public function testStoreSameImageTwice()
{
$this->assertTrue($this->driver->store($this->user, $this->imageIdentifier, $this->imageData));
$lastModified1 = $this->driver->getLastModified($this->user, $this->imageIdentifier);
clearstatcache();
sleep(1);
$this->assertTrue($this->driver->store($this->user, $this->imageIdentifier, $this->imageData));
$lastModified2 = $this->driver->getLastModified($this->user, $this->imageIdentifier);
$this->assertTrue($lastModified2 > $lastModified1);
}