Added some skipifs to prevent fatal errors on missing extensions.

src/Symfony/Component/Translation/Tests/Dumper/IcuResFileDumperTest.php

@@ -18,6 +18,10 @@ class IcuResFileDumperTest extends \PHPUnit_Framework_TestCase
 {
     public function testDump()
     {
+        if (!extension_loaded('mbstring')) {
+            $this->markTestSkipped('This test requires mbstring to work.');
+        }
+
         $catalogue = new MessageCatalogue('en');
         $catalogue->add(array('foo' => 'bar'));
 

src/Symfony/Component/Translation/Tests/Loader/IcuDatFileLoaderTest.php

@@ -20,6 +20,11 @@ class IcuDatFileLoaderTest extends LocalizedTestCase
         if (!class_exists('Symfony\Component\Config\Loader\Loader')) {
             $this->markTestSkipped('The "Config" component is not available');
         }
+
+        if (!extension_loaded('intl')) {
+            $this->markTestSkipped('This test requires intl extension to work.');
+        }
+
     }
 
     public function testDatEnglishLoad()

src/Symfony/Component/Translation/Tests/Loader/IcuResFileLoaderTest.php

@@ -20,6 +20,11 @@ class IcuResFileLoaderTest extends LocalizedTestCase
         if (!class_exists('Symfony\Component\Config\Loader\Loader')) {
             $this->markTestSkipped('The "Config" component is not available');
         }
+
+        if (!extension_loaded('intl')) {
+            $this->markTestSkipped('This test requires intl extension to work.');
+        }
+
     }
 
     public function testLoad()