[DI] add tests loading calls with returns-clone

src/Symfony/Component/DependencyInjection/Tests/Fixtures/xml/returns_clone.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" ?>
+<container xmlns="http://symfony.com/schema/dic/services"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://symfony.com/schema/dic/services https://symfony.com/schema/dic/services/services-1.0.xsd">
+
+    <services>
+        <service id="foo">
+            <call method="bar" returns-clone="true" />
+        </service>
+    </services>
+</container>

src/Symfony/Component/DependencyInjection/Tests/Fixtures/yaml/returns_clone.yaml

@@ -0,0 +1,5 @@
+services:
+    foo:
+        calls:
+            - {method: bar, arguments: [1], returns_clone: true}
+            - [bar, [2], true]

src/Symfony/Component/DependencyInjection/Tests/Loader/XmlFileLoaderTest.php

@@ -901,4 +901,13 @@ class XmlFileLoaderTest extends TestCase
 
         $this->assertSame('overridden', $container->get('bar')->quz);
     }
+
+    public function testReturnsClone()
+    {
+        $container = new ContainerBuilder();
+        $loader = new XmlFileLoader($container, new FileLocator(self::$fixturesPath.'/xml'));
+        $loader->load('returns_clone.xml');
+
+        $this->assertSame([['bar', [], true]], $container->getDefinition('foo')->getMethodCalls());
+    }
 }

src/Symfony/Component/DependencyInjection/Tests/Loader/YamlFileLoaderTest.php

@@ -834,4 +834,17 @@ class YamlFileLoaderTest extends TestCase
         $this->assertInstanceOf(TaggedIteratorArgument::class, $iteratorArgument);
         $this->assertNull($iteratorArgument->getIndexAttribute());
     }
+
+    public function testReturnsClone()
+    {
+        $container = new ContainerBuilder();
+        $loader = new YamlFileLoader($container, new FileLocator(self::$fixturesPath.'/yaml'));
+        $loader->load('returns_clone.yaml');
+
+        $expected = [
+            ['bar', [1], true],
+            ['bar', [2], true],
+        ];
+        $this->assertSame($expected, $container->getDefinition('foo')->getMethodCalls());
+    }
 }