Path fileWithEmptyBlock = new Path("/test/test/test4");
fs.create(fileWithEmptyBlock);
NamenodeProtocols nameNodeRpc = cluster.getNameNodeRpc();
String clientName = fs.getClient().getClientName();
// create one empty block
nameNodeRpc.addBlock(fileWithEmptyBlock.toString(), clientName, null, null,
INodeId.GRANDFATHER_INODE_ID, null);
fs.createSnapshot(path, "s2");
fs.rename(new Path("/test/test"), new Path("/test/test-renamed"));
fs.delete(new Path("/test/test-renamed"), true);