ViewFactoryTest.php

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<?php
namespace Magento\Framework\Config\Test\Unit;

class ViewFactoryTest extends \PHPUnit\Framework\TestCase
{
    const AREA = 'frontend';

    protected $model;

    protected $objectManager;

    protected $theme;

    protected $view;

    protected function setUp()
    {
        $this->objectManager = $this->createMock(\Magento\Framework\ObjectManagerInterface::class);
        $this->model = new \Magento\Framework\Config\ViewFactory($this->objectManager);
        $this->theme = $this->createMock(\Magento\Framework\View\Design\ThemeInterface::class);
        $this->view = $this->createMock(\Magento\Framework\Config\View::class);
    }

    public function testCreate()
    {
        $this->objectManager->expects($this->once())
            ->method('create')
            ->with(\Magento\Framework\Config\View::class, [])
            ->willReturn($this->view);
        $this->assertEquals($this->view, $this->model->create());
    }

    public function testCreateWithArguments()
    {
        $design = $this->createMock(\Magento\Theme\Model\View\Design::class);
        $design->expects($this->once())
            ->method('setDesignTheme')
            ->with($this->theme, self::AREA);

        $fileResolver = $this->createMock(\Magento\Framework\Config\FileResolver::class);

        $valueMap = [
            [\Magento\Theme\Model\View\Design::class, [], $design],
            [\Magento\Framework\Config\FileResolver::class, ['designInterface' => $design], $fileResolver],
            [\Magento\Framework\Config\View::class, ['fileResolver' => $fileResolver], $this->view],
        ];
        $this->objectManager->expects($this->exactly(3))
            ->method('create')
            ->willReturnMap($valueMap);

        $this->assertEquals($this->view, $this->model->create($this->getArguments()));
    }

    public function testCreateException()
    {
        $this->model->create(
            [
                'themeModel' => 'wrong theme',
                'area' => self::AREA
            ]
        );
    }

    protected function getArguments()
    {
        return [
            'themeModel' => $this->theme,
            'area'       => self::AREA
        ];
    }
}