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<?php
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
namespace Magento\Backend\Block\Widget;

/**
 * @magentoAppArea adminhtml
 */
class TabsTest extends \PHPUnit\Framework\TestCase
{
    /**
     * @magentoAppIsolation enabled
     */
    public function testAddTab()
    {
        /** @var $widgetInstance \Magento\Widget\Model\Widget\Instance */
        $widgetInstance = \Magento\TestFramework\Helper\Bootstrap::getObjectManager()->create(
            \Magento\Widget\Model\Widget\Instance::class
        );
        /** @var $objectManager \Magento\TestFramework\ObjectManager */
        $objectManager = \Magento\TestFramework\Helper\Bootstrap::getObjectManager();
        $objectManager->get(\Magento\Framework\Registry::class)->register('current_widget_instance', $widgetInstance);

        /** @var $layout \Magento\Framework\View\Layout */
        $layout = \Magento\TestFramework\Helper\Bootstrap::getObjectManager()->get(
            \Magento\Framework\View\LayoutInterface::class
        );
        /** @var $block \Magento\Backend\Block\Widget\Tabs */
        $block = $layout->createBlock(\Magento\Backend\Block\Widget\Tabs::class, 'block');
        $layout->addBlock(\Magento\Widget\Block\Adminhtml\Widget\Instance\Edit\Tab\Main::class, 'child_tab', 'block');
        $block->addTab('tab_id', 'child_tab');

        $this->assertEquals(['tab_id'], $block->getTabsIds());
    }
}