FilterProviderTest.php

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<?php
namespace Magento\Cms\Test\Unit\Model\Template;

class FilterProviderTest extends \PHPUnit\Framework\TestCase
{
    protected $_model;

    protected $_objectManagerMock;

    protected $_filterMock;

    protected function setUp()
    {
        $this->_filterMock = $this->createMock(\Magento\Cms\Model\Template\Filter::class);
        $this->_objectManagerMock = $this->createMock(\Magento\Framework\ObjectManagerInterface::class);
        $this->_objectManagerMock->expects($this->any())->method('get')->will($this->returnValue($this->_filterMock));
        $this->_model = new \Magento\Cms\Model\Template\FilterProvider($this->_objectManagerMock);
    }

    public function testGetBlockFilter()
    {
        $this->assertInstanceOf(\Magento\Cms\Model\Template\Filter::class, $this->_model->getBlockFilter());
    }

    public function testGetPageFilter()
    {
        $this->assertInstanceOf(\Magento\Cms\Model\Template\Filter::class, $this->_model->getPageFilter());
    }

    public function testGetPageFilterInnerCache()
    {
        $this->_objectManagerMock->expects($this->once())->method('get')->will($this->returnValue($this->_filterMock));
        $this->_model->getPageFilter();
        $this->_model->getPageFilter();
    }

    public function testGetPageWrongInstance()
    {
        $someClassMock = $this->createMock('SomeClass');
        $objectManagerMock = $this->createMock(\Magento\Framework\ObjectManagerInterface::class);
        $objectManagerMock->expects($this->once())->method('get')->will($this->returnValue($someClassMock));
        $model = new \Magento\Cms\Model\Template\FilterProvider($objectManagerMock, 'SomeClass', 'SomeClass');
        $model->getPageFilter();
    }
}