diff --git a/composer.json b/composer.json
index 9a84e9494..df2dd6867 100644
--- a/composer.json
+++ b/composer.json
@@ -13,7 +13,7 @@
     "minimum-stability": "dev",
     "require": {
         "php": ">=5.3.3",
-        "doctrine/common": "~2.4.0",
+        "doctrine/common": "~2.4",
         "phpcr/phpcr": "~2.1.1",
         "phpcr/phpcr-implementation": "~2.1.0",
         "phpcr/phpcr-utils": "~1.1",
@@ -21,6 +21,7 @@
     },
     "require-dev": {
         "symfony/yaml": "~2.0",
+        "symfony/phpunit-bridge": "2.7.*@dev",
         "liip/rmt": "~1.1"
     },
     "suggest":{
diff --git a/lib/Doctrine/ODM/PHPCR/Mapping/Driver/YamlDriver.php b/lib/Doctrine/ODM/PHPCR/Mapping/Driver/YamlDriver.php
index 613d4fe68..239e4b111 100644
--- a/lib/Doctrine/ODM/PHPCR/Mapping/Driver/YamlDriver.php
+++ b/lib/Doctrine/ODM/PHPCR/Mapping/Driver/YamlDriver.php
@@ -21,6 +21,7 @@
 
 use Doctrine\Common\Persistence\Mapping\Driver\FileDriver;
 use Doctrine\Common\Persistence\Mapping\ClassMetadata;
+use Doctrine\ODM\PHPCR\Exception\InvalidArgumentException;
 use Doctrine\ODM\PHPCR\Mapping\MappingException;
 use Doctrine\Common\Persistence\Mapping\MappingException as DoctrineMappingException;
 use Symfony\Component\Yaml\Yaml;
@@ -270,7 +271,10 @@ private function addMappingFromReference(ClassMetadata $class, $fieldName, $refe
      */
     protected function loadMappingFile($file)
     {
-        return Yaml::parse($file);
+        if (!is_file($file)) {
+            throw new InvalidArgumentException(sprintf('File "%s" not found', $file));
+        }
+        return Yaml::parse(file_get_contents($file));
     }
 
     /**
diff --git a/tests/bootstrap.php b/tests/bootstrap.php
index fa64fc6d3..ae9ed5c61 100644
--- a/tests/bootstrap.php
+++ b/tests/bootstrap.php
@@ -7,6 +7,14 @@
     throw new RuntimeException('Install dependencies to run test suite.');
 }
 
+$files = array_filter(array(
+    __DIR__.'/../vendor/symfony/symfony/src/Symfony/Bridge/PhpUnit/bootstrap.php',
+    __DIR__.'/../vendor/symfony/phpunit-bridge/bootstrap.php',
+), 'file_exists');
+if ($files) {
+    require_once current($files);
+}
+
 use Doctrine\Common\Annotations\AnnotationRegistry;
 AnnotationRegistry::registerLoader(array($autoload, 'loadClass'));
 AnnotationRegistry::registerFile(__DIR__.'/../lib/Doctrine/ODM/PHPCR/Mapping/Annotations/DoctrineAnnotations.php');