AbstractFactoryTestCase.php

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

abstract class AbstractFactoryTestCase extends \PHPUnit\Framework\TestCase
{
    protected $objectManager;

    protected $factoryClassName;

    protected $instanceClassName;

    protected $objectManagerMock;

    protected $factory;

    protected function setUp()
    {
        $this->objectManager = new Helper\ObjectManager($this);
        $this->objectManagerMock = $this->getMockBuilder(\Magento\Framework\ObjectManagerInterface::class)
            ->disableOriginalConstructor()
            ->getMock();
        $this->factory = $this->objectManager->getObject(
            $this->factoryClassName,
            ['objectManager' => $this->objectManagerMock]
        );
    }

    public function testCreate()
    {
        $instanceMock = $this->getMockBuilder($this->instanceClassName)
            ->disableOriginalConstructor()
            ->getMock();
        $this->objectManagerMock->expects($this->once())
            ->method('create')
            ->will($this->returnValue($instanceMock));
        $this->assertSame($instanceMock, $this->factory->create());
    }
}