EditTest.php

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

/**
 * @magentoAppArea adminhtml
 */
class EditTest extends \PHPUnit\Framework\TestCase
{
    /**
     * @var \Magento\User\Block\Role\Tab\Edit
     */
    protected $_block;

    protected function setUp()
    {
        $roleAdmin = \Magento\TestFramework\Helper\Bootstrap::getObjectManager()
            ->create(\Magento\Authorization\Model\Role::class);
        $roleAdmin->load(\Magento\TestFramework\Bootstrap::ADMIN_ROLE_NAME, 'role_name');
        \Magento\TestFramework\Helper\Bootstrap::getObjectManager()->get(
            \Magento\Framework\App\RequestInterface::class
        )->setParam(
            'rid',
            $roleAdmin->getId()
        );

        $this->_block = \Magento\TestFramework\Helper\Bootstrap::getObjectManager()->create(
            \Magento\User\Block\Role\Tab\Edit::class
        );
    }

    public function testConstructor()
    {
        $this->assertNotEmpty($this->_block->getSelectedResources());
        $this->assertContains('Magento_Backend::all', $this->_block->getSelectedResources());
    }

    public function testGetTree()
    {
        $encodedTree = $this->_block->getTree();
        $this->assertNotEmpty($encodedTree);
    }
}