CRUDlexTests\TwigExtensionsTest::testLanguageName PHP Method

    public function testLanguageName()
    {
        $filter = $this->app['twig']->getFilter('languageName');
        $read = call_user_func($filter->getCallable(), 'en');
        $expected = 'English';
        $this->assertSame($expected, $read);
        $expected = 'Deutsch';
        $read = call_user_func($filter->getCallable(), 'de');
        $this->assertSame($read, $expected);
        $read = call_user_func($filter->getCallable(), 'invalid');
        $this->assertNull($read);
    }