public function testExchangePublish()
 {
     $connection = new \AMQPConnection();
     $channel = new \AMQPChannel($connection);
     $exchange = new AmqpExchange($channel);
     $publishRoutingKey = $this->faker->name;
     $exchange->setPublishRoutingKey($publishRoutingKey);
     $this->assertEquals($publishRoutingKey, $exchange->getPublishRoutingKey());
     $exchange->publish('message', null);
     $exchange->publish('message', 'routing key');
 }