public function testIsStoredImageExists()
{
$filter = 'thumbnail';
$path = 'Tardis/bigger/in-the-inside/RiverSong.jpg';
$aliasPath = 'Tardis/bigger/in-the-inside/RiverSong_thumbnail.jpg';
$this->variationPathGenerator->expects($this->once())->method('getVariationPath')->with($path, $filter)->willReturn($aliasPath);
$this->ioService->expects($this->once())->method('exists')->with($aliasPath)->will($this->returnValue(true));
$this->assertTrue($this->imageResolver->isStored($path, $filter));
}