### Question:
ChunkUtils { public static void readData(File file, ByteBuffer buf, long offset, long len, VolumeIOStats volumeIOStats) throws StorageContainerException { final Path path = file.toPath(); final long startTime = Time.monotonicNow(); final long bytesRead; try { bytesRead = processFileExclusively(path, () -> { try (FileChannel channel = open(path, READ_OPTIONS, NO_ATTRIBUTES); FileLock ignored = channel.lock(offset, len, true)) { return channel.read(buf, offset); } catch (IOException e) { throw new UncheckedIOException(e); } }); } catch (UncheckedIOException e) { throw wrapInStorageContainerException(e.getCause()); } long endTime = Time.monotonicNow(); volumeIOStats.incReadTime(endTime - startTime); volumeIOStats.incReadOpCount(); volumeIOStats.incReadBytes(bytesRead); LOG.debug("Read {} bytes starting at offset {} from {}", bytesRead, offset, file); validateReadSize(len, bytesRead); buf.flip(); } private  ChunkUtils(); static void writeData(File file, ChunkBuffer data,
      long offset, long len, VolumeIOStats volumeIOStats, boolean sync); static void writeData(FileChannel file, String filename,
      ChunkBuffer data, long offset, long len, VolumeIOStats volumeIOStats
  ); static void readData(File file, ByteBuffer buf,
      long offset, long len, VolumeIOStats volumeIOStats); static boolean validateChunkForOverwrite(File chunkFile,
      ChunkInfo info); static boolean isOverWriteRequested(File chunkFile, ChunkInfo
      chunkInfo); static boolean isOverWritePermitted(ChunkInfo chunkInfo); static void verifyChunkFileExists(File file); static void validateBufferSize(long expected, long actual); static final Set<? extends OpenOption> READ_OPTIONS; static final FileAttribute<?>[] NO_ATTRIBUTES; }### Answer:
@Test public void readMissingFile() throws Exception { int len = 123; int offset = 0; File nonExistentFile = new File("nosuchfile"); ByteBuffer buf = ByteBuffer.allocate(len); VolumeIOStats stats = new VolumeIOStats(); StorageContainerException e = LambdaTestUtils.intercept( StorageContainerException.class, () -> ChunkUtils.readData(nonExistentFile, buf, offset, len, stats)); Assert.assertEquals(UNABLE_TO_FIND_CHUNK, e.getResult()); }