add test for removeWww Twig Extension

src/Wallabag/CoreBundle/Tests/Twig/WallabagExtensionTest.php

@@ -0,0 +1,17 @@
+<?php
+
+namespace Wallabag\CoreBundle\Tests\Twig;
+
+use Wallabag\CoreBundle\Twig\WallabagExtension;
+
+class WallabagExtensionTest extends \PHPUnit_Framework_TestCase
+{
+    public function testRemoveWww()
+    {
+        $extension = new WallabagExtension();
+
+        $this->assertEquals("lemonde.fr", $extension->removeWww('www.lemonde.fr'));
+        $this->assertEquals("lemonde.fr", $extension->removeWww('lemonde.fr'));
+        $this->assertEquals("gist.github.com", $extension->removeWww('gist.github.com'));
+    }
+}