Adminhtml.php

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<?php
namespace Magento\Framework\TestFramework\Unit\Block;

class Adminhtml extends \PHPUnit\Framework\TestCase
{
    protected $_designMock;

    protected $_sessionMock;

    protected $_sidResolver;

    protected $_translatorMock;

    protected $_layoutMock;

    protected $_requestMock;

    protected $_messagesMock;

    protected $_urlMock;

    protected $_eventManagerMock;

    protected $_controllerMock;

    protected $_context;

    protected $_loggerMock;

    protected $_filesystemMock;

    protected $_cacheMock;

    protected $_scopeConfigMock;

    protected $_storeManagerMock;

    protected $_mathMock;

    protected $_formKey;

    protected function setUp()
    {
        // These mocks are accessed via context
        $this->_designMock          = $this->_makeMock(\Magento\Framework\View\DesignInterface::class);
        $this->_sessionMock         = $this->_makeMock(\Magento\Framework\Session\Generic::class);
        $this->_sidResolver         = $this->_makeMock(\Magento\Framework\Session\SidResolver::class);
        $this->_translatorMock      = $this->_makeMock(\Magento\Framework\TranslateInterface::class);
        $this->_layoutMock          = $this->_makeMock(\Magento\Framework\View\Layout::class);
        $this->_requestMock         = $this->_makeMock(\Magento\Framework\App\RequestInterface::class);
        $this->_messagesMock        = $this->_makeMock(\Magento\Framework\View\Element\Messages::class);
        $this->_urlMock             = $this->_makeMock(\Magento\Framework\UrlInterface::class);
        $this->_eventManagerMock    = $this->_makeMock(\Magento\Framework\Event\ManagerInterface::class);
        $this->_controllerMock      = $this->_makeMock(\Magento\Framework\App\FrontController::class);
        $this->_loggerMock          = $this->_makeMock(\Psr\Log\LoggerInterface::class);
        $this->_filesystemMock      = $this->_makeMock(\Magento\Framework\Filesystem::class);
        $this->_cacheMock           = $this->_makeMock(\Magento\Framework\App\CacheInterface::class);
        $this->_scopeConfigMock     = $this->_makeMock(\Magento\Framework\App\Config\ScopeConfigInterface::class);
        $this->_storeManagerMock    = $this->_makeMock(\Magento\Store\Model\StoreManager::class);
        $assetRepoMock              = $this->_makeMock(\Magento\Framework\View\Asset\Repository::class);
        $viewConfigMock             = $this->_makeMock(\Magento\Framework\View\ConfigInterface::class);
        $viewFileSystemMock         = $this->_makeMock(\Magento\Framework\View\FileSystem::class);
        $templatePoolMock           = $this->_makeMock(\Magento\Framework\View\TemplateEnginePool::class);
        $authorizationMock          = $this->_makeMock(\Magento\Framework\AuthorizationInterface::class);
        $cacheStateMock             = $this->_makeMock(\Magento\Framework\App\Cache\StateInterface::class);
        $escaperMock                = $this->_makeMock(\Magento\Framework\Escaper::class);
        $filterManagerMock          = $this->_makeMock(\Magento\Framework\Filter\FilterManager::class);
        $backendSessionMock         = $this->_makeMock(\Magento\Backend\Model\Session::class);
        $appState                   = $this->_makeMock(\Magento\Framework\App\State::class);
        $this->_mathMock            = $this->_makeMock(\Magento\Framework\Math\Random::class);
        $this->_formKey             = $this->_makeMock(\Magento\Framework\Data\Form\FormKey::class);

        $appState->setAreaCode(\Magento\Backend\App\Area\FrontNameResolver::AREA_CODE);

        $this->_translatorMock->expects(
            $this->any()
        )->method(
            'translate'
        )->will(
            $this->returnCallback([$this, 'translateCallback'])
        );

        $this->_context = new \Magento\Backend\Block\Template\Context(
            $this->_requestMock,
            $this->_layoutMock,
            $this->_eventManagerMock,
            $this->_urlMock,
            $this->_translatorMock,
            $this->_cacheMock,
            $this->_designMock,
            $this->_sessionMock,
            $this->_sidResolver,
            $this->_scopeConfigMock,
            $this->_controllerMock,
            $assetRepoMock,
            $viewConfigMock,
            $cacheStateMock,
            $this->_loggerMock,
            $escaperMock,
            $filterManagerMock,
            $this->_filesystemMock,
            $viewFileSystemMock,
            $templatePoolMock,
            $appState,
            $this->_storeManagerMock,
            $authorizationMock,
            $backendSessionMock,
            $this->_mathMock,
            $this->_formKey
        );
    }

    protected function _makeMock($className)
    {
        return $this->getMockBuilder($className)->disableOriginalConstructor()->getMock();
    }

    protected function _setStub(
        \PHPUnit_Framework_MockObject_MockObject $object,
        $stubName,
        $return = null,
        $expects = null
    ) {
        $expects = isset($expects) ? $expects : $this->any();
        $return = isset($return) ? $this->returnValue($return) : $this->returnSelf();

        return $object->expects($expects)->method($stubName)->will($return);
    }

    public function translateCallback($args)
    {
        return $args[0]->getText();
    }
}