// have been stored in s1's deleted list
fileNode = (INodeFile) fsdir.getINode(file.toString());
dirNode = (INodeDirectorySnapshottable) fsdir.getINode(dir.toString());
last = dirNode.getDiffs().getLast();
assertTrue(fileNode.isWithSnapshot());
assertEquals(BLOCKSIZE * 3, fileNode.computeFileSize(last.getSnapshotId()));
// 4. modify file --> append without closing stream --> take snapshot -->
// close stream
hdfs.setReplication(file, (short) (REPLICATION - 1));
out = appendFileWithoutClosing(file, BLOCKSIZE);