public function testExtractEndpoint()
{
$url = 'https://spreadsheets.google.com/feeds/worksheets/tA3TdJ0RIVEem3xQZhG2Ceg/private/full/od8';
$expected = '/feeds/worksheets/tA3TdJ0RIVEem3xQZhG2Ceg/private/full/od8';
$actual = Util::extractEndpoint($url);
$this->assertEquals($expected, $actual);
}