### Question:
BlockInputStream extends InputStream implements Seekable { @Override public synchronized int read() throws IOException { byte[] buf = new byte[1]; if (read(buf, 0, 1) == EOF) { return EOF; } return Byte.toUnsignedInt(buf[0]); } BlockInputStream(BlockID blockId, long blockLen, Pipeline pipeline,
      Token<OzoneBlockTokenIdentifier> token, boolean verifyChecksum,
      XceiverClientFactory xceiverClientFctry,
      Function<BlockID, Pipeline> refreshPipelineFunction);  BlockInputStream(BlockID blockId, long blockLen, Pipeline pipeline,
                          Token<OzoneBlockTokenIdentifier> token,
                          boolean verifyChecksum,
                          XceiverClientManager xceiverClientFactory
  ); synchronized void initialize(); synchronized long getRemaining(); @Override synchronized int read(); @Override synchronized int read(byte[] b, int off, int len); @Override synchronized void seek(long pos); @Override synchronized long getPos(); @Override boolean seekToNewSource(long targetPos); @Override synchronized void close(); synchronized void resetPosition(); BlockID getBlockID(); long getLength();  }### Answer:
@Test public void testRead() throws Exception { seekAndVerify(50); byte[] b = new byte[200]; blockStream.read(b, 0, 200); matchWithInputData(b, 50, 200); Assert.assertEquals(250, blockStream.getPos()); Assert.assertEquals(2, blockStream.getChunkIndex()); }
@Test public void testSeekAndRead() throws Exception { seekAndVerify(50); byte[] b1 = new byte[100]; blockStream.read(b1, 0, 100); matchWithInputData(b1, 50, 100); byte[] b2 = new byte[100]; blockStream.read(b2, 0, 100); matchWithInputData(b2, 150, 100); }
@Test public void testRefreshPipelineFunction() throws Exception { BlockID blockID = new BlockID(new ContainerBlockID(1, 1)); createChunkList(5); BlockInputStream blockInputStreamWithRetry = new DummyBlockInputStreamWithRetry(blockID, blockSize, null, null, false, null, chunks, chunkDataMap, isRefreshed); Assert.assertFalse(isRefreshed.get()); seekAndVerify(50); byte[] b = new byte[200]; blockInputStreamWithRetry.read(b, 0, 200); Assert.assertTrue(isRefreshed.get()); }