[DI] Dont cache classes with missing parents

Author: nicolas-grekas

Resource/ClassExistenceResource.php

@@ -155,7 +155,7 @@ public static function throwOnRequiredClass($class, \Exception $previous = null)
             throw $previous;
         }
 
-        $e = new \ReflectionException("Class $class not found", 0, $previous);
+        $e = new \ReflectionException(sprintf('Class "%s" not found while loading "%s".', $class, self::$autoloadedClass), 0, $previous);
 
         if (null !== $previous) {
             throw $e;

Tests/Resource/ClassExistenceResourceTest.php

@@ -84,7 +84,7 @@ public function testBadParentWithTimestamp()
     public function testBadParentWithNoTimestamp()
     {
         $this->expectException('ReflectionException');
-        $this->expectExceptionMessage('Class Symfony\Component\Config\Tests\Fixtures\MissingParent not found');
+        $this->expectExceptionMessage('Class "Symfony\Component\Config\Tests\Fixtures\MissingParent" not found while loading "Symfony\Component\Config\Tests\Fixtures\BadParent".');
 
         $res = new ClassExistenceResource(BadParent::class, false);
         $res->isFresh(0);