bug #37499 [Form] Missing return in loadValuesForChoices method (yceruto)

This PR was merged into the 5.1 branch.

Discussion
----------

[Form] Missing return in loadValuesForChoices method

| Q             | A
| ------------- | ---
| Branch?       | 5.1
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | no
| Tickets       | -
| License       | MIT
| Doc PR        | -

Commits
-------

6075debead Missing return in loadValuesForChoices method

src/Symfony/Component/Form/ChoiceList/Factory/Cache/ChoiceLoader.php

@@ -46,6 +46,6 @@ final class ChoiceLoader extends AbstractStaticOption implements ChoiceLoaderInt
      */
     public function loadValuesForChoices(array $choices, callable $value = null)
     {
-        $this->getOption()->loadValuesForChoices($choices, $value);
+        return $this->getOption()->loadValuesForChoices($choices, $value);
     }
 }

src/Symfony/Component/Form/Tests/ChoiceList/Factory/Cache/ChoiceLoaderTest.php

@@ -0,0 +1,44 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Form\Tests\ChoiceList\Factory\Cache;
+
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\Form\ChoiceList\ArrayChoiceList;
+use Symfony\Component\Form\ChoiceList\Factory\Cache\ChoiceLoader;
+use Symfony\Component\Form\ChoiceList\Loader\CallbackChoiceLoader;
+use Symfony\Component\Form\ChoiceList\Loader\ChoiceLoaderInterface;
+use Symfony\Component\Form\FormTypeInterface;
+
+class ChoiceLoaderTest extends TestCase
+{
+    public function testSameFormTypeUseCachedLoader()
+    {
+        $choices = ['f' => 'foo', 'b' => 'bar', 'z' => 'baz'];
+        $choiceList = new ArrayChoiceList($choices);
+
+        $type = $this->createMock(FormTypeInterface::class);
+        $decorated = new CallbackChoiceLoader(static function () use ($choices) {
+            return $choices;
+        });
+        $loader1 = new ChoiceLoader($type, $decorated);
+        $loader2 = new ChoiceLoader($type, $this->createMock(ChoiceLoaderInterface::class));
+
+        $this->assertEquals($choiceList, $loader1->loadChoiceList());
+        $this->assertEquals($choiceList, $loader2->loadChoiceList());
+
+        $this->assertSame($choices, $loader1->loadChoicesForValues($choices));
+        $this->assertSame($choices, $loader2->loadChoicesForValues($choices));
+
+        $this->assertSame($choices, $loader1->loadValuesForChoices($choices));
+        $this->assertSame($choices, $loader2->loadValuesForChoices($choices));
+    }
+}