@Test
public void testConcatBlocks() {

  INodeFile origFile = createINodeFiles(1, "origfile")[0];
  assertEquals("Number of blocks didn't match", origFile.numBlocks(), 1L);
  INodeFile[] appendFiles =   createINodeFiles(4, "appendfile");
  origFile.concatBlocks(appendFiles);
  assertEquals("Number of blocks didn't match", origFile.numBlocks(), 5L);
}