ExtensionAttributesFactoryTest.php

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<?php
namespace Magento\Framework\Api;

class ExtensionAttributesFactoryTest extends \PHPUnit\Framework\TestCase
{
    private $factory;

    protected function setUp()
    {
        $objectManager = \Magento\TestFramework\Helper\Bootstrap::getObjectManager();

        $this->factory = $objectManager->create(
            \Magento\Framework\Api\ExtensionAttributesFactory::class,
            ['objectManager' => $objectManager]
        );
    }

    public function testCreateThrowExceptionIfInterfaceNotImplemented()
    {
        $this->factory->create(\Magento\Framework\Api\ExtensionAttributesFactoryTest::class);
    }

    public function testCreateThrowExceptionIfInterfaceNotOverridden()
    {
        $this->factory->create(\Magento\TestModuleExtensionAttributes\Model\Data\FakeExtensibleOne::class);
    }

    public function testCreateThrowExceptionIfReturnIsIncorrect()
    {
        $this->factory->create(\Magento\TestModuleExtensionAttributes\Model\Data\FakeExtensibleTwo::class);
    }

    public function testCreate()
    {
        $this->assertInstanceOf(
            \Magento\TestModuleExtensionAttributes\Api\Data\FakeRegionExtension::class,
            $this->factory->create(\Magento\TestModuleExtensionAttributes\Model\Data\FakeRegion::class)
        );
    }

    public function testCreateWithLogicException()
    {
        $this->expectException('LogicException');
        $this->expectExceptionMessage(
            "Class 'Magento\\Framework\\Api\\ExtensionAttributesFactoryTest' must implement an interface, "
            . "which extends from 'Magento\\Framework\\Api\\ExtensibleDataInterface'"
        );
        $this->factory->create(get_class($this));
    }
}