public function testMultipleSameVariableValues()
 {
     $vars = array('locale');
     $asset = new FileAsset(__DIR__ . '/../Fixture/messages.{locale}.js', array(), null, null, $vars);
     $coll = new AssetCollection(array($asset), array(), null, $vars);
     $coll->setTargetPath('output.{locale}.js');
     $coll->setValues(array('locale' => 'en'));
     foreach ($coll as $asset) {
         $this->assertEquals('output.{locale}_messages._1.js', $asset->getTargetPath(), 'targetPath must not contain several time the same variable');
     }
 }