Add more nullsafe operators

Author: nicolas-grekas

Tests/Transport/BeanstalkdTransportTest.php

@@ -52,8 +52,8 @@ public function testReceivesMessages()
 
     private function getTransport(SerializerInterface $serializer = null, Connection $connection = null): BeanstalkdTransport
     {
-        $serializer = $serializer ?? $this->createMock(SerializerInterface::class);
-        $connection = $connection ?? $this->createMock(Connection::class);
+        $serializer ??= $this->createMock(SerializerInterface::class);
+        $connection ??= $this->createMock(Connection::class);
 
         return new BeanstalkdTransport($connection, $serializer);
     }

Transport/BeanstalkdTransport.php

@@ -38,48 +38,48 @@ public function __construct(Connection $connection, SerializerInterface $seriali
      */
     public function get(): iterable
     {
-        return ($this->receiver ?? $this->getReceiver())->get();
+        return $this->getReceiver()->get();
     }
 
     /**
      * {@inheritdoc}
      */
     public function ack(Envelope $envelope): void
     {
-        ($this->receiver ?? $this->getReceiver())->ack($envelope);
+        $this->getReceiver()->ack($envelope);
     }
 
     /**
      * {@inheritdoc}
      */
     public function reject(Envelope $envelope): void
     {
-        ($this->receiver ?? $this->getReceiver())->reject($envelope);
+        $this->getReceiver()->reject($envelope);
     }
 
     /**
      * {@inheritdoc}
      */
     public function getMessageCount(): int
     {
-        return ($this->receiver ?? $this->getReceiver())->getMessageCount();
+        return $this->getReceiver()->getMessageCount();
     }
 
     /**
      * {@inheritdoc}
      */
     public function send(Envelope $envelope): Envelope
     {
-        return ($this->sender ?? $this->getSender())->send($envelope);
+        return $this->getSender()->send($envelope);
     }
 
     private function getReceiver(): BeanstalkdReceiver
     {
-        return $this->receiver = new BeanstalkdReceiver($this->connection, $this->serializer);
+        return $this->receiver ??= new BeanstalkdReceiver($this->connection, $this->serializer);
     }
 
     private function getSender(): BeanstalkdSender
     {
-        return $this->sender = new BeanstalkdSender($this->connection, $this->serializer);
+        return $this->sender ??= new BeanstalkdSender($this->connection, $this->serializer);
     }
 }