Fixed PHP 8.1 deprecation concerning \Countable::count(...) return type.

Author: bartvanhoutte

phpunit.xml.dist

@@ -5,7 +5,8 @@
          xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.3/phpunit.xsd"
          bootstrap="vendor/autoload.php"
          colors="true"
-         cacheResult="false">
+         cacheResult="false"
+         convertDeprecationsToExceptions="true">
     <testsuites>
         <testsuite name="MQ React Test Suite">
             <directory>./tests/</directory>

phpunit.xml.legacy

@@ -4,7 +4,8 @@
 <phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/4.8/phpunit.xsd"
          bootstrap="vendor/autoload.php"
-         colors="true">
+         colors="true"
+         convertDeprecationsToExceptions="true">
     <testsuites>
         <testsuite name="MQ React Test Suite">
             <directory>./tests/</directory>

src/Queue.php

@@ -387,6 +387,7 @@ public function __invoke()
         return $deferred->promise();
     }
 
+    #[\ReturnTypeWillChange]
     public function count()
     {
         return $this->pending + count($this->queue);