fix test method name

Previously, the test was never executed because the method name did not
start with the "test" prefix.

Author: xabbuh

Tests/Form/ChoiceList/DoctrineChoiceLoaderTest.php

@@ -296,9 +296,9 @@ public function testLoadChoicesForValuesDoesNotLoadIfEmptyValues()
     /**
      * @group legacy
      */
-    public function legacyTestLoadChoicesForValuesLoadsOnlyChoicesIfValueUseIdReader()
+    public function testLegacyLoadChoicesForValuesLoadsOnlyChoicesIfValueUseIdReader()
     {
-        $this->expectDeprecation('Not defining explicitly the IdReader as value callback when query can be optimized has been deprecated in 5.1. Don\'t pass the IdReader to "Symfony\Bridge\Doctrine\Form\ChoiceList\DoctrineChoiceLoader" or define the choice_value instead.');
+        $this->expectDeprecation('Since symfony/doctrine-bridge 5.1: Not defining explicitly the IdReader as value callback when query can be optimized is deprecated. Don\'t pass the IdReader to "Symfony\Bridge\Doctrine\Form\ChoiceList\DoctrineChoiceLoader" or define the "choice_value" option instead.');
         $loader = new DoctrineChoiceLoader(
             $this->om,
             $this->class,