function testSetCacheFilename_DestructorSaves()
{
$filename = tempnam('/tmp', 'foo');
// create some cache data.
$cache = new Phlickr_Cache();
$cache->set('a key', 'value');
$cache->saveAs($filename);
unset($cache);
// load the cache and then delete the cache file
$this->api->setCacheFilename($filename);
unlink($filename);
$this->assertFalse(file_exists($filename), 'the file should not exist');
// unsetting the api should call the destructor and writeout the file.
unset($this->api);
$this->assertTrue(file_exists($filename), 'the file should exist');
$cache = Phlickr_Cache::createFrom($filename);
$this->assertType('Phlickr_Cache', $cache);
$this->assertTrue($cache->has('a key'), 'value should exist');
}
