ExchangeFactoryTest.php

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<?php
namespace Magento\Framework\MessageQueue\Test\Unit\Bulk;

class ExchangeFactoryTest extends \PHPUnit\Framework\TestCase
{
    private $connectionTypeResolver;

    private $amqpExchangeFactory;

    private $exchangeFactory;

    protected function setUp()
    {
        $this->connectionTypeResolver = $this
            ->getMockBuilder(\Magento\Framework\MessageQueue\ConnectionTypeResolver::class)
            ->disableOriginalConstructor()->getMock();

        $this->amqpExchangeFactory = $this
            ->getMockBuilder(\Magento\Framework\Amqp\ExchangeFactory::class)
            ->disableOriginalConstructor()
            ->getMock();

        $objectManager = new \Magento\Framework\TestFramework\Unit\Helper\ObjectManager($this);
        $this->exchangeFactory = $objectManager->getObject(
            \Magento\Framework\MessageQueue\Bulk\ExchangeFactory::class,
            [
                'connectionTypeResolver' => $this->connectionTypeResolver,
                'exchangeFactories' => ['amqp' => $this->amqpExchangeFactory],
            ]
        );
    }

    public function testCreate()
    {
        $connectionName = 'amqp';
        $data = ['key1' => 'value1'];
        $this->connectionTypeResolver->expects($this->once())
            ->method('getConnectionType')->with($connectionName)->willReturn($connectionName);
        $exchange = $this
            ->getMockBuilder(\Magento\Framework\Amqp\Bulk\Exchange::class)
            ->disableOriginalConstructor()->getMock();
        $this->amqpExchangeFactory->expects($this->once())
            ->method('create')->with($connectionName, $data)->willReturn($exchange);
        $this->assertEquals($exchange, $this->exchangeFactory->create($connectionName, $data));
    }

    public function testCreateWithUndefinedConnectionType()
    {
        $connectionName = 'db';
        $data = ['key1' => 'value1'];
        $this->connectionTypeResolver->expects($this->once())
            ->method('getConnectionType')->with($connectionName)->willReturn($connectionName);
        $this->amqpExchangeFactory->expects($this->never())->method('create');
        $this->exchangeFactory->create($connectionName, $data);
    }

    public function testCreateWithWrongExchangeType()
    {
        $connectionName = 'amqp';
        $data = ['key1' => 'value1'];
        $this->connectionTypeResolver->expects($this->once())
            ->method('getConnectionType')->with($connectionName)->willReturn($connectionName);
        $exchange = $this
            ->getMockBuilder(\Magento\Framework\Amqp\Exchange::class)
            ->disableOriginalConstructor()->getMock();
        $this->amqpExchangeFactory->expects($this->once())
            ->method('create')->with($connectionName, $data)->willReturn($exchange);
        $this->exchangeFactory->create($connectionName, $data);
    }
}