[4.x] Add method to customize the response factory class in the slim http psr17 factory

Slim/Factory/Psr17/SlimHttpPsr17Factory.php

@@ -27,4 +27,15 @@ public static function createDecoratedResponseFactory(
     ): ResponseFactoryInterface {
         return new static::$responseFactoryClass($responseFactory, $streamFactory);
     }
+
+    /**
+     * Set the response factory class the method `createDecoratedResponseFactory`
+     * should use.
+     *
+     * @param string $responseFactoryClass
+     */
+    public static function setResponseFactory(string $responseFactoryClass): void
+    {
+        static::$responseFactoryClass = $responseFactoryClass;
+    }
 }

tests/Factory/Psr17/SlimHttpPsr17FactoryTest.php

@@ -0,0 +1,27 @@
+<?php
+/**
+ * Slim Framework (https://slimframework.com)
+ *
+ * @license https://github.com/slimphp/Slim/blob/4.x/LICENSE.md (MIT License)
+ */
+
+namespace Slim\Tests\Factory\Psr17;
+
+use ReflectionProperty;
+use Slim\Factory\Psr17\SlimHttpPsr17Factory;
+use Slim\Tests\TestCase;
+
+class SlimHttpPsr17FactoryTest extends TestCase
+{
+    public function testSetResponseFactory()
+    {
+        SlimHttpPsr17Factory::setResponseFactory('Slim\Http\Factory\AnotherDecoratedResponseFactory');
+        $responseFactoryClassProperty = new ReflectionProperty(SlimHttpPsr17Factory::class, 'responseFactoryClass');
+        $responseFactoryClassProperty->setAccessible(true);
+
+        $this->assertEquals(
+            'Slim\Http\Factory\AnotherDecoratedResponseFactory',
+            $responseFactoryClassProperty->getValue()
+        );
+    }
+}