Added a test

Author: javiereguiluz

src/Symfony/Bundle/TwigBundle/Tests/Loader/FilesystemLoaderTest.php

@@ -98,4 +98,21 @@ public function testTwigErrorIfLocatorReturnsFalse()
         $loader = new FilesystemLoader($locator, $parser);
         $loader->getCacheKey('name.format.engine');
     }
+
+    /**
+     * @expectedException \Twig_Error_Loader
+     * @expectedExceptionMessageRegExp /Unable to find template "name\.format\.engine" \(looked into: .*\/Tests\/Loader\/\.\.\/DependencyInjection\/Fixtures\/Resources\/views\)/
+     */
+    public function testTwigErrorIfTemplateDoesNotExist()
+    {
+        $parser = $this->getMock('Symfony\Component\Templating\TemplateNameParserInterface');
+        $locator = $this->getMock('Symfony\Component\Config\FileLocatorInterface');
+
+        $loader = new FilesystemLoader($locator, $parser);
+        $loader->addPath(__DIR__.'/../DependencyInjection/Fixtures/Resources/views');
+
+        $method = new \ReflectionMethod('Symfony\Bundle\TwigBundle\Loader\FilesystemLoader', 'findTemplate');
+        $method->setAccessible(true);
+        $method->invoke($loader, 'name.format.engine');
+    }
 }