RouterTest.php

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<?php
namespace Magento\Robots\Test\Unit\Controller;

class RouterTest extends \PHPUnit\Framework\TestCase
{
    private $actionFactoryMock;

    private $actionListMock;

    private $routeConfigMock;

    private $router;

    protected function setUp()
    {
        $this->actionFactoryMock = $this->getMockBuilder(\Magento\Framework\App\ActionFactory::class)
            ->disableOriginalConstructor()
            ->setMethods(['create'])
            ->getMock();

        $this->actionListMock = $this->getMockBuilder(\Magento\Framework\App\Router\ActionList::class)
            ->disableOriginalConstructor()
            ->getMock();

        $this->routeConfigMock = $this->getMockBuilder(\Magento\Framework\App\Route\ConfigInterface::class)
            ->getMockForAbstractClass();

        $this->router = new \Magento\Robots\Controller\Router(
            $this->actionFactoryMock,
            $this->actionListMock,
            $this->routeConfigMock
        );
    }

    public function testMatchNoRobotsRequested()
    {
        $identifier = 'test';

        $requestMock = $this->getMockBuilder(\Magento\Framework\App\RequestInterface::class)
            ->setMethods(['getPathInfo'])
            ->getMockForAbstractClass();
        $requestMock->expects($this->once())
            ->method('getPathInfo')
            ->willReturn($identifier);

        $this->assertNull($this->router->match($requestMock));
    }

    public function testMatchNoRobotsModules()
    {
        $identifier = 'robots.txt';

        $requestMock = $this->getMockBuilder(\Magento\Framework\App\RequestInterface::class)
            ->setMethods(['getPathInfo'])
            ->getMockForAbstractClass();
        $requestMock->expects($this->once())
            ->method('getPathInfo')
            ->willReturn($identifier);

        $this->routeConfigMock->expects($this->once())
            ->method('getModulesByFrontName')
            ->with('robots')
            ->willReturn([]);

        $this->assertNull($this->router->match($requestMock));
    }

    public function testMatch()
    {
        $identifier = 'robots.txt';
        $moduleName = 'Magento_Robots';
        $actionClassName = \Magento\Robots\Controller\Index\Index::class;

        $requestMock = $this->getMockBuilder(\Magento\Framework\App\RequestInterface::class)
            ->setMethods(['getPathInfo'])
            ->getMockForAbstractClass();
        $requestMock->expects($this->once())
            ->method('getPathInfo')
            ->willReturn($identifier);

        $this->routeConfigMock->expects($this->once())
            ->method('getModulesByFrontName')
            ->with('robots')
            ->willReturn([$moduleName]);

        $this->actionListMock->expects($this->once())
            ->method('get')
            ->with($moduleName, null, 'index', 'index')
            ->willReturn($actionClassName);

        $actionClassMock = $this->getMockBuilder(\Magento\Robots\Controller\Index\Index::class)
            ->disableOriginalConstructor()
            ->getMock();

        $this->actionFactoryMock->expects($this->once())
            ->method('create')
            ->with($actionClassName)
            ->willReturn($actionClassMock);

        $this->assertInstanceOf($actionClassName, $this->router->match($requestMock));
    }
}