public function testUpdate()
{
$mockRequest = $this->getMockBuilder(DefaultServiceRequest::class)->setMethods(["post"])->disableOriginalConstructor()->getMock();
$mockRequest->expects($this->once())->method("post")->with($this->equalTo("https://spreadsheets.google.com/feeds/cells/15L06yklgflGRDjnN-VvhGYOoVLCH40DJoW5fFiqSTc5U/od6/private/full"), $this->stringContains("MyVal"))->willReturn("<entry/>");
ServiceRequestFactory::setInstance($mockRequest);
$this->cellEntry->update("MyVal");
}