Merge branch '4.4' into 5.1

* 4.4:
  [Messenger] Improve error message readability
  fix filename being cleaned up at end of tests

Author: fabpot

Tests/Transport/ConnectionTest.php

@@ -488,7 +488,7 @@ public function testItDelaysTheMessageWithADifferentRoutingKeyAndTTLs()
     public function testObfuscatePasswordInDsn()
     {
         $this->expectException('AMQPException');
-        $this->expectExceptionMessage('Could not connect to the AMQP server. Please verify the provided DSN. ({"host":"localhost","port":5672,"vhost":"\/","login":"user","password":"********"})');
+        $this->expectExceptionMessage('Could not connect to the AMQP server. Please verify the provided DSN. ({"host":"localhost","port":5672,"vhost":"/","login":"user","password":"********"})');
         $factory = new TestAmqpFactory(
             $amqpConnection = $this->createMock(\AMQPConnection::class),
             $amqpChannel = $this->createMock(\AMQPChannel::class),

Transport/Connection.php

@@ -470,7 +470,7 @@ public function channel(): \AMQPChannel
                 $credentials['password'] = '********';
                 unset($credentials['delay']);
 
-                throw new \AMQPException(sprintf('Could not connect to the AMQP server. Please verify the provided DSN. (%s).', json_encode($credentials)), 0, $e);
+                throw new \AMQPException(sprintf('Could not connect to the AMQP server. Please verify the provided DSN. (%s).', json_encode($credentials, \JSON_UNESCAPED_SLASHES)), 0, $e);
             }
             $this->amqpChannel = $this->amqpFactory->createChannel($connection);