public function setReallySavesToTheSpecifiedDirectory()
{
$this->mockCacheFrontend->expects($this->any())->method('getIdentifier')->will($this->returnValue('UnitTestCache'));
$data = uniqid('some data');
$entryIdentifier = 'SimpleFileBackendTest';
$pathAndFilename = 'vfs://Temporary/Directory/Cache/Data/UnitTestCache/' . $entryIdentifier;
$simpleFileBackend = $this->getSimpleFileBackend();
$simpleFileBackend->set($entryIdentifier, $data);
$this->assertFileExists($pathAndFilename);
$retrievedData = file_get_contents($pathAndFilename);
$this->assertEquals($data, $retrievedData);
}