trait OffCanvasTestTrait

trait OffCanvasTestTrait {
    
    /**
     * Waits for the off-canvas area to appear, resized and visible.
     */
    protected function waitForOffCanvasArea() : void {
        // The data-resize-done attribute is added by the off_canvas_test module's
        // wrapper around Drupal.offCanvas.resetSize.
        $this->assertNotEmpty($this->assertSession()
            ->waitForElementVisible('css', '[data-resize-done="true"]'));
        // Remove the data-resize-done attribute so in scenarios where off-canvas
        // opens yet another off-canvas, waitForOffCanvasArea() is looking for the
        // attribute on a new dialog, not an existing one.
        $this->getSession()
            ->executeScript('document.querySelector("[data-resize-done]").removeAttribute("data-resize-done")');
    }

}