Merge branch '4.0' into 4.1

* 4.0:
  Alpha-ordering for "use" statements

Author: nicolas-grekas

Tests/Transport/AmqpExt/AmqpExtIntegrationTest.php

@@ -13,10 +13,10 @@
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\Messenger\Envelope;
+use Symfony\Component\Messenger\Tests\Fixtures\DummyMessage;
 use Symfony\Component\Messenger\Transport\AmqpExt\AmqpReceiver;
 use Symfony\Component\Messenger\Transport\AmqpExt\AmqpSender;
 use Symfony\Component\Messenger\Transport\AmqpExt\Connection;
-use Symfony\Component\Messenger\Tests\Fixtures\DummyMessage;
 use Symfony\Component\Messenger\Transport\Serialization\Serializer;
 use Symfony\Component\Process\PhpProcess;
 use Symfony\Component\Process\Process;

Tests/Transport/AmqpExt/AmqpReceiverTest.php

@@ -13,10 +13,10 @@
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\Messenger\Envelope;
+use Symfony\Component\Messenger\Tests\Fixtures\DummyMessage;
 use Symfony\Component\Messenger\Transport\AmqpExt\AmqpReceiver;
 use Symfony\Component\Messenger\Transport\AmqpExt\Connection;
 use Symfony\Component\Messenger\Transport\AmqpExt\Exception\RejectMessageExceptionInterface;
-use Symfony\Component\Messenger\Tests\Fixtures\DummyMessage;
 use Symfony\Component\Messenger\Transport\Serialization\Serializer;
 use Symfony\Component\Serializer as SerializerComponent;
 use Symfony\Component\Serializer\Encoder\JsonEncoder;

Tests/Transport/AmqpExt/AmqpSenderTest.php

@@ -11,11 +11,11 @@
 
 namespace Symfony\Component\Messenger\Tests\Transport\AmqpExt;
 
+use PHPUnit\Framework\TestCase;
 use Symfony\Component\Messenger\Envelope;
+use Symfony\Component\Messenger\Tests\Fixtures\DummyMessage;
 use Symfony\Component\Messenger\Transport\AmqpExt\AmqpSender;
 use Symfony\Component\Messenger\Transport\AmqpExt\Connection;
-use Symfony\Component\Messenger\Tests\Fixtures\DummyMessage;
-use PHPUnit\Framework\TestCase;
 use Symfony\Component\Messenger\Transport\Serialization\EncoderInterface;
 
 /**