public function testFallThroughToConsistentCache() {
$timestamp_item = (object) [
'cid' => ChainedFastBackend::LAST_WRITE_TIMESTAMP_PREFIX . 'cache_foo',
public function testFallThroughToConsistentCache() {
$timestamp_item = (object) [
'cid' => ChainedFastBackend::LAST_WRITE_TIMESTAMP_PREFIX . 'cache_foo',