreaterThan(0, count($result), ucfirst($alignment) . " {$columns} column grid: last column exists and automatic width calculated correctly.");
        // Ensure no extra columns were generated.
        $result = $this->xpath('//div[contains(@class, "views-col") and contains(@class, :columns)]', [
            ':columns' => 'col-' . ($columns + 1),
        ]);
        $this->assertEmpty($result, ucfirst($alignment) . " {$columns} column grid: no extraneous columns exist.");
        // Ensure tokens are being replaced in custom row/column classes.
        $result = $this->xpath('//div[contains(@class, "views-col") and contains(@class, "name-John")]');
        $this->assertGreaterThan(0, count($result), ucfirst($alignment) . " {$columns} column grid: Token replacement verified in custom column classes.");
        $result = $this->xpath('//div[contains(@class, "views-row") and contains(@class, "age-25")]');
        $this->assertGreaterThan(0, count($result), ucfirst($alignment) . " {$columns} column grid: Token replacement verified in custom row classes.");
    }

}