public function testGetLastValidBlockItem()
{
$block = $this->buildBlock();
$lastValidItem = new Item();
$this->storageGateway->expects($this->once())->method('getLastValidBlockItem')->with($block)->will($this->returnValue($lastValidItem));
$this->pageService->setStorageGateway($this->storageGateway);
// Calling assertion twice to test cache (comes along with storage gateway's getLastValidBlockItem() that should be called only once. See above)
$this->assertSame($lastValidItem, $this->pageService->getLastValidBlockItem($block));
$this->assertSame($lastValidItem, $this->pageService->getLastValidBlockItem($block));
}