function testTimberImageInTwigToString()
 {
     $iid = TimberImageTest::get_image_attachment();
     $str = '{{TimberImage(' . $iid . ')}}';
     $compiled = Timber::compile_string($str);
     $this->assertEquals('http://example.org/wp-content/uploads/' . date('Y') . '/' . date('m') . '/arch.jpg', $compiled);
 }