public function testCreateCell()
{
$mockCellFeed = $this->getMockBuilder(CellFeed::class)->setMethods(["getPostUrl"])->disableOriginalConstructor()->getMock();
$mockCellFeed->expects($this->any())->method("getPostUrl")->will($this->returnValue("https://spreadsheets.google.com/"));
$actual = $mockCellFeed->createCell(2, 1, "Someone");
$this->assertTrue($actual instanceof CellEntry);
}